xESC2040 - Pull-up to 5V for 3.3V GPIO

ClemensElflein / xESC

The xESC is an easy to use, low cost electronic speed controller (ESC) design for sensored brushless DC (BLDC) motors.

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xESC2040 - Pull-up to 5V for 3.3V GPIO #5

Closed cajt closed 2 years ago

cajt commented 2 years ago

The inputs for the Hall-encoder are attached to 5V via pull-up resistors (R8, R9, R12). This will probably cause the ESD protection of the RP2040 to conduct the current to the +3.3V rail. Please add a note if this is intended and okay with the RP2040.

Suggested solution: With the assumption that he Hall-sensors have open-collector/open-drain outputs, use pull-ups to 3.3V instead of 5V.

ClemensElflein commented 2 years ago

Hi @cajt, thank you so much for the issue! Yes, the STM32 has 5V tolerant IOs and I forgot to adapt that interface. Canceled my PCB order and I'll fix it right away!