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Iman Hosseinzadeh
Iman Hosseinzadeh
Associate III
August 15, 2018
Question

Several Wakeup Pins

  • August 15, 2018
  • 4 replies
  • 675 views

Hi All,

Is it possible to define wakeup pins other than WKUP0 and WKUP1 in STM32L152RC? I need to define three or more wakeup sources.

Thanks in advance.

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4 replies

I
Imen.D
ST Technical Moderator
August 16, 2018

Hello @Iman Hosseinzadeh​ ,

There are three WKUP pins (WUKP1, WKUP2 or WKUP3).

Please refer to the STM32L15xRC datasheet for more information.

With Regards,

Imen

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Tesla DeLorean
Tesla DeLorean
Guru
August 16, 2018

For a broader ranges of sources consider using external circuity to combine them

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Iman Hosseinzadeh
Iman HosseinzadehAuthor
Associate III
August 20, 2018

@Imen DAHMEN​ Thanks! I think the R series don't have the third wakeup.

@Community member​ Thanks. I added an OR circuit two combine two sources. When the MCU wakes up, is it possible to detect the source of wake up?

T J
T J
Senior III
August 20, 2018

do you pull to ground to wake up ?

you can use multiple diodes from many sources to pull that pin down...

use 4 diodes as a 4input OR gate

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