1 Module Overview 1.1 Features 1.2 Series Comparison 1.3 Applications 2 Block Diagram 3 Pin Definitions 3.1 Pin Layout 3.2 Pin Description 4 Boot Configurations 4.1 Chip Boot Mode Control 4.2 ROM Messages Printing Control 5 Peripherals 5.1 Peripheral Overview 5.2 Peripheral Description 5.2.1 Connectivity Interface 5.2.1.1 UART Controller 5.2.1.2 SPI Controller 5.2.1.3 I2C Controller 5.2.1.4 LED PWM Controller 5.2.2 Analog Signal Processing 5.2.2.1 SAR ADC 5.2.2.2 Temperature Sensor 6 Electrical Characteristics 6.1 Absolute Maximum Ratings 6.2 Recommended Operating Conditions 6.3 DC Characteristics (3.3 V, 25 °C) 6.4 Current Consumption Characteristics 6.4.1 Current Consumption in Active Mode 6.4.2 Current Consumption in Other Modes 7 RF Characteristics 7.1 Wi-Fi Radio 7.1.1 Wi-Fi RF Transmitter (TX) Characteristics 7.1.2 Wi-Fi RF Receiver (RX) Characteristics 7.2 Bluetooth 5 (LE) Radio 7.2.1 Bluetooth LE RF Transmitter (TX) Characteristics 7.2.2 Bluetooth LE RF Receiver (RX) Characteristics 8 Module Schematics 9 Peripheral Schematics 10 Module Dimensions 11 PCB Layout Recommendations 11.1 PCB Land Pattern 11.2 Module Placement for PCB Design 12 Product Handling 12.1 Storage Conditions 12.2 Electrostatic Discharge (ESD) 12.3 Reflow Profile 12.4 Ultrasonic Vibration Related Documentation and Resources Revision History ESP8684-WROOM-04C Datasheet Version 1.4 2.4 GHz Wi-Fi (802.11 b/g/n) and Bluetooth ® 5 module Built around ESP8684 series of SoC, RISC-V single-core microprocessor 2 MB/4 MB flash in chip package 14 GPIOs On-board PCB antenna ESP8684-WROOM-04C www.espressif.com 1 Module Overview 1 Module Overview 1.1 Features CPU and On-Chip Memory • ESP8684H2X or ESP8684H4X embedded, 32-bit RISC-V single-core processor, up to 120 MHz • 576 KB ROM • 272 KB SRAM (16 KB for cache) • In-Package flash (see details in Table 1 Series Comparison) • Access to flash accelerated by cache • Supports flash in-Circuit Programming (ICP) Wi-Fi • IEEE 802.11 b/g/n-compliant • Center frequency range of operating channel: 2412 ~ 2484 MHz • Supports 20 MHz bandwidth in 2.4 GHz band • 1T1R mode with data rate up to 72.2 Mbps • Wi-Fi Multimedia (WMM) • TX/RX A-MPDU, TX/RX A-MSDU • Immediate Block ACK • Fragmentation and defragmentation • Transmit opportunity (TXOP) • Automatic Beacon monitoring (hardware TSF) • 3 × virtual Wi-Fi interfaces • Simultaneous support for Infrastructure BSS in Station mode, SoftAP mode, Station + SoftAP mode, and promiscuous mode Note that when ESP8684 series scans in Station mode, the SoftAP channel will change along with the Station channel Bluetooth ® • Bluetooth LE: Bluetooth 5.3 certified • High power mode (20 dBm) • Speed: 125 kbps, 500 kbps, 1 Mbps, 2 Mbps • Advertising extensions • Multiple advertisement sets • Channel selection algorithm #2 • Internal co-existence mechanism between Wi-Fi and Bluetooth to share the same antenna Peripherals • Up to 14 GPIOs – 2 strapping GPIOs • GPIO, SPI, UART, I2C, LED PWM controller, general DMA controller, SAR ADC, temperature sensor, general-purpose timers, system timers, and watchdog timers Note: * Please refer to ESP8684 Series Datasheet for de- tailed information about the module peripherals. Integrated Components on Module • 26 MHz crystal oscillator Antenna Options • On-board PCB antenna Operating Conditions • Operating voltage/Power supply: 3.0 ~ 3.6 V • Operating ambient temperature: –40 ~ 105 °C Certification • Bluetooth certification: BQB • Green certification: RoHS/REACH Test • HTOL/HTSL/uHAST/TCT/ESD/Latch-up Espressif Systems 2 Submit Documentation Feedback ESP8684-WROOM-04C Datasheet v1.4 1 Module Overview 1.2 Series Comparison ESP8684-WROOM-04C is a general-purpose Wi-Fi and Bluetooth LE module. The rich set of peripherals and high performance make this module an ideal choice for smart homes, industrial automation, health care, consumer electronics, etc. ESP8684-WROOM-04C comes with a PCB antenna. The series comparison for ESP8684-WROOM-04C is as follows: Table 1: ESP8684-WROOM-04C Series Comparison Ambient Temp. 4 Size 5 Ordering Code In-Package Flash 1,2 Chip Revision 3 (°C) (mm) ESP8684-WROOM-04C-H2X 2 MB v2.0 –40 ~105 24.0 × 16.0 × 3.1 ESP8684-WROOM-04C-H4X 4 MB 1 The in-package flash supports: - More than 100,000 program/erase cycles - More than 20 years data retention time 2 By default, the SPI flash on the module operates at a maximum clock frequency of 60 MHz and does not support the auto suspend feature. If you need the flash auto suspend feature, please contact us. 3 Compared to previous chip versions, chip version v2.0 provides an additional 20 KB of SRAM and approximately 100 KB of flash memory (subject to actual application). 4 Ambient temperature specifies the recommended temperature range of the environment immediately outside the Espressif module. 