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Visitor II
October 21, 2024
Question

Is there any STM32 MCU which has ADC with range higher than 3.3V ?

  • October 21, 2024
  • 3 replies
  • 757 views

I want to monitor my 4.2V battery and cant find any MCU which can convert such high voltage . It will be even better if it has differential ADC [can do 1.5-4.5].Previously tries STM32F303C8T6 but all the ADC pins are only 3.3V Tolerant. Its my first time posting so really don't know if i'm posting in the right page.

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    3 replies

    Graduate
    October 21, 2024

    No, but there are resistors, so you may make simple voltage divider... :)

    Graduate II
    October 21, 2024

    Generally no, you'd need to condition externally. Perhaps via a battery monitoring / charging IC?

    I vaguely recollect one that can measure VBAT/2

     

    Super User
    October 21, 2024

    @Soothertion wrote:

    I want to monitor my 4.2V battery 


    4.2V suggests lithium?

    Note that terminal voltage is a rather poor indicator of state-of-charge for lithium batteries.

    As @Tesla DeLorean suggested, a proper battery monitor chip would do better.

    For just terminal voltage, as @gbm said, you can use a simple potential divider - but beware that will put a drain on the battery...