ESP32-H2

[中文]

Note

This document is automatically translated using AI. Please excuse any detailed errors. The official English version is still in progress.

ESP32-H2 Chip/Module Startup Conditions

The operating voltage range of the ESP32-H2 chip is 3.0 V ~ 3.6 V; when using a single power supply, it is recommended that the power supply voltage for the ESP32-H2 series chip be 3.3 V, with a rated output current ideally at 350 mA or above. The operating voltage range of the ESP32-H2 module is 3.0 V ~ 3.6 V; when using a single power supply, it is recommended that the power supply voltage for the ESP32-H2 series chip be 3.3 V, with a rated output current ideally at 350 mA or above. The CHIP_PU (EN) pin of the ESP32-H2 is the chip’s startup pin. When CHIP_PU (EN) is at a high level, the chip is enabled; when it is at a low level, the chip is turned off. Note: The CHIP_PU pin must not be left floating. When the ESP32-H2 is powered by a 3.3V system power supply, the CHIP_PU (EN) pin must be at a high level.

Hardware Wiring

The ESP32-H2 supports two ways to download the firmware: UART0 and USB.

Hardware Connection

  • When downloading firmware based on the ESP32-H2 Module, for UART0, users need to prepare:

    • 3.3V Power Supply

    • Serial debugging tool

    • Dupont wire

    When using the UART0 pin to download firmware, the following wiring conditions need to be met:

    ESP32-H2

    3.3V External Power Supply

    Serial debugging tool

    3V3

    VDD

    GND

    GND

    GND

    EN

    VDD

    GPIO8 (pull-up, default is floating)

    VDD

    GPIO9 (pull down, default is high level)

    GND

    TXD0（GPIO24）

    RXD

    RXD0（GPIO23）

    TXD

Note

Upon powering up the chip, both GPIO8 and GPIO9 cannot be at a low level simultaneously.

  • When downloading firmware based on the ESP32-H2 Module, users need to prepare:

    • 3.3V Power Supply

    • USB cable

    • Dupont wire

    When using the USB pin to download firmware, the following wiring conditions need to be met:

    ESP32-H2

    3.3V External Power Supply

    USB cable

    3V3

    VDD

    GND

    GND

    GND

    EN

    VDD

    GPIO8 (pull-up, default is floating)

    VDD

    GPIO9 (pull down, default is high level)

    GND

    GPIO26

    USB_D- (White)

    GPIO27

    USB_D+ (Green)

  • When testing with the ESP32-H2 Development Board, you can directly use a USB Type-C cable to connect to the UART or USB interface on the development board for firmware download. If you are using the USB interface for firmware download for the first time, you need to manually pull down the GPIO9 pin, that is, hold down the Boot button and then power on, to manually enter the download mode.

Chip Power-On Startup Log

After powering on the ESP32-H2 chip/module, you can use the PC-side serial debugging software to view the UART0 serial output during chip power-up to confirm whether the chip has entered download mode. If the chip powers up and enters download mode, UART0 will print the following log:

ESP-ROM:esp32h2-20221101
Build:Nov  1 2022
rst:0x1 (POWERON),boot:0x4 (DOWNLOAD(USB/UART0))
waiting for download

Note

After powering on the ESP32-H2 chip/module, if you do not see the log printing, you can trigger the log printing by pulling down and then pulling up the CHIP_PU (EN) pin for a hardware reset restart.

In terms of software, Espressif provides a PC-based Flash download tool, which can directly download firmware (.bin) to Flash. For usage instructions, refer to the Flash Download Tool User Guide.

After the firmware download is complete, if you want to run the burned firmware, you can pull up GPIO9 (default is high level) based on the aforementioned hardware wiring, and then pull down and pull up the CHIP_PU (EN) pin for hardware reset and restart, allowing the chip to re-enter the Flash boot mode. Finally, use the serial debugging software to view the UART0 log printout to check the firmware running status.

Reference

Summary of Hardware Wiring Principles:

Official Documentation: