1 Module Overview 1.1 Features 1.2 Ordering Information 1.3 Applications 2 Pin Definitions 2.1 Pin Layout 2.2 Pin Description 3 Boot Configurations 3.1 Chip Boot Mode Control 3.2 Internal LDO (VDD_SDIO) Voltage Control 3.3 U0TXD Printing Control 3.4 Timing Control of SDIO Slave 3.5 JTAG Signal Source Control 3.6 Chip Power-up and Reset 4 Peripherals 4.1 Peripheral Overview 4.2 Digital Peripherals 4.2.1 General Purpose Input / Output Interface (GPIO) 4.2.2 Serial Peripheral Interface (SPI) 4.2.3 Universal Asynchronous Receiver Transmitter (UART) 4.2.4 I2C Interface 4.2.5 I2S Interface 4.2.6 Remote Control Peripheral 4.2.7 Pulse Counter Controller (PCNT) 4.2.8 LED PWM Controller 4.2.9 Motor Control PWM 4.2.10 SD/SDIO/MMC Host Controller 4.2.11 SDIO/SPI Slave Controller 4.2.12 TWAI Controller 4.2.13 Ethernet MAC Interface 4.3 Analog Peripherals 4.3.1 Analog-to-Digital Converter (ADC) 4.3.2 Digital-to-Analog Converter (DAC) 4.3.3 Touch Sensor 5 Electrical Characteristics 5.1 Absolute Maximum Ratings 5.2 Recommended Operating Conditions 5.3 DC Characteristics (3.3 V, 25 °C) 5.4 Current Consumption Characteristics 5.5 Memory Specifications 6 RF Characteristics 6.1 Wi-Fi Radio 6.1.1 Wi-Fi RF Transmitter (TX) Characteristics 6.1.2 Wi-Fi RF Receiver (RX) Characteristics 6.2 Bluetooth LE Radio 6.2.1 Receiver 6.2.2 Transmitter 7 Module Schematics 8 Peripheral Schematics 9 Module Dimensions 10 PCB Layout Recommendations 10.1 PCB Land Pattern 10.2 Module Placement for PCB Design 11 Product Handling 11.1 Storage Conditions 11.2 Electrostatic Discharge (ESD) 11.3 Reflow Profile 11.4 Ultrasonic Vibration Datasheet Versioning Related Documentation and Resources Revision History ESP32-WROOM-32 Datasheet Version 3.6 www.espressif.com NOT RECOMMENDED FOR NEW DESIGNS (NRND) Not Recommended For New Designs (NRND) 1 Module Overview 1 Module Overview Note: Check the link or the QR code to make sure that you use the latest version of this document: https://espressif.com/documentation/esp32-wroom-32_datasheet_en.pdf 1.1 Features CPU and On-Chip Memory • ESP32-D0WDQ6 embedded, Xtensa dual-core 32-bit LX6 microprocessor, up to 240 MHz • 448 KB ROM • 520 KB SRAM • 8 KB SRAM in RTC Wi-Fi • 802.11b/g/n • Bit rate: 802.11n up to 150 Mbps • A-MPDU and A-MSDU aggregation • 0.4 µs guard interval support • Center frequency range of operating channel: 2412 ~ 2484 MHz Bluetooth ® • Bluetooth V4.2 BR/EDR and Bluetooth LE specification • Class-1, class-2 and class-3 transmitter • AFH • CVSD and SBC Peripherals • Up to 32 GPIOs – 5 strapping GPIOs • SD card, UART, SPI, SDIO, I2C, LED PWM, Motor PWM, I2S, IR, pulse counter, GPIO, capacitive touch sensor, ADC, DAC, TWAI ® (compatible with ISO 11898-1, i.e. CAN Specification 2.0) Integrated Components on Module • 40 MHz crystal oscillator • 4 MB SPI flash Antenna Options • On-board PCB antenna Operating Conditions • Operating voltage/Power supply: 3.0 ~ 3.6 V • Operating ambient temperature: –40 ~ 85 °C Certification • RF certification: See certificates for ESP32-WROOM-32 • Green certification: REACH/RoHS Test • HTOL/HTSL/uHAST/TCT/ESD 1.2 Ordering Information ESP32-WROOM-32 is a powerful, generic Wi-Fi + Bluetooth ® + Bluetooth LE MCU module that targets a wide variety of applications, ranging from low-power sensor networks to the most demanding tasks, such as voice encoding, music streaming and MP3 decoding. Espressif Systems 2 Submit Documentation Feedback ESP32-WROOM-32 Datasheet v3.6 Not Recommended For New Designs (NRND) 1 Module Overview ESP32-WROOM-32 comes with a PCB antenna. The module features a 4 MB external SPI flash. The ordering information for the modules is as follows: Table 1: ESP32-WROOM-32 Ordering Information Ambient Temp. 1 Size 2 Ordering Code Flash 3 (°C) (mm) ESP32-WROOM-32 4 MB –40 ~ 85 18 × 25.5 × 3.1 1 Ambient temperature specifies the recommended temperature range of the environment immediately outside the Espressif module. 2 For details, refer to Section 9 Module Dimensions. 3 For specifications, refer to Section 5.5 Memory Specifications. At the core of this module is the ESP32-D0WDQ6, an Xtensa® 32-bit LX7 CPU that operates at up to 240 MHz. You can power off the CPU and make use of the low-power coprocessor to constantly monitor the peripherals for changes or crossing of thresholds. Note: • For details on the part numbers of the ESP32 family of chips, please refer to the document ESP32 Datasheet. • For chip revision identification, ESP-IDF release that supports a specific chip revision, and other information on chip revisions, please refer to ESP32 Series SoC Errata > Section Chip Revision Identification. 1.3 Applications • Smart Home • Industrial Automation • Health Care • Consumer Electronics • Smart Agriculture • POS Machines • Service Robot • Audio Devices • Generic Low-power IoT Sensor Hubs • Generic Low-power IoT Data Loggers • Cameras for Video Streaming • Speech Recognition • Image Recognition • SDIO Wi-Fi + Bluetooth Networking Card Espressif Systems 3 Submit Documentation Feedback ESP32-WROOM-32 Datasheet v3.6 Not Recommended For New Designs (NRND) Contents Contents 1 Module Overview 2 1.1 Features 2 1.2 Ordering Information 2 1.3 Applications 3 2 Pin Definitions 8 2.1 Pin Layout 8 2.2 Pin Description 8 3 Boot Configurations 11 3.1 Chip Boot Mode Control 12 3.2 Internal LDO (VDD_SDIO) Voltage Control 13 3.3 U0TXD Printing Control 14 3.4 Timing Control of SDIO Slave 14 3.5 JTAG Signal Source Control 14 3.6 Chip Power-up and Reset 14 4 Peripherals 16 4.1 Peripheral Overview 16 4.2 Digital Peripherals 16 4.2.1 General Purpose Input / Output Interface (GPIO) 16 4.2.2 Serial Peripheral Interface (SPI) 16 4.2.3 Universal Asynchronous Receiver Transmitter (UART) 17 4.2.4 I2C Interface 17 4.2.5 I2S Interface 18 4.2.6 Remote Control Peripheral 18 4.2.7 Pulse Counter Controller (PCNT) 19 4.2.8 LED PWM Controller 19 4.2.9 Motor Control PWM 20 4.2.10 SD/SDIO/MMC Host Controller 21 4.2.11 SDIO/SPI Slave Controller 21 4.2.12 TWAI ® Controller 22 4.2.13 Ethernet MAC Interface 23 4.3 Analog Peripherals 23 4.3.1 Analog-to-Digital Converter (ADC) 23 4.3.2 Digital-to-Analog Converter (DAC) 24 4.3.3 Touch Sensor 25 5 Electrical Characteristics 26 5.1 Absolute Maximum Ratings 26 5.2 Recommended Operating Conditions 26 5.3 DC Characteristics (3.3 V, 25 °C) 26 5.4 Current Consumption Characteristics 27 Espressif Systems 4 Submit Documentation Feedback ESP32-WROOM-32 Datasheet v3.6 Not Recommended For New Designs (NRND) Contents 5.5 Memory Specifications 27 6 RF Characteristics 28 6.1 Wi-Fi Radio 28 6.1.1 Wi-Fi RF Transmitter (TX) Characteristics 28 6.1.2 Wi-Fi RF Receiver (RX) Characteristics 29 6.2 Bluetooth LE Radio 30 6.2.1 Receiver 30 6.2.2 Transmitter 31 7 Module Schematics 33 8 Peripheral Schematics 34 9 Module Dimensions 35 10 PCB Layout Recommendations 36 10.1 PCB Land Pattern 36 10.2 Module Placement for PCB Design 37 11 Product Handling 38 11.1 Storage Conditions 38 11.2 Electrostatic Discharge (ESD) 38 11.3 Reflow Profile 38 11.4 Ultrasonic Vibration 39 Datasheet Versioning 40 Related Documentation and Resources 41 Revision History 42 Espressif Systems 5 Submit Documentation Feedback ESP32-WROOM-32 Datasheet v3.6 Not Recommended For New Designs (NRND) List of Tables List of Tables 1 ESP32-WROOM-32 Ordering Information 3 2 Pin Definitions 9 3 Default Configuration of Strapping Pins 11 4 Description of Timing Parameters for the Strapping Pins 12 5 Chip Boot Mode Control 12 6 U0TXD Printing Control 14 7 Timing Control of SDIO Slave 14 8 Description of Timing Parameters for Power-up and Reset 15 9 ADC Characteristics 24 10 ADC Calibration Results 24 11 Capacitive-Sensing GPIOs Available on ESP32 25 12 Absolute Maximum Ratings 26 13 Recommended Operating Conditions 26 14 DC Characteristics (3.3 V, 25 °C) 26 15 Flash Specifications 27 16 Wi-Fi RF Characteristics 28 17 TX Power with Spectral Mask and EVM Meeting 802.11 Standards 28 18 TX EVM Test 1 28 19 RX Sensitivity 29 20 Maximum RX Level 30 21 RX Adjacent Channel Rejection 30 22 Receiver Characteristics – Bluetooth LE 30 23 Transmitter Characteristics – Bluetooth LE 31 Espressif Systems 6 Submit Documentation Feedback ESP32-WROOM-32 Datasheet v3.6 Not Recommended For New Designs (NRND) List of Figures List of Figures 1 ESP32-WROOM-32 Pin Layout (Top View) 8 2 Visualization of Timing Parameters for the Strapping Pins 12 3 Chip Boot Flow 13 4 Visualization of Timing Parameters for Power-up and Reset 14 5 ESP32-WROOM-32 Schematics 33 6 ESP32-WROOM-32 Peripheral Schematics 34 7 Physical Dimensions 35 8 Recommended PCB