5 For details, refer to Section 10 Module Dimensions. The ESP8684H2X chip and the ESP8684H4X chip fall into the same category, namely ESP8684 chip series, which has a 32-bit RISC-V single-core processor. ESP8684 integrates a rich set of peripherals including GPIO, SPI, UART, I2C, LED PWM controller, general DMA controller, SAR ADC, temperature sensor, general-purpose timers, system timers, and watchdog timers. Note: For more information on ESP8684, please refer to ESP8684 Series Datasheet. 1.3 Applications • Smart Home • Industrial Automation • Health Care • Consumer Electronics • Smart Agriculture • POS Machines • Service Robot • Generic Low-power IoT Sensor Hubs • Generic Low-power IoT Data Loggers Espressif Systems 3 Submit Documentation Feedback ESP8684-WROOM-04C Datasheet v1.4 Contents Contents 1 Module Overview 2 1.1 Features 2 1.2 Series Comparison 3 1.3 Applications 3 2 Block Diagram 8 3 Pin Definitions 9 3.1 Pin Layout 9 3.2 Pin Description 9 4 Boot Configurations 11 4.1 Chip Boot Mode Control 12 4.2 ROM Messages Printing Control 12 5 Peripherals 14 5.1 Peripheral Overview 14 5.2 Peripheral Description 14 5.2.1 Connectivity Interface 14 5.2.1.1 UART Controller 14 5.2.1.2 SPI Controller 15 5.2.1.3 I2C Controller 16 5.2.1.4 LED PWM Controller 16 5.2.2 Analog Signal Processing 16 5.2.2.1 SAR ADC 17 5.2.2.2 Temperature Sensor 17 6 Electrical Characteristics 18 6.1 Absolute Maximum Ratings 18 6.2 Recommended Operating Conditions 18 6.3 DC Characteristics (3.3 V, 25 °C) 18 6.4 Current Consumption Characteristics 19 6.4.1 Current Consumption in Active Mode 19 6.4.2 Current Consumption in Other Modes 19 7 RF Characteristics 20 7.1 Wi-Fi Radio 20 7.1.1 Wi-Fi RF Transmitter (TX) Characteristics 20 7.1.2 Wi-Fi RF Receiver (RX) Characteristics 21 7.2 Bluetooth 5 (LE) Radio 22 7.2.1 Bluetooth LE RF Transmitter (TX) Characteristics 22 7.2.2 Bluetooth LE RF Receiver (RX) Characteristics 23 Espressif Systems 4 Submit Documentation Feedback ESP8684-WROOM-04C Datasheet v1.4 Contents 8 Module Schematics 26 9 Peripheral Schematics 27 10 Module Dimensions 28 11 PCB Layout Recommendations 29 11.1 PCB Land Pattern 29 11.2 Module Placement for PCB Design 30 12 Product Handling 31 12.1 Storage Conditions 31 12.2 Electrostatic Discharge (ESD) 31 12.3 Reflow Profile 31 12.4 Ultrasonic Vibration 32 Related Documentation and Resources 33 Revision History 34 Espressif Systems 5 Submit Documentation Feedback ESP8684-WROOM-04C Datasheet v1.4 List of Tables List of Tables 1 ESP8684-WROOM-04C Series Comparison 3 2 Pin Definitions 10 3 Default Configuration of Strapping Pins 11 4 Description of Timing Parameters for the Strapping Pins 11 5 Chip Boot Mode Control 12 6 UART0 ROM Message Printing Control 13 7 Absolute Maximum Ratings 18 8 Recommended Operating Conditions 18 9 DC Characteristics (3.3 V, 25 °C) 18 10 Current Consumption for Wi-Fi (2.4 GHz) in Active Mode 19 11 Current Consumption in Low-Power Modes 19 12 Current Consumption in Modem-sleep Mode 19 13 Wi-Fi RF Characteristics 20 14 TX Power with Spectral Mask and EVM Meeting 802.11 Standards 20 15 TX EVM Test 1 20 16 RX Sensitivity 21 17 Maximum RX Level 21 18 RX Adjacent Channel Rejection 22 19 Bluetooth LE RF Characteristics 22 20 Bluetooth LE - Transmitter Characteristics - 1 Mbps 22 21 Bluetooth LE - Transmitter Characteristics - 2 Mbps 22 22 Bluetooth LE - Transmitter Characteristics - 125 kbps 23 23 Bluetooth LE - Transmitter Characteristics - 500 kbps 23 24 Bluetooth LE - Receiver Characteristics - 1 Mbps 23 25 Bluetooth LE - Receiver Characteristics - 2 Mbps 24 26 Bluetooth LE - Receiver Characteristics - 125 kbps 25 27 Bluetooth LE - Receiver Characteristics - 500 kbps 25 Espressif Systems 6 Submit Documentation Feedback ESP8684-WROOM-04C Datasheet v1.4 List of Figures List of Figures 1 ESP8684-WROOM-04C Block Diagram 8 2 Pin Layout (Top View) 9 3 Visualization of Timing Parameters for the Strapping Pins 12 4 ESP8684-WROOM-04C Schematics 26 5 Peripheral Schematics 27 6 Physical Dimensions 28 7 Recommended PCB Land Pattern 29 8 Reflow Profile 31 Espressif Systems 7 Submit Documentation Feedback ESP8684-WROOM-04C Datasheet v1.4 2 Block Diagram 2 Block Diagram SPI Flash ESP8684 RF Matching 26 MHz Crystal 3V3 ESP8684-WROOM-04C EN GPIOs Antenna Figure 1: ESP8684-WROOM-04C Block Diagram Espressif Systems 8 Submit Documentation Feedback ESP8684-WROOM-04C Datasheet v1.4 3 Pin Definitions 3 Pin Definitions 3.1 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 10 Module Dimensions. Keepout Zone IO0 1 IO1 2 EN 3 IO2 4 IO4 5 IO5 6 IO6 7 TXD0 22 3V3 8 RXD0 21 IO3 20 IO10 19 IO9 18 IO8 17 IO7 16 GND 15 NC 9 NC 10 NC 11 IO18 12 NC 13 NC 14 GND GND 23 A Figure 2: Pin Layout (Top View) Note A: The zone marked with dotted lines is the antenna keepout zone. To learn more about the keepout zone for module’s antenna on the base board, please refer to ESP8684 Hardware Design Guidelines > Section Positioning a Module on a Base Board. 