User's Manual

2.4.Pin Definitions
Note:
1. Firmware can configure register bits to change the settings of ”VDD_SPI Voltage”.
2. Internal pull-up resistor (R1) for IO45 is not populated in the module, as the flash in the module works at 3.3 V by
default (output by VDD_SPI). Please make sure IO45 will not be pulled high when the module is powered up by
external circuit.
3. ROM code can be printed over TXD0 (by default) or DAC_1 (IO17), depending on the eFuse bit.
4. When eFuse UART_PRINT_CONTROL value is:
0, print is normal during boot and not controlled by IO46.
1 and IO46 is 0, print is normal during boot; but if IO46 is 1, print is disabled.
2 and IO46 is 0, print is disabled; but if IO46 is 1, print is normal.
3, print is disabled and not controlled by IO46.
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ESP32-S2-WROOM & ESP32-S2-WROOM-I User Manual V0.5