Land Pattern 36 9 Reflow Profile 38 Espressif Systems 7 Submit Documentation Feedback ESP32-WROOM-32 Datasheet v3.6 Not Recommended For New Designs (NRND) 2 Pin Definitions 2 Pin Definitions 2.1 Pin Layout The pin diagram below shows the approximate location of pins on the module. For the actual diagram drawn to scale, please refer to Figure 9 Module Dimensions. Keepout Zone GND IO23 IO22 TXD0 RXD0 IO21 NC IO19 IO18 IO5 IO17 IO16 IO4 IO0 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 IO2 IO15 SD1 SD0 CLK CMD SD3 SD2 IO13 GND 1 2 3 4 5 6 7 8 9 10 11 12 13 14 GND 3V3 EN SENSOR_VP SENSOR_VN IO34 IO35 IO32 IO33 IO25 IO26 IO27 IO14 IO12 39 GND Figure 1: ESP32-WROOM-32 Pin Layout (Top View) 2.2 Pin Description ESP32-WROOM-32 has 38 pins. See pin definitions in Table 2. For peripheral pin configurations, please refer to Section 4.2 Digital Peripherals. Espressif Systems 8 Submit Documentation Feedback ESP32-WROOM-32 Datasheet v3.6 Not Recommended For New Designs (NRND) 2 Pin Definitions Table 2: Pin Definitions Name No. Type 1 Function GND 1 P Ground 3V3 2 P Power supply EN 3 I Module-enable signal. Active high. SENSOR_VP 4 I GPIO36, ADC1_CH0, RTC_GPIO0 SEN- SOR_VN 5 I GPIO39, ADC1_CH3, RTC_GPIO3 IO34 6 I GPIO34, ADC1_CH6, RTC_GPIO4 IO35 7 I GPIO35, ADC1_CH7, RTC_GPIO5 IO32 8 I/O GPIO32, XTAL_32K_P (32.768 kHz crystal oscillator input), ADC1_CH4, TOUCH9, RTC_GPIO9 IO33 9 I/O GPIO33, XTAL_32K_N (32.768 kHz crystal oscillator output), ADC1_CH5, TOUCH8, RTC_GPIO8 IO25 10 I/O GPIO25, DAC_1, ADC2_CH8, RTC_GPIO6, EMAC_RXD0 IO26 11 I/O GPIO26, DAC_2, ADC2_CH9, RTC_GPIO7, EMAC_RXD1 IO27 12 I/O GPIO27, ADC2_CH7, TOUCH7, RTC_GPIO17, EMAC_RX_DV IO14 13 I/O GPIO14, ADC2_CH6, TOUCH6, RTC_GPIO16, MTMS, HSPICLK, HS2_CLK, SD_CLK, EMAC_TXD2 IO12 14 I/O GPIO12, ADC2_CH5, TOUCH5, RTC_GPIO15, MTDI, HSPIQ, HS2_DATA2, SD_DATA2, EMAC_TXD3 GND 15 P Ground IO13 16 I/O GPIO13, ADC2_CH4, TOUCH4, RTC_GPIO14, MTCK, HSPID, HS2_DATA3, SD_DATA3, EMAC_RX_ER SHD/SD2 2 17 I/O GPIO9, SD_DATA2, SPIHD, HS1_DATA2, U1RXD SWP/SD3 2 18 I/O GPIO10, SD_DATA3, SPIWP, HS1_DATA3, U1TXD SCS/CMD 2 19 I/O GPIO11, SD_CMD, SPICS0, HS1_CMD, U1RTS SCK/CLK 2 20 I/O GPIO6, SD_CLK, SPICLK, HS1_CLK, U1CTS SDO/SD0 2 21 I/O GPIO7, SD_DATA0, SPIQ, HS1_DATA0, U2RTS SDI/SD1 2 22 I/O GPIO8, SD_DATA1, SPID, HS1_DATA1, U2CTS IO15 23 I/O GPIO15, ADC2_CH3, TOUCH3, MTDO, HSPICS0, RTC_GPIO13, HS2_CMD, SD_CMD, EMAC_RXD3 IO2 24 I/O GPIO2, ADC2_CH2, TOUCH2, RTC_GPIO12, HSPIWP, HS2_DATA0, SD_DATA0 IO0 25 I/O GPIO0, ADC2_CH1, TOUCH1, RTC_GPIO11, CLK_OUT1, EMAC_TX_CLK IO4 26 I/O GPIO4, ADC2_CH0, TOUCH0, RTC_GPIO10, HSPIHD, HS2_DATA1, SD_DATA1, EMAC_TX_ER IO16 27 I/O GPIO16, HS1_DATA4, U2RXD, EMAC_CLK_OUT IO17 28 I/O GPIO17, HS1_DATA5, U2TXD, EMAC_CLK_OUT_180 IO5 29 I/O GPIO5, VSPICS0, HS1_DATA6, EMAC_RX_CLK IO18 30 I/O GPIO18, VSPICLK, HS1_DATA7 IO19 31 I/O GPIO19, VSPIQ, U0CTS, EMAC_TXD0 NC 32 - - IO21 33 I/O GPIO21, VSPIHD, EMAC_TX_EN Espressif Systems 9 Submit Documentation Feedback ESP32-WROOM-32 Datasheet v3.6 Not Recommended For New Designs (NRND) 2 Pin Definitions Name No. Type 1 Function RXD0 34 I/O GPIO3, U0RXD, CLK_OUT2 TXD0 35 I/O GPIO1, U0TXD, CLK_OUT3, EMAC_RXD2 IO22 36 I/O GPIO22, VSPIWP, U0RTS, EMAC_TXD1 IO23 37 I/O GPIO23, VSPID, HS1_STROBE GND 38 P Ground 1 P: power supply; I: input; O: output. 2 Pins SCK/CLK, SDO/SD0, SDI/SD1, SHD/SD2, SWP/SD3 and SCS/CMD, namely, GPIO6 to GPIO11 on the ESP32-D0WDQ6 chip are connected to the SPI flash integrated on the module and are not recommended for other uses. Espressif Systems 10 Submit Documentation Feedback ESP32-WROOM-32 Datasheet v3.6 Not Recommended For New Designs (NRND) 3 Boot Configurations 3 Boot Configurations Note: The content below is excerpted from ESP32 Series Datasheet > Section Boot Configurations. For the strapping pin map- ping between the chip and modules, please refer to Chapter 7 Module Schematics. The chip allows for configuring the following boot parameters through strapping pins and eFuse bits at power-up or a hardware reset, without microcontroller interaction. • Chip boot mode – Strapping pin: GPIO0 and GPIO2 • Internal LDO (VDD_SDIO) Voltage – Strapping pin: MTDI – eFuse bit: EFUSE_SDIO_FORCE and EFUSE_SDIO_TIEH • U0TXD printing – Strapping pin: MTDO • Timing of SDIO Slave – Strapping pin: MTDO and GPIO5 • JTAG signal source – eFuse bit: EFUSE_DISABLE_JTAG The default values of all the above eFuse bits are 0, which means that they are not burnt. Given that eFuse is one-time programmable, once an eFuse bit is programmed to 1, it can never be reverted to 0. For how to program eFuse bits, please refer to ESP32 Technical Reference Manual > Chapter eFuse Controller. The default values of the strapping pins, namely the logic levels, are determined by pins’ internal weak pull-up/pull-down resistors at reset if the pins are not connected to any circuit, or connected to an external high-impedance circuit. Table 3: Default Configuration of Strapping Pins Strapping Pin Default Configuration Bit Value GPIO0 Pull-up 1 GPIO2 Pull-down 0 MTDI Pull-down 0 MTDO Pull-up 1 GPIO5 Pull-up 1 To change the bit values, the strapping pins should be connected to external pull-down/pull-up resistances. If the ESP32 is used as a device by a host MCU, the strapping pin voltage levels can also be controlled by the host MCU. All strapping pins have latches. At system reset, the latches sample the bit values of their respective strapping pins and store them until the chip is powered down or shut down. The states of latches cannot be changed in any other way. It makes the strapping pin values available during the entire chip operation, and the pins are freed up to be used as regular IO pins after reset. Espressif Systems 11 Submit Documentation Feedback ESP32-WROOM-32 Datasheet v3.6 Not Recommended For New Designs (NRND) 3 Boot Configurations The timing of signals connected to the strapping pins should adhere to the setup time and hold time specifications in Table 4 and Figure 2. Table 4: Description of Timing Parameters for the Strapping Pins Parameter Description Min (ms) t SU Setup time is the time reserved for the power rails to stabilize before the CHIP_PU pin is pulled high to activate the chip. 0 t H Hold time is the time reserved for the chip to read the strapping pin values after CHIP_PU is already high and before these pins start operating as regular IO pins. 1 Strapping pin VIL_nRST VIH t SU t H CHIP_PU Figure 2: Visualization of Timing Parameters for the Strapping Pins 3.1 Chip Boot Mode Control GPIO0 and GPIO2 control the boot mode after the reset is released. See Table 5 Chip Boot Mode Control. Table 5: Chip Boot Mode Control Boot Mode GPIO0 GPIO2 SPI Boot Mode 1 Any value Joint Download Boot Mode 2 0 0 1 Bold marks the default value and configuration. 2 Joint Download Boot mode supports the following download methods: • SDIO Download Boot • UART Download Boot In Joint Download Boot mode, the detailed boot flow of the chip is put below 3. Espressif Systems 12 Submit Documentation Feedback ESP32-WROOM-32 Datasheet v3.6 Not Recommended For New Designs (NRND) 3 Boot Configurations Figure 3: Chip Boot Flow uart_download_dis controls boot mode behaviors: It permanently disables Download Boot mode when uart_download_dis is set to 1 (valid only for ESP32 chip revisions v3.0 and higher). 3.2 Internal LDO (VDD_SDIO) Voltage Control MTDI is used to select the VDD_SDIO power supply voltage at reset: • MTDI = 0 (by default), VDD_SDIO pin is powered directly from VDD3P3_RTC. Typically this voltage is 3.3 V. For more information, see ESP32 Series Datasheet > Section Power Scheme. • MTDI = 1, VDD_SDIO pin is powered from internal 1.8 V LDO. This functionality can be overridden by setting EFUSE_SDIO_FORCE to 1, in which case the EFUSE_SDIO_TIEH determines the VDD_SDIO voltage: • EFUSE_SDIO_TIEH = 0, VDD_SDIO connects to 1.8 V LDO. • EFUSE_SPI_TIEH = 1, VDD_SDIO connects to VDD3P3_RTC. Espressif Systems 13 Submit Documentation Feedback ESP32-WROOM-32 Datasheet v3.6 Not Recommended For New Designs (NRND) 3 Boot Configurations 3.3 U0TXD Printing Control During booting, the strapping pin MTDO can be used to control the U0TXD Printing, as Table 6 shows. Table 6: U0TXD Printing Control U0TXD Printing Control MTDO Enabled 1 1 Disabled 0 1 Bold marks the default value and configuration. 3.4 Timing Control of SDIO Slave The strapping pin MTDO and GPIO5 can be used to control the timing of SDIO slave, see Table 7 Timing Control of SDIO Slave. Table 7: Timing Control of SDIO Slave Edge behavior MTDO GPIO5 Falling edge sampling, falling edge output 0 0 Falling edge sampling, rising edge output 0 1 Rising edge sampling, falling edge output 1 0 Rising edge sampling, rising edge output 1 1 1 Bold marks the default value and configuration. 3.5 JTAG Signal Source Control If EFUSE_DISABLE_JTAG is set to 1, the source of JTAG signals can be disabled. 3.6 Chip Power-up and Reset Once the power is supplied to the chip, its power rails need a short time to stabilize. After that, CHIP_PU – the pin used for power-up and reset – is pulled high to activate the chip. For information on CHIP_PU as well as power-up and reset timing, see Figure 4 and Table 8. V IL_nRST t ST BL t RST VDD3P3_RTC Min VDD CHIP_PU Figure 4: Visualization of Timing Parameters for Power-up and Reset Espressif Systems 14 Submit Documentation Feedback ESP32-WROOM-32 Datasheet v3.6 Not Recommended For New Designs (NRND) 3 Boot Configurations Table 8: Description of Timing Parameters for Power-up and Reset Parameter Description Min (µs) t ST BL Time reserved for the 3.3 V rails to stabilize before the CHIP_PU pin is pulled high to activate the chip 50 t RST Time reserved for CHIP_PU to stay below V IL_nRST to reset the chip (see Table 14) 50 For details, please refer to ESP32 Series Datasheet > Section Chip Power-up and Reset. Espressif Systems 15 Submit Documentation Feedback ESP32-WROOM-32 Datasheet v3.6 Not Recommended For New Designs (NRND) 4 Peripherals 4 Peripherals 4.1 Peripheral Overview ESP32-D0WDQ6 chip integrates a rich set of peripherals including SPI, I2S, UART, I2C, pulse count controller, TWAI ® , ADC, DAC, touch sensor, etc. To learn more about on-chip components, please refer to ESP32 Series Datasheet > Section Functional Description. Note: • The content below is sourced from ESP32 Series Datasheet > Section Functional Description. Some information may not be applicable to ESP32-WROOM-32 as not all the IO signals are exposed on the module. • To learn more about peripheral signals, please refer to ESP32 Technical Reference Manual > Section Peripheral Signal List. 4.2 Digital Peripherals 4.2.1 General Purpose Input / Output Interface (GPIO) ESP32 has 34 GPIO pins which can be assigned various functions by programming the appropriate registers. There are several kinds of GPIOs: digital-only, analog-enabled, capacitive-touch-enabled, etc. Analog-enabled GPIOs and Capacitive-touch-enabled GPIOs can be configured as digital GPIOs. Most of the digital GPIOs can be configured as internal pull-up or pull-down, or set to high impedance. When configured as an input, the input value can be read through the register. The input can also be set to edge-trigger or level-trigger to generate CPU interrupts. Most of the digital IO pins are bi-directional, non-inverting and tristate, including input and output buffers with tristate control. These pins can be multiplexed with other functions, such as the SDIO, UART, SPI, etc. (More details can be found in ESP32 Series Datasheet > Appendix, Table IO_MUX. ) For low-power operations, the GPIOs can be set to hold their states. For details, see ESP32 Series Datasheet > Section Peripheral Pin Configurations, ESP32 Series Datasheet > Appendix A – ESP32 Pin Lists and ESP32 Technical Reference Manual > Chapter IO_MUX and GPIO Matrix. 4.2.2 Serial Peripheral Interface (SPI) ESP32 integrates four SPI controllers which can be used to communicate with external devices that use the SPI protocol. Controller SPI0 is used as a buffer for accessing external memory. Controller SPI1 can be used as a master. Controllers SPI2 and SPI3 can be configured as either a master or a slave. SPI1, SPI2, and SPI3 use signal buses prefixed with SPI, HSPI, and VSPI, respectively. Features of General Purpose SPI (GP-SPI) • Programmable data transfer length, in multiples of 1 byte • Four-line full-duplex/half-duplex communication and three-line half-duplex communication support • Master mode and slave mode Espressif Systems 16 Submit Documentation Feedback ESP32-WROOM-32 Datasheet v3.6 Not Recommended For New Designs (NRND) 4 Peripherals • Programmable CPOL and CPHA • Programmable clock For details, see ESP32 Technical Reference Manual > Chapter SPI Controller. Pin Assignment For SPI, the pins are multiplexed with GPIO6 ~ GPIO11 via the IO MUX. For HSPI, the pins are multiplexed with GPIO2, GPIO4, GPIO12 ~ GPIO15 via the IO MUX. For VSPI, the pins are multiplexed with GPIO5, GPIO18 ~ GPIO19, GPIO21 ~ GPIO23 via the IO MUX. For more information about the pin assignment, see ESP32 Series Datasheet > Section Peripheral Pin Configurations and ESP32 Technical Reference Manual > Chapter IO_MUX and GPIO Matrix. 4.2.3 Universal Asynchronous Receiver Transmitter (UART) The UART in the ESP32 chip facilitates the transmission and reception of asynchronous serial data between the chip and external UART devices. It consists of two UARTs in the main system, and one low-power LP UART. Feature List • Programmable baud rate • RAM shared by TX FIFOs and RX FIFOs • Supports input baud rate self-check • Support for various lengths of data bits and stop bits • Parity bit support • Asynchronous communication (RS232 and RS485) and IrDA support • Supports DMA to communicate data in high speed • Supports UART wake-up • Supports both software and hardware flow control For details, see ESP32 Technical Reference Manual > Chapter UART Controller. Pin Assignment The pins for UART can be chosen from any GPIOs via the GPIO Matrix. For more information about the pin assignment, see ESP32 Series Datasheet > Section Peripheral Pin Configurations and ESP32 Technical Reference Manual > Chapter IO_MUX and GPIO Matrix. 4.2.4 I2C Interface ESP32 has two I2C bus interfaces which can serve as I2C master or slave, depending on the user’s configuration. Espressif Systems 17 Submit Documentation Feedback ESP32-WROOM-32 Datasheet v3.6 Not Recommended For New Designs (NRND) 4 Peripherals Feature List • Two I2C controllers: one in the main system and one in the low-power system • Standard mode (100 Kbit/s) • Fast mode (400 Kbit/s) • Up to 5 MHz, yet constrained by SDA pull-up strength • Support for 7-bit and 10-bit addressing, as well as dual address mode • Supports continuous data transmission with disabled Serial Clock Line (SCL) • Supports programmable digital noise filter Users can program command registers to control I2C interfaces, so that they have more flexibility. For details, see ESP32 Technical Reference Manual > Chapter I2C Controller. Pin Assignment For regular I2C, the pins used can be chosen from any GPIOs via the GPIO Matrix. For more information about the pin assignment, see ESP32 Series Datasheet > Section Peripheral Pin Configurations and ESP32 Technical Reference Manual > Chapter IO_MUX and GPIO Matrix. 4.2.5 I2S Interface The I2S Controller in the ESP32 chip provides a flexible communication interface for streaming digital data in multimedia applications, particularly digital audio applications. Feature List • Master mode and slave mode • Full-duplex and half-duplex communications • A variety of audio standards supported • Configurable high-precision output clock • Supports PDM signal input and output • Configurable data transmit and receive modes For details, see ESP32 Technical Reference Manual > Chapter I2S Controller. Pin Assignment The pins for the I2S Controller can be chosen from any GPIOs via the GPIO Matrix. For more information about the pin assignment, see ESP32 Series Datasheet > Section Peripheral Pin Configurations and ESP32 Technical Reference Manual > Chapter IO_MUX and GPIO Matrix. 4.2.6 Remote Control Peripheral The Remote Control Peripheral (RMT) controls the transmission and reception of infrared remote control signals. Espressif Systems 18 Submit Documentation Feedback ESP32-WROOM-32 Datasheet v3.6 Not Recommended For New Designs (NRND) 4 Peripherals Feature List • Eight channels for sending and receiving infrared remote control signals • Independent transmission and reception capabilities for each channel • Clock divider counter, state machine, and receiver for each RX channel • Supports various infrared protocols For details, see ESP32 Technical Reference Manual > Chapter Remote Control Peripheral. Pin Assignment The pins for the Remote Control Peripheral can be chosen from any GPIOs via the GPIO Matrix. For more information about the pin assignment, see ESP32 Series Datasheet > Section Peripheral Pin Configurations and ESP32 Technical Reference Manual > Chapter IO_MUX and GPIO Matrix. 