3.2 Pin Description The module has 17 pins. See pin definitions in Table 2 Pin Description. Espressif Systems 9 Submit Documentation Feedback ESP8684-WROOM-04C Datasheet v1.4 3 Pin Definitions For peripheral pin configurations, please refer to ESP8684 Series Datasheet. Table 2: Pin Definitions Name No. Type 1 Function IO0 1 I/O/T GPIO0,ADC1_CH0 IO1 2 I/O/T GPIO1, ADC1_CH1 EN 3 I High: on, enables the chip. Low: off, the chip powers off. Default: internally pulled-up IO2 4 I/O/T GPIO2, ADC1_CH2, FSPIQ IO4 5 I/O/T GPIO4, ADC1_CH4, FSPIHD, MTMS, LED PWM IO5 6 I/O/T GPIO5, FSPIWP, MTDI, LED PWM IO6 7 I/O/T GPIO6, FSPICLK, MTCK, LED PWM 3V3 8 P Power supply NC 9-11, 13-14 — NC IO18 12 I/O/T GPIO18 GND 15, 23 P Ground IO7 16 I/O/T GPIO7, FSPID, MTDO, LED PWM IO8 17 I/O/T GPIO8 IO9 18 I/O/T GPIO9 IO10 19 I/O/T GPIO10, FSPICS0, LED PWM IO3 20 I/O/T GPIO3, ADC1_CH3, LED PWM RXD0 21 I/O/T GPIO19, U0RXD TXD0 22 I/O/T GPIO20, U0TXD 1 P: power supply; I: input; O: output; T: high impedance. Note: IO0, IO1, IO3, IO5/MTDI pins have low-level glitches during chip power up. See details in section General Purpose Input / Output Interface (GPIO) of ESP8684 Series Datasheet. Espressif Systems 10 Submit Documentation Feedback ESP8684-WROOM-04C Datasheet v1.4 4 Boot Configurations 4 Boot Configurations Note: The content below is excerpted from ESP8684 Series Datasheet > Section Boot Configurations. For the strapping pin mapping between the chip and modules, please refer to Chapter 8 Module Schematics. The module allows for configuring the following boot parameters through strapping pins and eFuse parameters at power-up or a hardware reset, without microcontroller interaction. • Chip boot mode – Strapping pin: GPIO8 and GPIO9 • ROM message printing – Strapping pin: GPIO8 – eFuse parameter: EFUSE_UART_PRINT_CONTROL The default values of all the above eFuse parameters are 0, which means that they are not burnt. Given that eFuse is one-time programmable, once programmed to 1, it can never be reverted to 0. For how to program eFuse parameters, please refer to ESP8684 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 GPIO8 N/A - GPIO9 Internal weak pull-up 1 To change the bit values, the strapping pins should be connected to external pull-down/pull-up resistances. If the ESP8684 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. The timing of signals connected to the strapping pins should adhere to the setup time and hold time specifications in Table 4 and Figure 3. Table 4: Description of Timing Parameters for the Strapping Pins Parameter Description Min (ms) t 0 Setup time before CHIP_EN goes from low to high 0 t 1 Hold time after CHIP_EN goes high 3 Espressif Systems 11 Submit Documentation Feedback ESP8684-WROOM-04C Datasheet v1.4 4 Boot Configurations CHIP_EN t 1 t 0 Strapping pin V IL_nRST V IH Figure 3: Visualization of Timing Parameters for the Strapping Pins 4.1 Chip Boot Mode Control GPIO8 and GPIO9 control the boot mode after the reset is released. See Table 5 Chip Boot Mode Control. Table 5: Chip Boot Mode Control Boot Mode GPIO9 GPIO8 SPI boot mode 1 x 2 Joint download boot mode 3 0 1 1 Bold marks the default value and configuration. 2 Values that have no effect on the result and can therefore be ignored. 3 Joint Download Boot mode supports UART Download Boot. In addition to SPI Boot and Joint Download Boot modes, ESP8684 also supports SPI Download Boot mode. For details, please see ESP8684 Technical Reference Manual > Chapter Chip Boot Control. 4.2 ROM Messages Printing Control EFUSE_UART_PRINT_CONTROL and GPIO8 control ROM messages printing to UART0 as shown in Table 6 UART0 ROM Message Printing Control. Espressif Systems 12 Submit Documentation Feedback ESP8684-WROOM-04C Datasheet v1.4 4 Boot Configurations Table 6: UART0 ROM Message Printing Control UART0 ROM Code Printing eFuse 1 GPIO8 Enabled 0 Ignored 1 0 2 1 Disabled 1 1 2 0 3 Ignored 1 EFUSE_UART_PRINT_CONTROL Espressif Systems 13 Submit Documentation Feedback ESP8684-WROOM-04C Datasheet v1.4 5 Peripherals 5 Peripherals 5.1 Peripheral Overview ESP8684 integrates a rich set of peripherals including GPIO, SPI, UART, I2C, LED PWM controller, general DMA controller, SAR ADC, temperature sensor, general-purpose timers, system timers, and watchdog timers. To learn more about on-chip components, please refer to ESP8684 Series Datasheet > Section Functional Description. Note: The content below is sourced from ESP8684 Series Datasheet > Section Peripherals. Some information may not be ap- plicable to ESP8684-WROOM-04C as not all the IO signals are exposed on the module. To learn more about peripheral signals, please refer to ESP8684 Technical Reference Manual > Section Peripheral Signal List. 5.2 Peripheral Description This section describes the chip’s peripheral capabilities, covering connectivity interfaces and on-chip sensors that extend its functionality. 5.2.1 Connectivity Interface This subsection describes the connectivity interfaces on the chip that enable communication and interaction with external devices and networks. 