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MAmiri
Associate II
January 29, 2021
Solved

Do wakeup pins PA0, PC13 and PB3 on STM32WL55 require external pull-up?

  • January 29, 2021
  • 2 replies
  • 1067 views

I cannot find the external requirement for wakeup pins PA0, PC13 and PB3 on STM32WL55.

Do they need a pullup (e.g. 10K) to keep the output state once the MCU goes into one of the sleep modes?

Thanks

This topic has been closed for replies.
Best answer by Vangelis Fortounas

Hello

All GPIOs contain 40K PU/PD resistors. Some of them are maintained in Low pawer modes.

There are no special requirements for external pullups .

VILo , VIHi ,leakage current and other factors determine the max pullup/down resistors.

This is from DS

0693W000007DBKfQAO.jpg

2 replies

Vangelis Fortounas
Associate II
January 29, 2021

Hello

All GPIOs contain 40K PU/PD resistors. Some of them are maintained in Low pawer modes.

There are no special requirements for external pullups .

VILo , VIHi ,leakage current and other factors determine the max pullup/down resistors.

This is from DS

0693W000007DBKfQAO.jpg

MAmiri
MAmiriAuthor
Associate II
February 4, 2021

Thanks Vangelis Fortounas!