4.2.7 Pulse Counter Controller (PCNT) The pulse counter controller (PCNT) is designed to count input pulses by tracking rising and falling edges of the input pulse signal. Feature List • Eight independent pulse counter units • Each pulse counter unit has a 16-bit signed counter register and two channels • Counter modes: increment, decrement, or disable • Glitch filtering for input pulse signals and control signals • Selection between counting on rising or falling edges of the input pulse signal For details, see ESP32 Technical Reference Manual > Chapter Pulse Count Controller. Pin Assignment The pins for the Pulse Count Controller can be chosen from any GPIOs via the GPIO Matrix. For more information about the pin assignment, see ESP32 Series Datasheet > Section Peripheral Pin Configurations and ESP32 Technical Reference Manual > Chapter IO_MUX and GPIO Matrix. 4.2.8 LED PWM Controller The LED PWM Controller (LEDC) is designed to generate PWM signals for LED control. Feature List • Sixteen independent PWM generators • Maximum PWM duty cycle resolution of 20 bits • Eight independent timers with 20-bit counters, configurable fractional clock dividers and counter overflow values Espressif Systems 19 Submit Documentation Feedback ESP32-WROOM-32 Datasheet v3.6 Not Recommended For New Designs (NRND) 4 Peripherals • Adjustable phase of PWM signal output • PWM duty cycle dithering • Automatic duty cycle fading For details, see ESP32 Technical Reference Manual > Chapter LED PWM Controller. Pin Assignment The pins for the LED PWM Controller can be chosen from any GPIOs via the GPIO Matrix. For more information about the pin assignment, see ESP32 Series Datasheet > Section Peripheral Pin Configurations and ESP32 Technical Reference Manual > Chapter IO_MUX and GPIO Matrix. 4.2.9 Motor Control PWM The Pulse Width Modulation (PWM) controller can be used for driving digital motors and smart lights. The controller consists of PWM timers, the PWM operator and a dedicated capture sub-module. Each timer provides timing in synchronous or independent form, and each PWM operator generates a waveform for one PWM channel. The dedicated capture sub-module can accurately capture events with external timing. Feature List • Three PWM timers for precise timing and frequency control – Every PWM timer has a dedicated 8-bit clock prescaler – The 16-bit counter in the PWM timer can work in count-up mode, count-down mode, or count-up-down mode – A hardware sync can trigger a reload on the PWM timer with a phase register. It will also trigger the prescaler’ restart, so that the timer’s clock can also be synced, with selectable hardware synchronization source • Three PWM operators for generating waveform pairs – Six PWM outputs to operate in several topologies – Configurable dead time on rising and falling edges; each set up independently – Modulating of PWM output by high-frequency carrier signals, useful when gate drivers are insulated with a transformer • Fault Detection module – Programmable fault handling in both cycle-by-cycle mode and one-shot mode – A fault condition can force the PWM output to either high or low logic levels • Capture module for hardware-based signal processing – Speed measurement of rotating machinery – Measurement of elapsed time between position sensor pulses – Period and duty cycle measurement of pulse train signals Espressif Systems 20 Submit Documentation Feedback ESP32-WROOM-32 Datasheet v3.6 Not Recommended For New Designs (NRND) 4 Peripherals – Decoding current or voltage amplitude derived from duty-cycle-encoded signals of current/voltage sensors – Three individual capture channels, each of which with a 32-bit time-stamp register – Selection of edge polarity and prescaling of input capture signals – The capture timer can sync with a PWM timer or external signals For details, see ESP32 Technical Reference Manual > Chapter Motor Control PWM. Pin Assignment The pins for the Motor Control PWM can be chosen from any GPIOs via the GPIO Matrix. For more information about the pin assignment, see ESP32 Series Datasheet > Section Peripheral Pin Configurations and ESP32 Technical Reference Manual > Chapter IO_MUX and GPIO Matrix. 4.2.10 SD/SDIO/MMC Host Controller An SD/SDIO/MMC host controller is available on ESP32. Feature List • Supports two external cards • Supports SD Memory Card standard: version 3.0 and version 3.01) • Supports SDIO Version 3.0 • Supports Consumer Electronics Advanced Transport Architecture (CE-ATA Version 1.1) • Supports Multimedia Cards (MMC version 4.41, eMMC version 4.5 and version 4.51) The controller allows up to 80 MHz clock output in three different data-bus modes: 1-bit, 4-bit, and 8-bit modes. It supports two SD/SDIO/MMC4.41 cards in a 4-bit data-bus mode. It also supports one SD card operating at 1.8 V. For details, see ESP32 Technical Reference Manual > Chapter SD/MMC Host Controller. Pin Assignment The pins for SD/SDIO/MMC Host Controller are multiplexed with GPIO2, GPIO4, GPIO6 ~ GPIO15 via IO MUX. For more information about the pin assignment, see ESP32 Series Datasheet > Section Peripheral Pin Configurations and ESP32 Technical Reference Manual > Chapter IO_MUX and GPIO Matrix. 4.2.11 SDIO/SPI Slave Controller ESP32 integrates an SD device interface that conforms to the industry-standard SDIO Card Specification Version 2.0, and allows a host controller to access the SoC, using the SDIO bus interface and protocol. ESP32 acts as the slave on the SDIO bus. The host can access the SDIO-interface registers directly and can access shared memory via a DMA engine, thus maximizing performance without engaging the processor cores. Espressif Systems 21 Submit Documentation Feedback ESP32-WROOM-32 Datasheet v3.6 Not Recommended For New Designs (NRND) 4 Peripherals Feature List The SDIO/SPI slave controller supports the following features: • SPI, 1-bit SDIO, and 4-bit SDIO transfer modes over the full clock range from 0 to 50 MHz • Configurable sampling and driving clock edge • Special registers for direct access by host • Interrupts to host for initiating data transfer • Automatic loading of SDIO bus data and automatic discarding of padding data • Block size of up to 512 bytes • Interrupt vectors between the host and the slave, allowing both to interrupt each other • Supports DMA for data transfer For details, see ESP32 Technical Reference Manual > Chapter SDIO Slave Controller. Pin Assignment The pins for SDIO/SPI Slave Controller are multiplexed with GPIO2, GPIO4, GPIO6 ~ GPIO15 via IO MUX. For more information about the pin assignment, see ESP32 Series Datasheet > Section Peripheral Pin Configurations and ESP32 Technical Reference Manual > Chapter IO_MUX and GPIO Matrix. 4.2.12 TWAI ® Controller The Two-wire Automotive Interface (TWAI ® ) is a multi-master, multi-cast communication protocol designed for automotive applications. The TWAI controller facilitates the communication based on this protocol. Feature List • Compatible with ISO 11898-1 protocol (CAN Specification 2.0) • Standard frame format (11-bit ID) and extended frame format (29-bit ID) • Bit rates: – From 25 Kbit/s to 1 Mbit/s in chip revision v0.0/v1.0/v1.1 – From 12.5 Kbit/s to 1 Mbit/s in chip revision v3.0/v3.1 • Multiple modes of operation: Normal, Listen Only, and Self-Test • 64-byte receive FIFO • Special transmissions: single-shot transmissions and self reception • Acceptance filter (single and dual filter modes) • Error detection and handling: error counters, configurable error interrupt threshold, error code capture, arbitration lost capture For details, see ESP32 Technical Reference Manual > Chapter Two-wire Automotive Interface (TWAI). Espressif Systems 22 Submit Documentation Feedback ESP32-WROOM-32 Datasheet v3.6 Not Recommended For New Designs (NRND) 4 Peripherals Pin Assignment The pins for the Two-wire Automotive Interface can be chosen from any GPIOs via the GPIO Matrix. For more information about the pin assignment, see ESP32 Series Datasheet > Section Peripheral Pin Configurations and ESP32 Technical Reference Manual > Chapter IO_MUX and GPIO Matrix. 