5.2.1.1 UART Controller The UART Controller in the ESP8684 chip facilitates the transmission and reception of asynchronous serial data between the chip and external UART devices. It supports two UART interfaces. Feature List • Full-duplex asynchronous communication • Configurable baud rate, up to 2.5 Mbaud • Automatic baud rate detection of input signals • Data frame format: – a START bit – data bits, ranging from 5 ~ 8 – a parity bit – stop bits, whose length can be 1, 1.5, or 2 bits • Special character AT_CMD detection • Supported protocols: RS485, IrDA Espressif Systems 14 Submit Documentation Feedback ESP8684-WROOM-04C Datasheet v1.4 5 Peripherals • UART as wake-up source • Software and hardware flow control • Three clock sources that can be divided: – 40 MHz PLL_F40M_CLK – internal fast RC oscillator RC_FAST_CLK – external crystal clock XTAL_CLK • 512 x 8-bit RAM shared by TX FIFOs and RX FIFOs of the two UART controllers Pin Assignment For UART, the pins used can be chosen from any GPIOs via the GPIO Matrix. For more information about the pin assignment, see ESP8684 Series Datasheet > Section IO Pins and ESP8684 Technical Reference Manual > Chapter IO MUX and GPIO Matrix. 5.2.1.2 SPI Controller ESP8684 series features three SPI interfaces (SPI0, SPI1, and SPI2). SPI0 and SPI1 can be configured to operate in SPI memory mode and SPI2 can be configured to operate in general-purpose SPI mode. SPI0 and SPI1 are reserved for system use, and only SPI2 is available for users. Features of SPI0 and SPI1 • Data is transferred in bytes • Up to four-line STR reads and writes are supported • The clock frequency is configurable to a maximum of 60 MHz in STR mode Features of SPI2 General-purpose SPI (GP-SPI) • It can operate in master and slave modes • It supports two-line full-duplex communication and single-/two-/four-line half-duplex communication in both master and slave modes • The host’s clock frequency of SPI2 is configurable. The clock frequency is 40 MHz at most • Data is transferred in bytes • The clock polarity (CPOL) and phase (CPHA) are also configurable • The SPI2 interface can connect to GDMA Pin Assignment For SPI2, the pins used can be chosen from any GPIOs via the GPIO Matrix. For more information about the pin assignment, see ESP8684 Series Datasheet > Section IO Pins and ESP8684 Technical Reference Manual > Chapter IO MUX and GPIO Matrix. Espressif Systems 15 Submit Documentation Feedback ESP8684-WROOM-04C Datasheet v1.4 5 Peripherals 5.2.1.3 I2C Controller The I2C Controller supports communication between the master and slave devices using the I2C bus. Feature List • one I2C controller operating in master mode • Standard mode (100 Kbit/s) and fast mode (400 Kbit/s) • Up to 800 Kbit/s (constrained by SCL and SDA pull-up strength) • Support for 7-bit and 10-bit addressing, as well as dual address mode • 7-bit broadcast address Pin Assignment For I2C, the pins used can be chosen from any GPIOs via the GPIO Matrix. For more information about the pin assignment, see ESP8684 Series Datasheet > Section IO Pins and ESP8684 Technical Reference Manual > Chapter IO MUX and GPIO Matrix. 5.2.1.4 LED PWM Controller The LED PWM Controller (LEDC) is designed to generate PWM signals for LED control. Feature List • Six independent PWM generators • Maximum PWM duty cycle resolution of 14 bits • Four independent timers with 14-bit counters, configurable fractional clock dividers and counter overflow values • Adjustable phase of PWM signal output • PWM duty cycle dithering • Automatic duty cycle fading • PWM signal output in low-power mode (Light-sleep mode) 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 ESP8684 Series Datasheet > Section IO Pins and ESP8684 Technical Reference Manual > Chapter IO MUX and GPIO Matrix. 5.2.2 Analog Signal Processing This subsection describes components on the chip that sense and process real-world data. Espressif Systems 16 Submit Documentation Feedback ESP8684-WROOM-04C Datasheet v1.4 5 Peripherals 5.2.2.1 SAR ADC ESP8684 integrates a Successive Approximation Analog-to-Digital Converter (SAR ADC) to convert analog signals into digital representations. Feature List • 12-bit sampling resolution • Analog voltage sampling from up to five pins • One DIG ADC controller – Provides separate control modules for one-time sampling and multi-channel scanning – Supports one-time sampling and multi-channel scanning working simultaneously – User-defined scanning sequence in multi-channel scanning mode – Provides two filters with configurable filter coefficient – Supports threshold monitoring Pin Assignment The pins for the SAR ADC are multiplexed with GPIO0 ~ GPIO4, JTAG. For more information about the pin assignment, see ESP8684 Series Datasheet > Section IO Pins and ESP8684 Technical Reference Manual > Chapter IO MUX and GPIO Matrix. 