ESP32-S3-MINI-1-N4R2 safe pins
Posted: Tue Oct 28, 2025 10:35 am
Just to be sure I don't mess up on the project, on the S3-MINI-1-N4R2 i should be carefull with:
IO0,3,45,46: STRAPPING PINS. Operation described in Boot configuration on datasheet
RX0, TX0: Bootloader/debug UART
IO19,20: USB pins
IO26 - Don't use "For modules with ordering codes ending with -N4R2, IO26 connects to the embedded PSRAM and is not available for other uses."
IO33,34,35,36,37: Safe to use, since I'm not using 8LINE SPI mode (the module doesn't use this internally, neither me outside)
So in other words, for the S3-MINI-1-N4R2 pinout, I only need to worry about strapping pins (IO0,3,45,46);UART0;
Know that IO19,20 will be default configured as USB
Don't use IO26 at all.
All the other pins are free to use (But considering their glitches and capabilities). Correct?
IO0,3,45,46: STRAPPING PINS. Operation described in Boot configuration on datasheet
RX0, TX0: Bootloader/debug UART
IO19,20: USB pins
IO26 - Don't use "For modules with ordering codes ending with -N4R2, IO26 connects to the embedded PSRAM and is not available for other uses."
IO33,34,35,36,37: Safe to use, since I'm not using 8LINE SPI mode (the module doesn't use this internally, neither me outside)
So in other words, for the S3-MINI-1-N4R2 pinout, I only need to worry about strapping pins (IO0,3,45,46);UART0;
Know that IO19,20 will be default configured as USB
Don't use IO26 at all.
All the other pins are free to use (But considering their glitches and capabilities). Correct?