4.2.13 Ethernet MAC Interface An IEEE-802.3-2008-compliant Media Access Controller (MAC) is provided for Ethernet LAN communications. ESP32 requires an external physical interface device (PHY) to connect to the physical LAN bus (twisted-pair, fiber, etc.). The PHY is connected to ESP32 through 17 signals of MII or nine signals of RMII. Feature List • 10 Mbps and 100 Mbps rates • Dedicated DMA controller allowing high-speed transfer between the dedicated SRAM and Ethernet MAC • Tagged MAC frame (VLAN support) • Half-duplex (CSMA/CD) and full-duplex operation • MAC control sublayer (control frames) • 32-bit CRC generation and removal • Several address-filtering modes for physical and multicast address (multicast and group addresses) • 32-bit status code for each transmitted or received frame • Internal FIFOs to buffer transmit and receive frames. The transmit FIFO and the receive FIFO are both 512 words (32-bit) • Hardware PTP (Precision Time Protocol) in accordance with IEEE 1588 2008 (PTP V2) • 25 MHz/50 MHz clock output For details, see ESP32 Technical Reference Manual > Chapter Ethernet Media Access Controller (MAC). Pin Assignment For information about the pin assignment of Ethernet MAC Interface, see ESP32 Series Datasheet > Section Peripheral Pin Configurations and ESP32 Technical Reference Manual > Chapter IO_MUX and GPIO Matrix. 4.3 Analog Peripherals 4.3.1 Analog-to-Digital Converter (ADC) ESP32 integrates two 12-bit SAR ADCs and supports measurements on 18 channels (analog-enabled pins). The ULP coprocessor in ESP32 is also designed to measure voltage, while operating in the sleep mode, which enables low-power consumption. The CPU can be woken up by a threshold setting and/or via other triggers. Table 9 describes the ADC characteristics. Espressif Systems 23 Submit Documentation Feedback ESP32-WROOM-32 Datasheet v3.6 Not Recommended For New Designs (NRND) 4 Peripherals Table 9: ADC Characteristics Parameter Description Min Max Unit DNL (Differential nonlinearity) RTC controller; ADC connected to an –7 7 LSB external 100 nF capacitor; DC signal input; INL (Integral nonlinearity) ambient temperature at 25 °C; –12 12 LSB Wi-Fi&Bluetooth off Sampling rate RTC controller — 200 ksps DIG controller — 2 Msps Notes: • When atten = 3 and the measurement result is above 3000 (voltage at approx. 2450 mV), the ADC accuracy will be worse than described in the table above. • To get better DNL results, users can take multiple sampling tests with a filter, or calculate the average value. • The input voltage range of GPIO pins within VDD3P3_RTC domain should strictly follow the DC characteristics provided in Table 14. Otherwise, measurement errors may be introduced, and chip performance may be affected. By default, there are ±6% differences in measured results between chips. ESP-IDF provides couple of calibration methods for ADC1. Results after calibration using eFuse Vref value are shown in Table 10. For higher accuracy, users may apply other calibration methods provided in ESP-IDF, or implement their own. Table 10: ADC Calibration Results Parameter Description Min Max Unit Total error Atten = 0, effective measurement range of 100 ∼ 950 mV –23 23 mV Atten = 1, effective measurement range of 100 ∼ 1250 mV –30 30 mV Atten = 2, effective measurement range of 150 ∼ 1750 mV –40 40 mV Atten = 3, effective measurement range of 150 ∼ 2450 mV –60 60 mV For details, see ESP32 Technical Reference Manual > Chapter On-Chip Sensors and Analog Signal Processing. Pin Assignment With appropriate settings, the ADCs can be configured to measure voltage on 18 pins maximum. For detailed information about the pin assignment, see ESP32 Series Datasheet > Section Peripheral Pin Configurations and ESP32 Technical Reference Manual > Chapter IO_MUX and GPIO Matrix. 4.3.2 Digital-to-Analog Converter (DAC) Two 8-bit DAC channels can be used to convert two digital signals into two analog voltage signal outputs. The design structure is composed of integrated resistor strings and a buffer. This dual DAC supports power supply as input voltage reference. The two DAC channels can also support independent conversions. For details, see ESP32 Technical Reference Manual > Chapter On-Chip Sensors and Analog Signal Processing. Espressif Systems 24 Submit Documentation Feedback ESP32-WROOM-32 Datasheet v3.6 Not Recommended For New Designs (NRND) 4 Peripherals Pin Assignment The DAC can be configured by GPIO 25 and GPIO 26. For detailed information about the pin assignment, see ESP32 Series Datasheet > Section Peripheral Pin Configurations and ESP32 Technical Reference Manual > Chapter IO_MUX and GPIO Matrix. 4.3.3 Touch Sensor ESP32 has 10 capacitive-sensing GPIOs, which detect variations induced by touching or approaching the GPIOs with a finger or other objects. The low-noise nature of the design and the high sensitivity of the circuit allow relatively small pads to be used. Arrays of pads can also be used, so that a larger area or more points can be detected. Pin Assignment The 10 capacitive-sensing GPIOs are listed in Table 11. Table 11: Capacitive-Sensing GPIOs Available on ESP32 Capacitive-Sensing Signal Name Pin Name T0 GPIO4 T1 GPIO0 T2 GPIO2 T3 MTDO T4 MTCK T5 MTDI T6 MTMS T7 GPIO27 T8 32K_XN T9 32K_XP For details, see ESP32 Technical Reference Manual > Chapter On-Chip Sensors and Analog Signal Processing. Note: ESP32 Touch Sensor has not passed the Conducted Susceptibility (CS) test for now, and thus has limited application scenarios. Espressif Systems 25 Submit Documentation Feedback ESP32-WROOM-32 Datasheet v3.6 Not Recommended For New Designs (NRND) 5 Electrical Characteristics 5 Electrical Characteristics 5.1 Absolute Maximum Ratings Stresses beyond the absolute maximum ratings listed in Table 12 Absolute Maximum Ratings below may cause permanent damage to the device. These are stress ratings only, and do not refer to the functional operation of the device that should follow the Table 13 Recommended Operating Conditions. Table 12: Absolute Maximum Ratings Symbol Parameter Min Max Unit VDD33 Power supply voltage –0.3 3.6 V I output 1 Cumulative IO output current - 1,100 mA T store Storage temperature –40 105 °C 1. The module worked properly after a 24-hour test in ambient temperature at 25 °C, and the IOs in three domains (VDD3P3_RTC, VDD3P3_CPU, VDD_SDIO) output high logic level to ground. Please note that pins occupied by flash and/or PSRAM in the VDD_SDIO power domain were excluded from the test. 2. Please see Appendix IO_MUX of ESP32 Datasheet for IO’s power domain. 5.2 Recommended Operating Conditions Table 13: Recommended Operating Conditions Symbol Parameter Min Typical Max Unit VDD33 Power supply voltage 3.0 3.3 3.6 V I V DD Current delivered by external power supply 0.5 - - A T Operating ambient temperature –40 - 85 °C 5.3 DC Characteristics (3.3 V, 25 °C) Table 14: DC Characteristics (3.3 V, 25 °C) Symbol Parameter Min Typ Max Unit C IN Pin capacitance - 2 - pF V IH High-level input voltage 0.75×VDD 1 - VDD 1 +0.3 V V IL Low-level input voltage –0.3 - 0.25×VDD 1 V I IH High-level input current - - 50 nA I IL Low-level input current - - 50 nA V OH High-level output voltage 0.8×VDD 1 - - V V OL Low-level output voltage - - 0.1×VDD 1 V I OH High-level source current VDD3P3_CPU power domain 1, 2 - 40 - mA (VDD 1 = 3.3 V, V OH >= 2.64 V, VDD3P3_RTC power domain 1, 2 - 40 - mA output drive strength set to the maximum) VDD_SDIO power domain 1, 3 - 20 - mA Espressif Systems 26 Submit Documentation Feedback ESP32-WROOM-32 Datasheet v3.6 Not Recommended For New Designs (NRND) 5 Electrical Characteristics Symbol Parameter Min Typ Max Unit I OL Low-level sink current (VDD 1 = 3.3 V, V OL = 0.495 V, output drive strength set to the maximum) - 28 - mA R P U Resistance of internal pull-up resistor - 45 - kΩ R P D Resistance of internal pull-down resistor - 45 - kΩ V IL_nRST Low-level input voltage of CHIP_PU to shut down the chip - - 0.6 V Notes: 1. Please see Appendix IO_MUX of ESP32 Datasheet for IO’s power domain. VDD is the I/O voltage for a particular power domain of pins. 2. For VDD3P3_CPU and VDD3P3_RTC power domain, per-pin current sourced in the same domain is gradually reduced from around 40 mA to around 29 mA, V OH >=2.64 V, as the number of current-source pins increases. 3. Pins occupied by flash and/or PSRAM in the VDD_SDIO power domain were excluded from the test. 5.4 Current Consumption Characteristics Owing to the use of advanced power-management technologies, the module can switch between different power modes. For details on different power modes, please refer to Section RTC and Low-Power Management in ESP32 Series Datasheet. 