5.2.2.2 Temperature Sensor The Temperature Sensor in the ESP8684 chip allows for real-time monitoring of temperature changes inside the chip. Feature List • Measurement range: –40 °C ~ 125 °C • Software triggering, wherein the data can be read continuously once triggered • Configurable temperature offset based on the environment to improve the accuracy • Adjustable measurement range Espressif Systems 17 Submit Documentation Feedback ESP8684-WROOM-04C Datasheet v1.4 6 Electrical Characteristics 6 Electrical Characteristics 6.1 Absolute Maximum Ratings Stresses above those listed in Table 7 Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only and functional operation of the device at these or any other conditions beyond those indicated under Table 8 Recommended Operating Conditions is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. Table 7: Absolute Maximum Ratings Symbol Parameter Min Max Unit VDD33 Power supply voltage –0.3 3.6 V T ST OR E Storage temperature –40 105 °C 6.2 Recommended Operating Conditions Table 8: Recommended Operating Conditions Symbol Parameter Min Typ 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 A Operating ambient temperature –40 — 105 °C 6.3 DC Characteristics (3.3 V, 25 °C) Table 9: 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 2 High-level output voltage 0.8 × VDD 1 — — V V OL 2 Low-level output voltage — — 0.1 × VDD 1 V I OH High-level source current (VDD 1 = 3.3 V, V OH >= 2.64 V, PAD_DRIVER = 3) — 40 — mA I OL Low-level sink current (VDD 1 = 3.3 V, V OL = 0.495 V, PAD_DRIVER = 3) — 28 — mA R P U Pull-up resistor — 45 — kΩ R P D Pull-down resistor — 45 — kΩ V IH_nRST Chip reset release voltage 0.75 × VDD 1 — VDD 1 + 0.3 V V IL_nRST Chip reset voltage –0.3 — 0.25 × VDD 1 V Espressif Systems 18 Submit Documentation Feedback ESP8684-WROOM-04C Datasheet v1.4 6 Electrical Characteristics 1 VDD is the I/O voltage for a particular power domain of pins. 2 V OH and V OL are measured using high-impedance load. 6.4 Current Consumption Characteristics 6.4.1 Current Consumption in Active Mode The current consumption measurements are taken with a 3.3 V supply at 25 °C ambient temperature. TX current consumption is rated at a 100% duty cycle. RX current consumption is rated when the peripherals are disabled and the CPU idle. Table 10: Current Consumption for Wi-Fi (2.4 GHz) in Active Mode Work Mode RF Condition Description Peak (mA) Active (RF working) TX 802.11b, 1 Mbps, DSSS @21.0 dBm 364 802.11g, 54 Mbps, OFDM @19.0 dBm 305 802.11n, HT20, MCS7 @18.0 dBm 287 RX 802.11b/g/n, HT20 63 Note: The content below is excerpted from Section Power Consumption in Other Modes in ESP8684 Series Datasheet. 6.4.2 Current Consumption in Other Modes Table 11: Current Consumption in Low-Power Modes Work mode Description Typ Unit Light-sleep — 140 µA Deep-sleep Only RTC timer is powered on 5 µA Power off CHIP_EN is set to low level, and the chip is powered off 1 µA Table 12: Current Consumption in Modem-sleep Mode Work mode Frequency (MHz) Description Typ 1 (mA) Typ 2 (mA) Modem-sleep 3 80 WFI (Wait-for-Interrupt) 9.4 10.3 CPU run at full speed 12.1 13.0 120 WFI (Wait-for-Interrupt) 10.7 11.5 CPU run at full speed 14.7 15.6 1 Current consumption when all peripheral clocks are disabled. 2 Current consumption when all peripheral clocks are enabled. In practice, the current consumption might be different depending on which peripherals are enabled. 3 In Modem-sleep mode, Wi-Fi is clock gated, and the current consumption might be higher when accessing flash. For a flash rated at 80 Mbit/s, in SPI 2-line mode the consumption is 10 mA. Espressif Systems 19 Submit Documentation Feedback ESP8684-WROOM-04C Datasheet v1.4 7 RF Characteristics 7 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. 7.1 Wi-Fi Radio Table 13: Wi-Fi RF Characteristics Name Description Center frequency range of operating channel 2412 ~ 2484 MHz Wi-Fi wireless standard IEEE 802.11b/g/n 7.1.1 Wi-Fi RF Transmitter (TX) Characteristics Table 14: TX Power with Spectral Mask and EVM Meeting 802.11 Standards Min Typ Max Rate (dBm) (dBm) (dBm) 802.11b, 1 Mbps, DSSS — 21.0 — 802.11b, 11 Mbps, CCK — 21.0 — 802.11g, 6 Mbps, OFDM — 21.0 — 802.11g, 54 Mbps, OFDM — 19.0 — 802.11n, HT20, MCS0 — 19.0 — 802.11n, HT20, MCS7 — 18.0 — Table 15: 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 — –25.0 –5.0 802.11g, 54 Mbps, OFDM — –30.0 –25.0 802.11n, HT20, MCS0 — –29.0 –5.0 802.11n, HT20, MCS7 — –31.0 –27.0 1 EVM is measured at the corresponding typical TX power provided in Table 14 Wi-Fi RF Transmitter (TX) Characteristics above. Espressif Systems 20 Submit Documentation Feedback ESP8684-WROOM-04C Datasheet v1.4 7 RF Characteristics 7.1.2 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 16: RX Sensitivity Min Typ Max Rate (dBm) (dBm) (dBm) 802.11b, 1 Mbps, DSSS — –99.2 — 802.11b, 2 Mbps, DSSS — –96.4 — 802.11b, 5.5 Mbps, CCK — –93.2 — 802.11b, 11 Mbps, CCK — –89.4 — 802.11g, 6 Mbps, OFDM — –94.0 — 802.11g, 9 Mbps, OFDM — –92.0 — 802.11g, 12 Mbps, OFDM — –91.4 — 802.11g, 18 Mbps, OFDM — –89.0 — 802.11g, 24 Mbps, OFDM — –86.2 — 802.11g, 36 Mbps, OFDM — –82.2 — 802.11g, 48 Mbps, OFDM — –78.0 — 802.11g, 54 Mbps, OFDM — –76.4 — 802.11n, HT20, MCS0 — –93.4 — 802.11n, HT20, MCS1 — –91.2 — 