esp-dev-kits Choose target... Choose version... Debugging and Flashing Boards ESP-Prog ESP-Prog-2 User Guide Getting Started Description of Components Start Application Development Contents and Packaging Hardware Reference Block Diagram Header Block Related Documents Disclaimer and Copyright Notice H/W Reference ESP-Module-Prog-1(R) ESP-Module-Prog-SUB-02 ESP-Module-Prog-SUB-01&04 Resources and Legal Notices Related Documentation and Resources Disclaimer and Copyright Notice esp-dev-kits ESP-Prog-2 ESP-Prog-2 Download PDF ESP-Prog-2 [中文] This user guide helps you get started with ESP-Prog-2, and provides a detailed introduction to its features and capabilities. ESP-Prog-2 is a development and debugging tool released by Espressif. It supports functions such as automatic firmware downloading, serial communication, and JTAG online debugging. Automatic downloading and serial communication are supported on all Espressif chips, while JTAG online debugging is supported on all chips that provide JTAG interface. ESP-Prog-2 is simple in design and easy to use—only one USB cable is needed to connect it to a computer. The computer automatically recognizes two ports, one for downloading and the other for JTAG debugging, based on the port numbers. Considering that different target boards may operate at different voltages, both ESP-Prog-2 interfaces support either 5 V or 3.3 V power supply voltage. The voltage can be selected via jumper pins, providing compatibility with a variety of boards. However, while the power supply can switch between 3.3 V and 5 V, the RX/TX and JTAG signal levels are fixed at 3.3 V. ESP-Prog-2 (click to enlarge) The document consists of the following content: Getting started: Board overview, and hardware/software setup instructions to get started. Hardware Reference: More detailed information about the board’s hardware. Related Documents: Links to related documentation. Disclaimer and Copyright Notice: Link to the disclaimer and copyright notice. Getting Started This section introduces how to set up ESP-Prog-2 hardware for the first time. Description of Components ESP-Prog-2 - front (click to enlarge) The key components of the board are described in clockwise order. Key Components on ESP-Prog-2 Key Component Description ESP32-S3-MINI-1 The ESP32-S3-MINI-1 is a versatile Wi-Fi and Bluetooth Low Energy (BLE) MCU module. It features a variety of peripheral interfaces and comes with a PCB-mounted antenna. The core of the module is the ESP32-S3 chip. Reset Button Used to restart the target system being debugged. Boot Button Target system download button. Press and hold the Boot button, then briefly press the Reset button to enter the Firmware Download mode, allowing you to download the firmware to the target system via the serial port for debugging. It can be used as a confirmation button during normal operation. Boot On/Off Header pin used to configure the status of the IO0 Strapping pin. PROG PWR SEL Header pin used to select the program interface power supply input voltage (3.3 V or 5 V). PROG 2.54 mm Program interface with 2.54 mm (0.1”) pin spacing. PROG 1.27 mm Program interface with 1.27 mm (0.05”) pin spacing. USB Type-C Port The USB Type-C interface on the ESP32-S3 chip supports USB 2.0 Full-Speed mode, with a data transfer rate of up to 12 Mbps (Note that the interface does not support 480 Mbps high-speed transfer mode). This interface can be used as a power supply interface for the board, and supports communication with ESP32-S3 via USB protocol. JTAG 1.27 mm JTAG interface with 1.27 mm (0.05”) pin spacing. JTAG 2.54 mm JTAG interface with 2.54 mm (0.1”) pin spacing. JTAG PWR SEL Header pin used to select the JTAG interface power input voltage (3.3 V or 5 V). LED indicator Displays the status of ESP-Prog-2. There are three LED modes: red, green, and blue. The red LED is on when the system’s 3.3 V power is active; the green LED is on when the automatic firmware downloading and serial communication functions are in use; the blue LED is on when the JTAG online debugging function is active. ESP32-S3 Boot Button The ESP32-S3 download button for ESP32-S3 firmware downloading. To enter firmware download mode, power on the ESP-Prog-2 again while pressing the ESP32-S3 Boot button. Extension Connector Extension IO connector used to bring out the idle IOs of ESP32-S3. You can customize pins to extend the additional functionality of ESP-Prog-2. Start Application Development Before powering on, ensure the board is in good condition. Required Hardware ESP-Prog-2 USB-A to USB-C conversion cable A computer (Windows, Linux, or macOS) Dupont wires or the ribbon cable provided by Espressif to connect the development board and ESP-Prog-2 Note Be sure