5.5 Memory Specifications The data below is sourced from the memory vendor datasheet. These values are guaranteed through design and/or characterization but are not fully tested in production. Devices are shipped with the memory erased. Table 15: Flash Specifications Parameter Description Min Typ Max Unit VCC Power supply voltage (1.8 V) 1.65 1.80 2.00 V Power supply voltage (3.3 V) 2.7 3.3 3.6 V F C Maximum clock frequency 80 — — MHz — Program/erase cycles 100,000 — — cycles T RET Data retention time 20 — — years T P P Page program time — 0.8 5 ms T SE Sector erase time (4 KB) — 70 500 ms T BE1 Block erase time (32 KB) — 0.2 2 s T BE2 Block erase time (64 KB) — 0.3 3 s T CE Chip erase time (16 Mb) — 7 20 s Chip erase time (32 Mb) — 20 60 s Chip erase time (64 Mb) — 25 100 s Chip erase time (128 Mb) — 60 200 s Chip erase time (256 Mb) — 70 300 s Espressif Systems 27 Submit Documentation Feedback ESP32-WROOM-32 Datasheet v3.6 Not Recommended For New Designs (NRND) 6 RF Characteristics 6 RF Characteristics This section contains tables with RF characteristics of the Espressif product. The RF data is measured at the antenna port, where RF cable is connected, including the front-end loss. Devices should operate in the center frequency range allocated by regional regulatory authorities. The target center frequency range and the target transmit power are configurable by software. See ESP RF Test Tool and Test Guide for instructions. Unless otherwise stated, the RF tests are conducted with a 3.3 V (±5%) supply at 25 ºC ambient temperature. 6.1 Wi-Fi Radio Table 16: Wi-Fi RF Characteristics Name Description Center frequency range of operating channel 2412 ~ 2484 MHz Wi-Fi wireless standard IEEE 802.11b/g/n 6.1.1 Wi-Fi RF Transmitter (TX) Characteristics Table 17: TX Power with Spectral Mask and EVM Meeting 802.11 Standards Min Typ Max Rate (dBm) (dBm) (dBm) 802.11b, 1 Mbps — 19.5 — 802.11b, 11 Mbps — 19.5 — 802.11g, 6 Mbps — 18.0 — 802.11g, 54 Mbps — 14.0 — 802.11n, HT20, MCS0 — 18.0 — 802.11n, HT20, MCS7 — 13.0 — 802.11n, HT40, MCS0 — 18.0 — 802.11n, HT40, MCS7 — 13.0 — Table 18: TX EVM Test 1 Min Typ Limit Rate (dB) (dB) (dB) 802.11b, 1 Mbps, DSSS — –25.0 –10.0 802.11b, 11 Mbps, CCK — –25.0 –10.0 802.11g, 6 Mbps, OFDM — –24.0 –5.0 802.11g, 54 Mbps, OFDM — –28.0 –25.0 802.11n, HT20, MCS0 — –24.0 –5.0 802.11n, HT20, MCS7 — –30.0 –27.0 Cont’d on next page Espressif Systems 28 Submit Documentation Feedback ESP32-WROOM-32 Datasheet v3.6 Not Recommended For New Designs (NRND) 6 RF Characteristics Table 18 – cont’d from previous page Min Typ Limit Rate (dB) (dB) (dB) 802.11n, HT40, MCS0 — –24.0 –5.0 802.11n, HT40, MCS7 — –30.0 –27.0 1 EVM is measured at the corresponding typical TX power provided in Table 17 Wi-Fi RF Transmitter (TX) Characteristics above. 6.1.2 Wi-Fi RF Receiver (RX) Characteristics For RX tests, the PER (packet error rate) limit is 8% for 802.11b, and 10% for 802.11g/n. Table 19: RX Sensitivity Min Typ Max Rate (dBm) (dBm) (dBm) 802.11b, 1 Mbps, DSSS — –97.0 — 802.11b, 2 Mbps, DSSS — –94.0 — 802.11b, 5.5 Mbps, CCK — –91.0 — 802.11b, 11 Mbps, CCK — –88.0 — 802.11g, 6 Mbps, OFDM — –93.0 — 802.11g, 9 Mbps, OFDM — –91.0 — 802.11g, 12 Mbps, OFDM — –90.0 — 802.11g, 18 Mbps, OFDM — –87.0 — 802.11g, 24 Mbps, OFDM — –84.0 — 802.11g, 36 Mbps, OFDM — –81.0 — 802.11g, 48 Mbps, OFDM — –77.0 — 802.11g, 54 Mbps, OFDM — –75.0 — 802.11n, HT20, MCS0 — –91.0 — 802.11n, HT20, MCS1 — –88.0 — 802.11n, HT20, MCS2 — –86.0 — 802.11n, HT20, MCS3 — -83.0 — 802.11n, HT20, MCS4 — –80.0 — 802.11n, HT20, MCS5 — –75.0 — 802.11n, HT20, MCS6 — –73.0 — 802.11n, HT20, MCS7 — –72.0 — 802.11n, HT40, MCS0 — –88.0 — 802.11n, HT40, MCS1 — –85.0 — 802.11n, HT40, MCS2 — –83.0 — 802.11n, HT40, MCS3 — –80.0 — 802.11n, HT40, MCS4 — –76.0 — 802.11n, HT40, MCS5 — –72.0 — 802.11n, HT40, MCS6 — –70.0 — 802.11n, HT40, MCS7 — –69.0 — Espressif Systems 29 Submit Documentation Feedback ESP32-WROOM-32 Datasheet v3.6 Not Recommended For New Designs (NRND) 6 RF Characteristics Table 20: Maximum RX Level Min Typ Max Rate (dBm) (dBm) (dBm) 802.11b, 1 Mbps — 5 — 802.11b, 11 Mbps — 5 — 802.11g, 6 Mbps — 0 — 802.11g, 54 Mbps — –8 — 802.11n, HT20, MCS0 — 0 — 802.11n, HT20, MCS7 — –8 — 802.11n, HT40, MCS0 — 0 — 802.11n, HT40, MCS7 — –8 — Table 21: RX Adjacent Channel Rejection Min Typ Max Rate (dB) (dB) (dB) 802.11b, 1 Mbps, DSSS — 35 — 802.11b, 11 Mbps, CCK — 35 — 802.11g, 6 Mbps, OFDM — 27 — 802.11g, 54 Mbps, OFDM — 13 — 802.11n, HT20, MCS0 — 27 — 802.11n, HT20, MCS7 — 12 — 802.11n, HT40, MCS0 — 16 — 802.11n, HT40, MCS7 — 7 — 6.2 Bluetooth LE Radio 6.2.1 Receiver Table 22: Receiver Characteristics – Bluetooth LE Parameter Condition Min Typ Max Unit Sensitivity @30.8% PER - - –97 - dBm Maximum received signal @30.8% PER - 0 - - dBm Co-channel C/I - - +10 - dB Adjacent channel selectivity C/I F = F0 + 1 MHz - –5 - dB F = F0 – 1 MHz - –5 - dB F = F0 + 2 MHz - –25 - dB F = F0 – 2 MHz - –35 - dB F = F0 + 3 MHz - –25 - dB F = F0 – 3 MHz - –45 - dB Out-of-band blocking performance 30 MHz ~ 2000 MHz –10 - - dBm 2000 MHz ~ 2400 MHz –27 - - dBm 2500 MHz ~ 3000 MHz –27 - - dBm Espressif Systems 30 Submit Documentation Feedback ESP32-WROOM-32 Datasheet v3.6 Not Recommended For New Designs (NRND) 6 RF Characteristics Parameter Condition Min Typ Max Unit 3000 MHz ~ 12.5 GHz –10 - - dBm Intermodulation - –36 - - dBm 6.2.2 Transmitter Table 23: Transmitter Characteristics – Bluetooth LE Parameter Condition Min Typ Max Unit RF transmit power - - 0 - dBm Gain control step - - 3 - dBm RF power control range - –12 - +9 dBm Adjacent channel transmit power F = F0 ± 2 MHz - –52 - dBm F = F0 ± 3 MHz - –58 - dBm F = F0 ± > 3 MHz - –60 - dBm ∆ f1 avg - - - 265 kHz ∆ f2 max - 247 - - kHz ∆ f2 avg /∆ f1 avg - - –0.92 - - ICFT - - –10 - kHz Drift rate - - 0.7 - kHz/50 µs Drift - - 2 - kHz Espressif Systems 31 Submit Documentation Feedback ESP32-WROOM-32 Datasheet v3.6 Not Recommended For New Designs (NRND) 6 RF Characteristics This is the reference design of the module. Espressif Systems 32 Submit Documentation Feedback ESP32-WROOM-32 Datasheet v3.6 Not Recommended For New Designs (NRND) 7 Module Schematics 7 Module Schematics SDI/SD1 SDO/SD0 SCK/CLK SCS/CMD SWP/SD3 SHD/SD2 CHIP_PU GPIO35 SCK/CLK SCS/CMD SHD/SD2 SWP/SD3 SDI/SD1 SDO/SD0 GPIO34 GPIO25 GPIO26 GPIO27 GPIO14 GPIO12 GPIO15 GPIO13 GPIO2 GPIO0 GPIO5 GPIO18 GPIO17 GPIO4 SENSOR_VP SENSOR_VN U0RXD GPIO22 GPIO23 GPIO21 GPIO19 U0TXD GPIO16GPIO32 SENSOR_VP SENSOR_VN GPIO32 GPIO33 GPIO18 U0TXD U0RXD GPIO22 GPIO21 GPIO19 GPIO23 CHIP_PU GPIO34 GPIO35 GPIO25 GPIO26 GPIO27 GPIO14 GPIO12 GPIO0 GPIO4 GPIO16 GPIO5 GPIO17 GPIO13 SHD/SD2 SWP/SD3 SCS/CMD SCK/CLK SDO/SD0 SDI/SD1 GPIO15 GPIO2 GPIO33 GND GND GND GND GND VDD33 GND GND GND VDD_SDIO GND GND VDD33 GND GND GND GNDGND GND GND GND VDD33 GND GND VDD33 GNDGND GND GND VDD33 VDD33 VDD_SDIO Pin.39 GND Pin.1 GND Pin.15 GND Pin.38 GND Pin.2 3V3 Pin.3 CHIP_PU/EN Pin.4 SENSOR_VP Pin.5 SENSOR_VN Pin.6 IO34 Pin.7 IO35 Pin.8 IO32 Pin.9 IO33 Pin.10 IO25 Pin.11 IO26 Pin.12 IO27 Pin.13 IO14 Pin.14 IO12 Pin.16 IO13 Pin.17 SD2 Pin.18 SD3 Pin.19 CMD Pin.20 CLK Pin.21 SD0 Pin.22 SD1 Pin.23 IO15 Pin.24 IO2 Pin.25 IO0 Pin.26 IO4 Pin.27 IO16 Pin.28 IO17 Pin.29 IO5 Pin.30 IO18 Pin.31 IO19 Pin.32 NC Pin.33 IO21 Pin.34 RXD0 Pin.35 TXD0 Pin.36 IO22 Pin.37 IO23 The values of C14, L4 and C15 vary with the actual selection of a PCB board. The values of C1 and C2 vary with the selection of a crystal. C13 10uF U1 40MHz+/-10ppm XIN 1 GND 2 XOUT 3 GND 4 C4 0.1uF C15 TBD C1 22pF C11 1uF R1 20K(5%) C10 0.1uF C14 TBD U3 FLASH /CS 1 DO 2 /WP 3 GND 4 DI 5 CLK 6 /HOLD 7 VCC 8 D1 ESD3.3V88D-C C19 0.1uF C2 22pF C20 1uF ANT1 PCB ANT 1 2 C5 10nF/6.3V(10%) C12 10uF C18 1uF C3 100pF C17 270pF C16 270pF C9 0.1uF U2ESP32-D0WDQ6 VDDA 1 LNA_IN 2 VDD3P3 3 VDD3P3 4 SENSOR_VP 5 SENSOR_CAPP 6 SENSOR_CAPN 7 SENSOR_VN 8 CHIP_PU 9 VDET_1 10 VDET_2 11 32K_XP 12 32K_XN 13 GPIO25 14 GPIO26 15 GPIO27 16 MTMS 17 MTDI 18 VDD3P3_RTC 19 MTCK 20 MTDO 21 GPIO2 22 GPIO0 23 GPIO4 24 VDD_SDIO 26 GPIO16 25 GPIO17 27 SD_DATA_2 28 SD_DATA_3 29 SD_CMD 30 SD_CLK 31 SD_DATA_0 32 GND 49 SD_DATA_1 33 GPIO5 34 GPIO18 35 GPIO19 38 CAP2 47 VDDA 43 XTAL_N 44 XTAL_P 45 GPIO23 36 U0TXD 41 GPIO22 39 GPIO21 42 VDD3P3_CPU 37 CAP1 48 VDDA 46 U0RXD 40 L4 TBD C6 3.3nF/6.3V(10%) Figure 5: ESP32-WROOM-32 Schematics Espressif Systems 33 Submit Documentation Feedback ESP32-WROOM-32 Datasheet v3.6 Not Recommended For New Designs (NRND) 8 Peripheral Schematics 8 Peripheral Schematics This is the typical application circuit of the module connected with peripheral components (for example, power supply, antenna, reset button, JTAG interface, and UART interface). 