802.11n, HT20, MCS2 — –88.2 — 802.11n, HT20, MCS3 — –84.6 — 802.11n, HT20, MCS4 — –81.0 — 802.11n, HT20, MCS5 — –77.4 — 802.11n, HT20, MCS6 — –75.4 — 802.11n, HT20, MCS7 — –74.0 — Table 17: Maximum RX Level Min Typ Max Rate (dBm) (dBm) (dBm) 802.11b, 1 Mbps, DSSS — 5 — 802.11b, 11 Mbps, CCK — 5 — 802.11g, 6 Mbps, OFDM — 5 — 802.11g, 54 Mbps, OFDM — 0 — 802.11n, HT20, MCS0 — 5 — 802.11n, HT20, MCS7 — –1 — Espressif Systems 21 Submit Documentation Feedback ESP8684-WROOM-04C Datasheet v1.4 7 RF Characteristics Table 18: 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 — 31 — 802.11g, 54 Mbps, OFDM — 20 — 802.11n, HT20, MCS0 — 31 — 802.11n, HT20, MCS7 — 16 — 7.2 Bluetooth 5 (LE) Radio Table 19: Bluetooth LE RF Characteristics Name Description Center frequency range of operating channel 2402 ~ 2480 MHz RF transmit power range –24.0 ~ 20.0 dBm 7.2.1 Bluetooth LE RF Transmitter (TX) Characteristics Table 20: Bluetooth LE - Transmitter Characteristics - 1 Mbps Parameter Description Min Typ Max Unit Carrier frequency offset and drift Max. |f n | n=0, 1, 2, 3, ...k — 1.4 — kHz Max. |f 0 − f n | n=2, 3, 4, ...k — 1.7 — kHz Max. |f n − f n−5 | n=6, 7, 8, ...k — 0.9 — kHz |f 1 − f 0 | — 1.0 — kHz Modulation characteristics ∆ F 1 avg — 250.2 — kHz Min. ∆ F 2 max (for at least 99.9% of all ∆ F 2 max ) — 238.2 — kHz ∆ F 2 avg /∆ F 1 avg — 1.00 — — In-band emissions ± 2 MHz offset — –32 — dBm ± 3 MHz offset — –38 — dBm > ± 3 MHz offset — –41 — dBm Table 21: Bluetooth LE - Transmitter Characteristics - 2 Mbps Parameter Description Min Typ Max Unit Carrier frequency offset and drift Max. |f n | n=0, 1, 2, 3, ...k — 4.0 — kHz Max. | f 0 − f n | n=2, 3, 4, ...k — 1.6 — kHz Max. |f n − f n−5 | n=6, 7, 8, ...k — 1.0 — kHz |f 1 − f 0 | — 0.7 — kHz Cont’d on next page Espressif Systems 22 Submit Documentation Feedback ESP8684-WROOM-04C Datasheet v1.4 7 RF Characteristics Table 21 – cont’d from previous page Parameter Description Min Typ Max Unit Modulation characteristics ∆ F 1 avg — 497.4 — kHz Min. ∆ F 2 max (for at least 99.9% of all ∆ F 2 max ) — 477.5 — kHz ∆ F 2 avg /∆ F 1 avg — 1.00 — — In-band emissions ± 4 MHz offset — –40 — dBm ± 5 MHz offset — –43 — dBm > ± 5 MHz offset — –44 — dBm Table 22: Bluetooth LE - Transmitter Characteristics - 125 kbps Parameter Description Min Typ Max Unit Carrier frequency offset and drift Max. |f n | n=0, 1, 2, 3, ...k — 0.5 — kHz Max. |f 0 − f n | n=1, 2, 3, ...k — 0.4 — kHz |f 0 − f 3 | — 0.2 — kHz Max. |f n − f n−3 | n=7, 8, 9, ...k — 0.6 — kHz Modulation characteristics ∆ F 1 avg — 249.8 — kHz Min. ∆ F 1 max (for at least 99.9% of all ∆ F 1 max ) — 238.9 — kHz In-band emissions ± 2 MHz offset — –32 — dBm ± 3 MHz offset — –38 — dBm > ± 3 MHz offset — –41 — dBm Table 23: Bluetooth LE - Transmitter Characteristics - 500 kbps Parameter Description Min Typ Max Unit Carrier frequency offset and drift Max. |f n | n=0, 1, 2, 3, ...k — 0.5 — kHz Max. |f 0 − f n | n=1, 2, 3, ...k — 0.5 — kHz |f 0 − f 3 | — 0.2 — kHz Max. |f n − f n−3 | n=7, 8, 9, ...k — 0.6 — kHz Modulation characteristics ∆ F 2 avg — 250.9 — kHz Min. ∆ F 2 max (for at least 99.9% of all ∆ F 2 max ) — 236.8 — kHz In-band emissions ± 2 MHz offset — –32 — dBm ± 3 MHz offset — –38 — dBm > ± 3 MHz offset — –41 — dBm 7.2.2 Bluetooth LE RF Receiver (RX) Characteristics Table 24: Bluetooth LE - Receiver Characteristics - 1 Mbps Parameter Description Min Typ Max Unit Sensitivity @30.8% PER — — –98.0 — dBm Cont’d on next page Espressif Systems 23 Submit Documentation Feedback ESP8684-WROOM-04C Datasheet v1.4 7 RF Characteristics Table 24 – cont’d from previous page Parameter Description Min Typ Max Unit Maximum received signal @30.8% PER — — 8 — dBm C/I and receiver selectivity performance Co-channel F = F0 MHz — 8 — dB Adjacent channel F = F0 + 1 MHz — –1 — dB F = F0 – 1 MHz — –3 — dB F = F0 + 2 MHz — –26 — dB F = F0 – 2 MHz — –28 — dB F = F0 + 3 MHz — –34 — dB F = F0 – 3 MHz — –33 — dB F ≥ F0 + 4 MHz — –33 — dB F ≤ F0 – 4 MHz — –31 — dB Image frequency — — –33 — dB Adjacent channel to image frequency F = F image + 1 MHz — –32 — dB F = F image – 1 MHz — –34 — dB 30 MHz ~ 2000 MHz — –23 — dBm Out-of-band blocking performance 2003 MHz ~ 2399 MHz — –30 — dBm 2484 MHz ~ 2997 MHz — –10 — dBm 3000 MHz ~ 12.75 GHz — –17 — dBm Intermodulation — — –31 — dBm Table 25: Bluetooth LE - Receiver Characteristics - 2 Mbps Parameter Description Min Typ Max Unit Sensitivity @30.8% PER — — –94.0 — dBm Maximum received signal @30.8% PER — — 8 — dBm C/I and receiver selectivity performance Co-channel F = F0 MHz — 9 — dB Adjacent channel F = F0 + 2 MHz — –11 — dB F = F0 – 2 MHz — –7 — dB F = F0 + 4 MHz — –35 — dB F = F0 – 4 MHz — –30 — dB F = F0 + 6 MHz — –35 — dB F = F0 – 6 MHz — –29 — dB F ≥ F0 + 8 MHz — –39 — dB F ≤ F0 – 8 MHz — –33 — dB Image frequency — — –35 — dB Adjacent channel to image frequency F = F image + 2 MHz — –35 — dB F = F image – 2 MHz — –11 — dB 30 MHz ~ 2000 MHz — –30 — dBm Out-of-band blocking performance 2003 MHz ~ 2399 MHz — –34 — dBm 2484 MHz ~ 2997 MHz — –19 — dBm 3000 MHz ~ 12.75 GHz — –28 — dBm Intermodulation — — –33 — dBm Espressif Systems 24 Submit Documentation Feedback ESP8684-WROOM-04C Datasheet v1.4 7 RF Characteristics Table 26: Bluetooth LE - Receiver Characteristics - 125 kbps Parameter Description Min Typ Max Unit Sensitivity @30.8% PER — — –105.0 — dBm Maximum received signal @30.8% PER — — 8 — dBm C/I and receiver selectivity performance Co-channel F = F0 MHz — 3 — dB Adjacent channel F = F0 + 1 MHz — –7 — dB F = F0 – 1 MHz — –5 — dB F = F0 + 2 MHz — –35 — dB F = F0 – 2 MHz — –34 — dB F = F0 + 3 MHz — –38 — dB F = F0 – 3 MHz — –37 — dB F ≥ F0 + 4 MHz — –41 — dB F ≤ F0 – 4 MHz — –45 — dB Image frequency — — –41 — dB Adjacent channel to image frequency F = F image + 1 MHz — –43 — dB F = F image – 1 MHz — –38 — dB Table 27: Bluetooth LE - Receiver Characteristics - 500 kbps Parameter Description Min Typ Max Unit Sensitivity @30.8% PER — — –101.0 — dBm Maximum received signal @30.8% PER — — 8 — dBm C/I and receiver selectivity performance Co-channel F = F0 MHz — 4 — dB Adjacent channel F = F0 + 1 MHz — –6 — dB F = F0 – 1 MHz — –5 — dB F = F0 + 2 MHz — –29 — dB F = F0 – 2 MHz — –32 — dB F = F0 + 3 MHz — –31 — dB F = F0 – 3 MHz — –36 — dB F ≥ F0 + 4 MHz — –34 — dB F ≤ F0 – 4 MHz — –33 — dB Image frequency — — –34 — dB Adjacent channel to image frequency F = F image + 1 MHz — –37 — dB F = F image – 1 MHz — –31 — dB Espressif Systems 25 Submit Documentation Feedback ESP8684-WROOM-04C Datasheet v1.4 8 Module Schematics 8 Module Schematics This is the reference design of the module. 5 5 4 4 3 3 2 2 1 1 D D C C B B A A The values of L3, C11, C8, L2 and C9 vary with the actual PCB board. The values of C1 and C2 vary with the selection of the crystal. The value of R1 varies with the actual PCB board. R1 could be a resistor or inductor, the initial value is suggested to be 24 nH. NC: No component. Pin.13 NC Pin.12 IO18 Pin.11 NC Pin.9 NC Pin.10 NC Pin.14 NC PCB ANTENNA Pin.20 IO3 Pin.19 IO10 Pin.22 TXD0 Pin.21 RXD0 Pin.8 3V3 Pin.3 EN Pin.2 IO1 Pin.15 GND Pin.16 IO7 Pin.7 IO6 Pin.6 IO5 Pin.5 IO4 Pin.4 IO2 Pin.1 IO0 EPAD Pin.17 IO8 Pin.18 IO9 ESP8684-WROOM-04C(pin-out) 50 ohm Impedance Control GPIO4 GPIO5 GPIO6 U0RXD GPIO9 U0TXD CHIP_EN RF_ANT GPIO2 GPIO0 GPIO1 GPIO10 GPIO3 CHIP_EN GPIO7 GPIO8 GPIO18 GPIO5 CHIP_EN GPIO6 GPIO1 GPIO0 GPIO2 GPIO4 U0TXD U0RXD GPIO9 GPIO8 GPIO7 GPIO3 GPIO10 GPIO18 LNA_IN GND VDD33 VDD33 GND GND GND GND VDD33 GND GND GND VDD33 GND GND VDD33 GND VDD33 GND GND GND GND VDD33 VDD33 GND GND GND GND GND Title Size Page Name Re v Date: Sheet o f Confidential and Proprietary <02_ESP8684-WROOM-04> V1.1 ESP8684-WROOM-04 A4 2 2Monday, June 26, 2023 Title Size Page Name Re v Date: Sheet o f Confidential and Proprietary <02_ESP8684-WROOM-04> V1.1 ESP8684-WROOM-04 A4 2 2Monday, June 26, 2023 Title Size Page Name Re v Date: Sheet o f Confidential and Proprietary <02_ESP8684-WROOM-04> V1.1 ESP8684-WROOM-04 A4 2 2Monday, June 26, 2023 C1 TBD C9 TBD C3 1uF R1 TBD C13 10uF R9 10K(NC) D1 ESD R11 10K R3 10K(NC) C11 TBD C7 1.5pF C12 0.1uF L2 TBD C10 0.1uF L1 2.0nH(0.1nH) U1 26MHz(±10ppm) XIN 1 GND 2 XOUT 3 GND 4 C4 10nF ANT1 PCB_ANT 1 2 C14 1uF R2 499 C6 0.1uF C2 TBD L3 TBD C5 10uF(NC) U2 ESP8684 ANT 1 VDDA3P3 2 VDDA3P3 3 GPIO0 4 GPIO1 5 GPIO2 6 CHIP_EN 7 MTMS 9 MTDI 10 VDD3P3_RTC 11 MTCK 12 MTDO 13 GPIO8 14 GPIO9 15 GPIO10 16 VDD3P3_CPU 17 U0RXD 19 U0TXD 20 XTAL_N 22 XTAL_P 23 GND 25 GPIO3 8 VDDA 24 VDDA 21 GPIO18 18 C8 TBD Figure 4: ESP8684-WROOM-04C Schematics Espressif Systems 26 Submit Documentation Feedback ESP8684-WROOM-04C Datasheet v1.4 9 Peripheral Schematics 9 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 EN on the module is pulled up to VDD33 through a 10 K resistor, and connected to GND through a 1uF capacitor. EN IO3 IO4 IO5 IO6 3V3 EN IO9 IO7 RXD0 TXD0 IO8 IO10IO2 IO1 IO0 IO4 TMS IO5 TDI IO6 TCK IO7 TDO IO18 GND GND VDD33 GND GND GND VDD33 GND VDD33 JP2 Boot Option 1 1 2 2 C2 0.1uF SW1 C4 0.1uF R8 10K R2 0 JP1 JTAG 1 1 2 2 3 3 4 4 U1 ESP8684-WROOM-04C 3V3 8 EN 3 IO4 5 IO5 6 IO6 7 IO7 16 IO9 18 GND 15 IO8 17 RXD0 21 TXD0 22 IO3 20 IO10 19 IO2 4 IO1 2 IO0 1 EPAD 23 NC 9 NC 10 NC 11 IO18 12 NC 13 NC 14 JP4 UART 1 1 2 2 3 3 4 4 C1 10uF Figure 5: Peripheral Schematics • Soldering the EPAD to the ground of the base board is not a must, however, it can optimize thermal performance. 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 that the power supply to the ESP8684 chip is stable 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 (such RC delay circuit has already been built into the module). 