to use an appropriate USB cable. Some cables can only be used for charging, and cannot be used for data transmission or programming. Hardware Setup Connect the ESP-Prog-2 board to the PC USB port using a USB cable. Use the PROG PWR SEL or JTAG PWR SEL header pin to select the power supply output voltage for the Program interface or JTAG interface. Use the ribbon cable provided by Espressif to connect the ESP-Prog-2 debugging board to the Espressif target board. Use the Espressif official software tools or scripts to enable automatic downloading and JTAG debugging functions. Firmware Installation Before starting software development, it is recommended to update the built-in factory firmware of the ESP-Prog-2. This ensures the device run the latest features and bug fixes. Update firmware using online tool: Update ESP-Prog-2 firmware via Espressif’s online flashing tool ESP Launchpad following the steps below: Use a Chromium-based browser, such as Chrome. Press and hold the BOOT button closest to the module, and then connect the USB cable to put ESP-Prog-2 into firmware download mode. Open the ESP Launchpad page in your browser, and follow the instructions on the screen to connect and flash the firmware. Obtain the firmware source code: To understand the firmware implementation, check the firmware source code of ESP-Prog-2 at esp-usb-bridge. Software Setup To set up the development environment, please refer to Section Installation in Get Started with ESP-IDF. Contents and Packaging Retail Orders Each ESP-Prog-2 board comes in an individual package: ESP-Prog-2 Package Contents (click to enlarge) The package contents are as follows: Development board ESP-Prog-2 Data cable One cable is used for the PROG 2.54 mm interface, connecting the 2x5-PIN header. The other cable is used for the PROG 1.27 mm interface, connecting the 2x3-PIN header. If you order a few samples, each board comes in an individual package in either antistatic bag or any packaging depending on your retailer. For retail orders, please go to Get Samples. Wholesale Orders If you order in bulk, the boards come in large cardboard boxes. For wholesale orders, please go to Contact Sales. Hardware Reference Block Diagram The block diagram below shows the components of ESP-Prog-2 and their interconnections. ESP-Prog-2 Block Diagram (click to enlarge) Power Supply Options The development board has three incompatible power supply options: Default power supply via the ESP-Prog-2 USB port (recommended) Power supply via the 5 V and G (GND) pins Power supply via the 3.3 V and G (GND) pins Header Block The tables below provide the Name and Function of the pins on both sides of the board (Program Interface and JTAG Interface), and on the expansion connector. The pin names are shown in the front view of the ESP-Prog-2 board. The numbering is the same as in the ESP-Prog-2 Schematic (PDF). Program Interface No. Name Function 1 ESP_EN Enable signal 2 VDD Power supply 3 ESP_TXD TX pin 4 GND Ground 5 ESP_RXD RX pin 6 ESP_IO0 Strapping pin JTAG Interface Number Name Function 1 VDD Power supply 2 ESP_TMS JTAG TMS pin, mode selection 3 GND Ground 4 ESP_TCK JTAG TCK pin, clock input 5 GND Ground 6 ESP_TDO JTAG TDO pin 7 GND Ground 8 ESP_TDI JTAG TDI pin 9 GND Ground 10 NC No connection Extend Connector Number Name Function 1 I2C_SDA/OPTN_IO Configurable IO 2 I2C_SCL/OPTN_IO Configurable IO 3 GND Ground 4 SPI_HD/OPTN_IO Configurable IO 5 SPI_D/OPTN_IO Configurable IO 6 SPI_CS/OPTN_IO Configurable IO 7 GND Ground 8 SPI_CLK/OPTN_IO Configurable IO 9 SPI_WD/OPTN_IO Configurable IO 10 SPI_Q/OPTN_IO Configurable IO 11 VCC_5V 5 V Power supply 12 VCC_3V3 3V3 Power supply Related Documents ESP-Prog-2 Schematic (PDF) ESP-Prog-2 PCB Layout (PDF) ESP-Prog-2 Dimensions (PDF) For further design documentation for the board, please contact us at sales@espressif.com. Disclaimer and Copyright Notice See Disclaimer and Copyright Notice. Next Previous Suggestion on this document? Provide feedback Help improve this document? Edit on GitHub Need more information? Check ESP forum Sales Questions Technical Inquiries © Copyright 2016 - 2026, Espressif Systems (Shanghai) CO., LTD Built with Sphinx using a theme based on Read the Docs Sphinx Theme. esp-dev-kits Choose target... Choose version... Debugging and Flashing Boards ESP-Prog ESP-Prog-2 ESP-Module-Prog-1(R) ESP-Module-Prog-SUB-02 ESP-Module-Prog-SUB-01&04 Resources and Legal Notices Related Documentation and Resources Disclaimer and Copyright Notice Terms of Use for Development Board esp-dev-kits Disclaimer and Copyright Notice Download PDF Disclaimer and Copyright Notice [中文] 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. 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