5 5 4 4 3 3 2 2 1 1 D D C C B B A A Espressif Systems MTDI should be kept at a low electric level when powering up the module. EN TXD RXD IO0 MTMS MTDI MTCK MTDO IO23 IO22 IO21 IO19 IO18 IO5 IO4 IO2 SD2 SD3 CMD CLK SD0 SD1 SENSOR_VP SENSOR_VN IO34 IO35 IO32 IO33 IO25 IO26 IO27 IO17 IO16 VDD33 GND VDD33 GND GND GND GND GND GND Title Size Document Number R e v Date: Sheet o f 1.0 Application of ESP32-WROOM-32 A4 1 1Wednesday, August 07, 2019 Title Size Document Number R e v Date: Sheet o f 1.0 Application of ESP32-WROOM-32 A4 1 1Wednesday, August 07, 2019 Title Size Document Number R e v Date: Sheet o f 1.0 Application of ESP32-WROOM-32 A4 1 1Wednesday, August 07, 2019 R2 100R R4 100R C1 10uF U2 JTAG MTMS 1 MTDI 2 MTCK 3 MTDO 4 U1 GND1 1 3V3 2 EN 3 SENSOR_VP 4 SENSOR_VN 5 IO34 6 IO35 7 IO32 8 IO33 9 IO25 10 IO26 11 IO27 12 IO14 13 IO12 14 GND3 38 IO23 37 IO22 36 TXD0 35 RXD0 34 IO21 33 NC 32 IO19 31 IO18 30 IO5 29 IO17 28 IO16 27 IO4 26 IO0 25 GND2 15 IO13 16 SD2 17 SD3 18 CMD 19 CLK 20 SD0 21 SD1 22 IO15 23 IO2 24 P_GND 39 R1 TBD C3 TBD J1 UART DOWNLOAD 1 2 3 R3 100R R5 100R C2 0.1uF J2 BOOT OPTION 1 2 Figure 6: ESP32-WROOM-32 Peripheral Schematics • Soldering Pad 39 to the ground of the base board is not a must. If you choose to solder it, please apply the correct amount of soldering paste. Too much soldering paste may increase the gap between the module and the baseboard. As a result, the adhesion between other pins and the baseboard may be poor. • To ensure the power supply to the ESP32 chip during power-up, it is advised to add an RC delay circuit at the EN pin. The recommended setting for the RC delay circuit is usually R = 10 kΩ and C = 1 µF. However, specific parameters should be adjusted based on the power-up timing of the module and the power-up and reset sequence timing of the chip. For ESP32’s power-up and reset sequence timing diagram, please refer to Section 3.6 Chip Power-up and Reset. • UART0 is used to download firmware and log output. When using the AT firmware, note that the UART GPIO is already configured. It is recommended to use the default configuration. Please refer to ESP-AT User Guide for ESP32 > Section Hardware Connection. Espressif Systems 34 Submit Documentation Feedback ESP32-WROOM-32 Datasheet v3.6 Not Recommended For New Designs (NRND) 9 Module Dimensions 9 Module Dimensions 18.00±0.15 0.85 0.90 9.68 ESP32-WROOM-32 Dimensions 3.10±0.15 0.80 Top View Side View Bottom View 0.90 0.85 0.1 Unit: mm 4.10 4.10 25.50±0.15 11.43 8.89 1.50 1.27 16.51 15.80 17.60 0.90 0.45 1.05 5.94 Ø1.00 5.94 10.67 Figure 7: Physical Dimensions Note: For information about tape, reel, and product marking, please refer to ESP32 Module Packaging Information. Espressif Systems 35 Submit Documentation Feedback ESP32-WROOM-32 Datasheet v3.6 Not Recommended For New Designs (NRND) 10 PCB Layout Recommendations 10 PCB Layout Recommendations 10.1 PCB Land Pattern This section provides the following resources for your reference: • Figures for recommended PCB land patterns with all the dimensions needed for PCB design. See Figure 10.1 PCB Land Pattern. • Source files of recommended PCB land patterns to measure dimensions not covered in Figure 10.1. You can view the source files for ESP32-WROOM-32 with Autodesk Viewer. Unit: mm Copper Via for thermal pad Antenna Area 1 14 15 24 25 38 18.00 25.50 38x1.50 38x0.90 0.50 1.50 1.27 1.27 3.28 1.50 0.50 1.05 0.475 4.10 1.05 0.475 4.10 8.32 10.67 16.51 5.94 11.43 Figure 8: Recommended PCB Land Pattern Espressif Systems 36 Submit Documentation Feedback ESP32-WROOM-32 Datasheet v3.6 Not Recommended For New Designs (NRND) 10 PCB Layout Recommendations 10.2 Module Placement for PCB Design If module-on-board design is adopted, attention should be paid while positioning the module on the base board. The interference of the base board on the module’s antenna performance should be minimized. For details about module placement for PCB design, please refer to ESP32 Hardware Design Guidelines > Section General Principles of PCB Layout for Modules. Espressif Systems 37 Submit Documentation Feedback ESP32-WROOM-32 Datasheet v3.6 Not Recommended For New Designs (NRND) 11 Product Handling 11 Product Handling 11.1 Storage Conditions The products sealed in moisture barrier bags (MBB) should be stored in a non-condensing atmospheric environment of < 40 °C and 90%RH. The module is rated at the moisture sensitivity level (MSL) of 3. After unpacking, the module must be soldered within 168 hours with the factory conditions 25 ± 5 °C and 60 %RH. If the above conditions are not met, the module needs to be baked. 11.2 Electrostatic Discharge (ESD) • Human body model (HBM): ±2000 V • Charged-device model (CDM): ±500 V 11.3 Reflow Profile Solder the module in a single reflow. 50 150 0 25 1 ~ 3 ℃/s 0 200 250 200 –1 ~ –5 ℃/s Cooling zone 100 217 50 100 250 Reflow zone 217 ℃ 60 ~ 90 s Temperature (℃) Preheating zone 150 ~ 200 ℃ 60 ~ 120 s Ramp-up zone Peak Temp. 235 ~ 250 ℃ Soldering time > 30 s Time (sec.) Ramp-up zone — Temp.: 25 ~ 150 ℃ Time: 60 ~ 90 s Ramp-up rate: 1 ~ 3 ℃/s Preheating zone — Temp.: 150 ~ 200 ℃ Time: 60 ~ 120 s Reflow zone — Temp.: >217 ℃ 60 ~ 90 s; Peak Temp.: 235 ~ 250 ℃ Time: 30 ~ 70 s Cooling zone — Peak Temp. ~ 180 ℃ Ramp-down rate: –1 ~ –5 ℃/s Solder — Sn-Ag-Cu (SAC305) lead-free solder alloy Figure 9: Reflow Profile Espressif Systems 38 Submit Documentation Feedback ESP32-WROOM-32 Datasheet v3.6 Not Recommended For New Designs (NRND) 11 Product Handling 11.4 Ultrasonic Vibration Avoid exposing Espressif modules to vibration from ultrasonic equipment, such as ultrasonic welders or ultrasonic cleaners. This vibration may induce resonance in the in-module crystal and lead to its malfunction or even failure. As a consequence, the module may stop working or its performance may deteriorate. Espressif Systems 39 Submit Documentation Feedback ESP32-WROOM-32 Datasheet v3.6 Not Recommended For New Designs (NRND) Datasheet Versioning Datasheet Versioning Datasheet Version Status Watermark Definition v0.1 ~ v0.5 (excluding v0.5) Draft Confidential This datasheet is under development for products in the design stage. Specifications may change without prior notice. v0.5 ~ v1.0 (excluding v1.0) Preliminary release Preliminary This datasheet is actively updated for products in the verification stage. Specifications may change before mass production, and the changes will be documentation in the datasheet’s Revision History. v1.0 and higher Official release — This datasheet is publicly released for products in mass production. Specifications are finalized, and major changes will be communicated via Product Change Notifications (PCN). Any version — Not Recommended for New Design (NRND) 1 This datasheet is updated less frequently for products not recommended for new designs. Any version — End of Life (EOL) 2 This datasheet is no longer mtained for products that have reached end of life. 1 Watermark will be added to the datasheet title page only when all the product variants covered by this datasheet are not recommended for new designs. 2 Watermark will be added to the datasheet title page only when all the product variants covered by this datasheet have reached end of life. Espressif Systems 40 Submit Documentation Feedback ESP32-WROOM-32 Datasheet v3.6 Not Recommended For New Designs (NRND) Related Documentation and Resources Related Documentation and Resources Related Documentation • ESP32 Series Datasheet – Specifications of the ESP32 hardware. • ESP32 Technical Reference Manual – Detailed information on how to use the ESP32 memory and peripherals. • ESP32 Hardware Design Guidelines – Guidelines on how to integrate the ESP32 into your hardware product. • ESP32 ECO and Workarounds for Bugs – Correction of ESP32 design errors. • ESP32 Series SoC Errata – Descriptions of known errors in ESP32 series of SoCs. • Certificates https://espressif.com/en/support/documents/certificates • ESP32 Product/Process Change Notifications (PCN) https://espressif.com/en/support/documents/pcns • ESP32 Advisories – Information on security, bugs, compatibility, component reliability. https://espressif.com/en/support/documents/advisories • Documentation Updates and Update Notification Subscription https://espressif.com/en/support/download/documents Developer Zone • ESP-IDF Programming Guide for ESP32 – Extensive documentation for the ESP-IDF development framework. • ESP-IDF and other development frameworks on GitHub. https://github.com/espressif • ESP32 BBS Forum – Engineer-to-Engineer (E2E) Community for Espressif products where you can post questions, share knowledge, explore ideas, and help solve problems with fellow engineers. https://esp32.com/ • ESP-FAQ – A summary document of frequently asked questions released by Espressif. https://espressif.com/projects/esp-faq/en/latest/index.html • The ESP Journal – Best Practices, Articles, and Notes from Espressif