ESP32-WROVER-IE burn fuse to set VDD_SDIO
Posted: Wed Mar 16, 2022 4:55 pm
Hi,
I have a esp32-wrover-ie and I am a little bit confused about the voltage of param and flash. From the docs I read "Internal pull-up resistor (R9) for MTDI is not populated in the module, as the flash and SRAM in the module only support a power voltage of 3.3 V (output by VDD_SDIO)." (https://www.espressif.com/sites/default ... eet_en.pdf page 7)
When I look into the Efuse I get:
So on what voltage is flash and param? 3.3 or 1.8V? When I pull gpio12 to HIGH or to GND nothing changes and the esp can start in both setups. Does that mean that gpio12 has nothing to do with the VDD_SDIO on the wrover-ie modules?
(Background information: I want to use gpio12 as normal gpio. So why not burn the VDD_SDIO to fixed voltage? It will never change anyway...)
One more question out of curiosity: When I flash the firmware I can see that the module version is V3. In the Efuse setup the silicon revision is 2. Is this right? Or do I have a fake module?
Best,
Jonathan
I have a esp32-wrover-ie and I am a little bit confused about the voltage of param and flash. From the docs I read "Internal pull-up resistor (R9) for MTDI is not populated in the module, as the flash and SRAM in the module only support a power voltage of 3.3 V (output by VDD_SDIO)." (https://www.espressif.com/sites/default ... eet_en.pdf page 7)
When I look into the Efuse I get:
Code: Select all
XPD_SDIO_FORCE (BLOCK0): Ignore MTDI pin (GPIO12) for VDD_SDIO on reset = False R/W (0b0)
XPD_SDIO_REG (BLOCK0): If XPD_SDIO_FORCE, enable VDD_SDIO reg on reset = False R/W (0b0)
XPD_SDIO_TIEH (BLOCK0): If XPD_SDIO_FORCE & XPD_SDIO_REG = 1.8V R/W (0b0)
(Background information: I want to use gpio12 as normal gpio. So why not burn the VDD_SDIO to fixed voltage? It will never change anyway...)
One more question out of curiosity: When I flash the firmware I can see that the module version is V3. In the Efuse setup the silicon revision is 2. Is this right? Or do I have a fake module?
Best,
Jonathan