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 ESP8684’s power-up and reset sequence timing diagram, please refer to Section Power Scheme in ESP8684 Series Datasheet. Espressif Systems 27 Submit Documentation Feedback ESP8684-WROOM-04C Datasheet v1.4 10 Module Dimensions 10 Module Dimensions 16±0.2 6 24±0.2 15.15 3.1±0.15 0.8 14 1.5 16 x 1.1 16 x 0.55 16 x 1.1 16 x 1.2 Unit: mm 0.93 11.865 2.8 0.55 2.8 6.8 1.6 10.14 Side View Bottom View 6 x 0.9 2 10 6 x 0.45 6 x 0.9 31.93 6 x 0.9 Top View 2 12.15 22 x Ø0.6 Ø0.5 Figure 6: Physical Dimensions Note: For information about tape, reel, and product marking, please refer to ESP8684 Module Packaging Information. Espressif Systems 28 Submit Documentation Feedback ESP8684-WROOM-04C Datasheet v1.4 11 PCB Layout Recommendations 11 PCB Layout Recommendations 11.1 PCB Land Pattern This section provides the following resources for your reference: • Figure for the recommended PCB land pattern with all the dimensions needed for PCB design. See Figure 7 Recommended PCB Land Pattern. • Source file of the recommended PCB land pattern to measure dimensions not covered in Figure 7. You can view the source files for ESP8684-WROOM-04C with Autodesk Viewer. Antenna Area 16 6 1.5 Unit: mm Copper Via for thermal pad 8.5 16 x 1.7 16 x 1.1 2 1.5 24 0.5 6 x 1.4 0.5 15.3 0.5 0.5 6 x 0.9 3 9 14 2 6.8 2.8 2.8 11.865 1.6 0.55 10.14 1 22 Figure 7: Recommended PCB Land Pattern Espressif Systems 29 Submit Documentation Feedback ESP8684-WROOM-04C Datasheet v1.4 11 PCB Layout Recommendations 11.2 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 ESP8684 Hardware Design Guidelines > Section Positioning a Module on a Base Board. Espressif Systems 30 Submit Documentation Feedback ESP8684-WROOM-04C Datasheet v1.4 12 Product Handling 12 Product Handling 12.1 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. 12.2 Electrostatic Discharge (ESD) • Human body model (HBM): ±2000 V • Charged-device model (CDM): ±500 V 12.3 Reflow Profile Solder the module in a single reflow. 50 100 0 150 200 250 200 100 50 150 250 Time (s) 217 25 Preheating 150 – 200 °C 60 – 120 s Ramp-up 25 – 150 °C 60 – 90 s 1 – 3 °C/s Soldering ＞ 217 °C 60 – 90 s Peak temperature: 235 – 250 °C Peak time: 30 – 70 s Soldering time: ＞ 30 s Solder: Sn-Ag-Cu (SAC305) lead-free solder Temperature (°C) 180 230 Cooling ＜ 180 °C –5 ~ –1 °C/s Figure 8: Reflow Profile Espressif Systems 31 Submit Documentation Feedback ESP8684-WROOM-04C Datasheet v1.4 12 Product Handling 12.4 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 32 Submit Documentation Feedback ESP8684-WROOM-04C Datasheet v1.4 Related Documentation and Resources Related Documentation and Resources Related Documentation • ESP8684 Series Datasheet – Specifications of the ESP8684 hardware. • ESP8684 Technical Reference Manual – Detailed information on how to use the ESP8684 memory and peripherals. • ESP8684 Hardware Design Guidelines – Guidelines on how to integrate the ESP8684 into your hardware product. • ESP8684 Series SoC Errata – Descriptions of known errors in ESP8684 series of SoCs. • Certificates https://espressif.com/en/support/documents/certificates • ESP8684 Product/Process Change Notifications (PCN) https://espressif.com/en/support/documents/pcns?keys=ESP8684 • Documentation Updates and Update Notification Subscription https://espressif.com/en/support/download/documents Developer Zone • ESP-IDF Programming Guide for ESP8684 – 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/ • 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 • ESP8684 Series SoCs – Browse through all ESP8684 SoCs. https://espressif.com/en/products/socs?id=ESP8684 • ESP8684 Series Modules – Browse through all ESP8684-based modules. https://espressif.com/en/products/modules?id=ESP8684 • ESP8684 Series DevKits – Browse through all ESP8684-based devkits. https://espressif.com/en/products/devkits?id=ESP8684 • 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 33 Submit Documentation Feedback ESP8684-WROOM-04C Datasheet v1.4 Revision History Revision History Date Version Release notes 2025-01-20 v1.4 • Table 1 Series Comparison: – Update the Ordering Code from ESP8684-WROOM-04C-H2 to ESP8684-WROOM-04C-H2X – Update the Ordering Code from ESP8684-WROOM-04C-H4 to ESP8684-WROOM-04C-H4X 2024-12-23 v1.3 • In Chapter 1 Module Overview, renamed 1.2 Description to 1.2 Series Com- parison • In Chapter 3.1 Pin Layout, Add annotations to the antenna keepout zone • Improved the structure, formatting, and wording in: – Chapter 4 Boot Configurations (use to be Section 3.3 Strapping Pins) – Chapter 6 Electrical Characteristics and 7 RF Characteristics (used to be Chapter 4 Electrical Characteristics) – Chapter 10 Module Dimensions and 11 PCB Layout Recommendations (used to be Chapter 7 Physical Dimensions and PCB Land Pattern) • Added Chapter 5 Peripherals • Added Chapter 11.2 Module Placement for PCB Design 2024-01-09 v1.2 Added an item about Bluetooth 5.3 certification in Section 1.1 Features. 2023-06-26 v1.1 • Updated 8 Module Schematics • Updated 9 Peripheral Schematics • Updated 10 Module Dimensions 2023-06-15 v1.0 • Updated Chapter 1.1 Features • Updated Chapter 11.1 PCB Land Pattern 2022-05-15 v0.5 Preliminary release 2022-11-15 v0.1 Draft Espressif Systems 34 Submit Documentation Feedback ESP8684-WROOM-04C Datasheet v1.4 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