folks. https://blog.espressif.com/ • See the tabs SDKs and Demos, Apps, Tools, AT Firmware. https://espressif.com/en/support/download/sdks-demos Products • ESP32 Series SoCs – Browse through all ESP32 SoCs. https://espressif.com/en/products/socs?id=ESP32 • ESP32 Series Modules – Browse through all ESP32-based modules. https://espressif.com/en/products/modules?id=ESP32 • ESP32 Series DevKits – Browse through all ESP32-based devkits. https://espressif.com/en/products/devkits?id=ESP32 • ESP Product Selector – Find an Espressif hardware product suitable for your needs by comparing or applying filters. https://products.espressif.com/#/product-selector?language=en Contact Us • See the tabs Sales Questions, Technical Enquiries, Circuit Schematic & PCB Design Review, Get Samples (Online stores), Become Our Supplier, Comments & Suggestions. https://espressif.com/en/contact-us/sales-questions Espressif Systems 41 Submit Documentation Feedback ESP32-WROOM-32 Datasheet v3.6 Not Recommended For New Designs (NRND) Revision History Revision History Date Version Release notes 2025-08-08 v3.6 • Improved the wording and structure of following sections: – Section 1: Module Overview: Updated Table ”ESP32-WROOM-32 Specifica- tions” to Section 1.1: Features and added Section 1.2: Ordering Information – Updated Section ”Strapping Pins” and renamed to Boot Configurations – Added Section 4: Peripherals – Added Section 5.5: Memory Specifications – Added Section 6: RF Characteristics – Added a note about UART and pin 39 in Section 8: Peripheral Schematics – Added Section Datasheet Versioning 2025-04-11 v3.5 Added notes about erase cycles and retention time for flash in Table “ESP32-WROOM-32 Specifications” that later were moved to Section 5.5: Memory Specifications 2023-02-13 v3.4 Major updates: • Removed contents about hall sensor according to PCN20221202 • Added Section 11: Product Handling Other updates: • Added strapping pin timing in Section ”Strapping Pins” that was renamed to 3: Boot Configurations • Added source files of PCB land patterns and 3D models of the modules (if available) in Section 10.1: PCB Land Pattern 2022.03 v3.3 Added a link to RF certificates in Table ”ESP32-WROOM-32 Specifications” that was re- structured in Section 1.1 Updated Table 12 Added a note below Figure 7 Added Section Related Documentation and Resources 2021.08 v3.2 Replaced Espressif Product Ordering Information with ESP Product Selector Updated the description of TWAI in Section 1.1 Labeled this document as (Not Recommended For New Designs) 2021.02 v3.1 Modified the note below Figure: Reflow Profile Updated the trade mark from TWAI™ to TWAI ® Deleted Reset Circuit and Discharge Circuit for VDD33 Rail in Section 8: Peripheral Schematics Updated Figure 7: Physical Dimensions and Figure 8: Recommended PCB Land Pattern 2020.11 v3.0 Added TWAI TM in Section 1.1 Added a note under Figure: Reflow Profile Updated the C value in RC circuit from 0.1 µF to 1 µF Provided feedback link Espressif Systems 42 Submit Documentation Feedback ESP32-WROOM-32 Datasheet v3.6 Not Recommended For New Designs (NRND) Revision History Date Version Release notes 2019.09 v2.9 • Changed the supply voltage range from 2.7 V ~ 3.6 V to 3.0 V ~ 3.6 V • Added Moisture sensitivity level (MSL) 3 in Table ”ESP32-WROOM-32 Specifications” • Added notes about ”Operating frequency range” and ”TX power” under Table ”Wi- Fi Radio Characteristics” that was restructured in several tables in Section 6: RF Characteristics • Updated Section 8 Peripheral Schematics and added a note about RC delay circuit under it • Updated Figure 8 Recommended PCB Land Pattern 2019.01 v2.8 Changed the RF power control range in Table 23 from –12 ~ +12 to –12 ~ +9 dBm 2018.10 v2.7 Added ”Cumulative IO output current” entry to Table 12: Absolute Maximum Ratings Added more parameters to Table 14: DC Characteristics (3.3 V, 25 °C) 2018.08 v2.6 • Added reliability test items the module has passed in Table ”ESP32-WROOM-32 Specifications”, and removed software-specific information • Updated section ”RTC and Low-Power Management” that was renamed as 5.4: Cur- rent Consumption Characteristics • Changed the module’s dimensions from (18±0.2) mm x (25.5 ±0.2) mm x (3.1±0.15) mm to (18.00±0.10) mm x (25.50±0.10) mm x (3.10±0.10) mm • Updated Figure 7: Physical Dimensions • Updated Table ”Wi-Fi Radio Characteristics” that was restructured in several tables in Section 6: RF Characteristics 2018.06 v2.5 • Changed the module name to ESP32-WROOM-32 • Deleted Temperature Sensor in Table ”ESP32-WROOM-32 Specifications” • Updated Chapter ”Functional Description” (later updated to Section 4: Peripherals) • Added Chapter 10.1: PCB Land Pattern Changes to electrical characteristics: • Updated Table 12: Absolute Maximum Ratings • Added Table 13: Recommended Operating Conditions • Added Table 14: DC Characteristics (3.3 V, 25 °C) • Updated the values of ”Gain control step”, ”Adjacent channel transmit power” in Table 23: Transmitter Characteristics - BLE 2018.03 v2.4 Updated Table ”ESP32-WROOM-32 Specifications” 2018.01 v2.3 Deleted information on LNA pre-amplifier Updated Section ”RTC and Low-Power Management” that was renamed as 5.4: Current Consumption Characteristics Added reset circuit in Chapter 8 and a note to it 2017.10 v2.2 Updated the description of the chip’s system reset in Section ”Strapping Pins” Deleted ”Association sleep pattern” in Table “Power Consumption by Power Modes” and added notes to Active sleep and Modem-sleep Updated the note to Figure 6 Peripheral Schematics Added discharge circuit for VDD33 rail in Chapter 8 and a note to it Espressif Systems 43 Submit Documentation Feedback ESP32-WROOM-32 Datasheet v3.6 Not Recommended For New Designs (NRND) Revision History Date Version Release notes 2017.09 v2.1 Updated operating voltage/power supply range updated to 2.7 ~ 3.6 V Updated Chapter 8 2017.08 v2.0 Changed the sensitivity of NZIF receiver to -97 dBm in Table ”ESP32-WROOM-32 Specifi- cations” Updated the dimensions of the module Updated Table “Power Consumption by Power Modes” Power Consumption by Power Modes, and added two notes to it Updated Table 12, Table ”Wi-Fi Radio Characteristics”, 22, 23 Added Chapter 9 Added the link to Certification Download 2017.06 v1.9 Added a note to Section 2.1 Pin Layout Updated Section ”Crystal Oscillators” Updated Figure 5 ESP-WROOM-32 Schematics Added Documentation Change Notification 2017.05 v1.8 Updated Figure 1 Top and Side View of ESP32-WROOM-32 (ESP-WROOM-32) 2017.04 v1.7 Added the module’s dimensional tolerance Changed the input impedance value of 50 Ω in Table ”Wi-Fi Radio Characteristics” (restruc- tured in several tables in Section 6: RF Characteristics) to output impedance value of 30+j10 Ω 2017.04 v1.6 Added Figure: Reflow Profile 2017.03 v1.5 Updated Section 2.2 Pin Description Updated Section ”External Flash and SRAM” Updated Section ”Peripherals and Sensors Description” 2017.03 v1.4 Updated Preface Updated Chapter 2 Pin Definitions Updated Chapter ”Functional Description” Updated Table Recommended Operating Conditions Updated Table ”Wi-Fi Radio Characteristics” Updated Section: Reflow Profile Added Chapter Learning Resources 2016.12 v1.3 Updated Section 2.1 Pin Layout 2016.11 v1.2 Added Figure 6 Peripheral Schematics 2016.11 v1.1 Updated Chapter 8 Schematics 2016.08 v1.0 First release Espressif Systems 44 Submit Documentation Feedback ESP32-WROOM-32 Datasheet v3.6 Not Recommended For New Designs (NRND) Disclaimer and Copyright Notice Information in this document, including URL references, is subject to change without notice. ALL THIRD PARTY’S INFORMATION IN THIS DOCUMENT IS PROVIDED AS IS WITH NO WARRANTIES TO ITS AUTHENTICITY AND ACCURACY. NO WARRANTY IS PROVIDED TO THIS DOCUMENT FOR ITS MERCHANTABILITY, NON-INFRINGEMENT, FITNESS FOR ANY PARTICULAR PURPOSE, NOR DOES ANY WARRANTY OTHERWISE ARISING OUT OF ANY PROPOSAL, SPECIFICATION OR SAMPLE. All liability, including liability for infringement of any proprietary rights, relating to use of information in this document is disclaimed. No licenses express or implied, by estoppel or otherwise, to any intellectual property rights are granted herein. The Wi-Fi Alliance Member logo is a trademark of the Wi-Fi Alliance. The Bluetooth logo is a registered trademark of Bluetooth SIG. All trade names, trademarks and registered trademarks mentioned in this document are property of their respective owners, and are hereby acknowledged. Copyright © 2025 Espressif Systems (Shanghai) Co., Ltd. All rights reserved. www.espressif.com