ESP32-S3 IO47 and IO48 as 1.8V UART?

[iwanttolearn]

Hi all! I've seen in the documentation of ESP32-S3-WROOM-1 that IO47 and IO48 pins on modules with PSRAM are set to 1.8V logic. Is it possible to do the same in modules without PSRAM, and then use these pins for UART connection to a GSM module that works at 1.8V?

[aliarifat794]

For modules without PSRAM, you would likely need to provide an external 1.8V regulator or a level shifter