Hardware Development; Esp32-H2 Modules; Esp32-H2 Development Boards; Download Guidelines - Espressif Systems ESP32-H2 Series Hardware Design Manuallines

4 Hardware Development

4 Hardware Development

4.1 ESP32-H2 Modules

For a list of ESP32-H2 modules please check
To review module reference designs please check

4.2 ESP32-H2 Development Boards

For a list of the latest designs of ESP32-H2 boards please check
website.

4.3 Download Guidelines

You can download firmware to ESP32-H2 either via UART or USB.
To download via UART:
1. Before the download, make sure to set the chip or module to Download Boot mode, i.e., strapping pin
GPIO8 (floating by default) is pulled high and pin GPIO9 (pulled up by default) is pulled low.
2. Power up the chip or module and check whether it has entered UART Download mode via UART0 serial
port. If the log shows "waiting for download", the chip or module has entered Download Boot mode.
3. Download your firmware into flash via UART using
4. After firmware has been downloaded, pull GPIO9 high or leave it floating to make sure that the chip or
module enters SPI Boot mode.
5. Power up the module again. The chip will read and execute the new firmware during initialization.
To download via USB:
1. Perform the download from step 3 if there is working program firmware in the flash. Otherwise, make sure
to set the chip or module to Download Boot mode, i.e., strapping pin GPIO8 (floating by default) is pulled
high and pin GPIO9 (pulled up by default) is pulled low.
2. Power up the chip or module and check whether it has entered UART Download mode via USB serial port.
If the log shows "waiting for download", the chip or module has entered Download Boot mode.
3. Download your firmware into flash via USB using
4. After firmware has been downloaded, pull GPIO9 high or leave it floating to make sure that the chip or
module enters SPI Boot mode.
5. Power up the module again. The chip will read and execute the new firmware during initialization.
Notice:
• It is advised to download the firmware only after the "waiting for download" log shows via serial ports.
• Serial tools cannot be used simultaneously with the Flash Download Tool on one com port.
• The USB auto-download will be disabled if the following conditions occur in the application, where it will be neces-
sary to set the chip to Download Boot mode first by configuring the strapping pin.
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ESP32-H2 Series Hardware Design Guidelines v0.5