Skip to main content
Uma Sundaram
Uma Sundaram
Visitor II
May 16, 2018
Question

Power On reset behavior of STM32L071KZU3

  • May 16, 2018
  • 1 reply
  • 585 views
Posted on May 16, 2018 at 16:29

             We are using STM32L071KZU3 MCU in our design and providing 1.8V to VDD,VDDIO2 and VDDA domains of MCU.

         The on-board source voltage to MCU is exactly 1.78V(instead of 1.8V).

During power-up, we could see the reset pin of MCU is being held low.

   Also during power-up if we provide 1.82V to the MCU externally, the MCU reset is being released high.

Can you please let me know,how input voltage  influences MCU reset behaviour.

    This topic has been closed for replies.

    1 reply

    Tesla DeLorean
    Tesla DeLorean
    Guru
    May 16, 2018
    Posted on May 16, 2018 at 16:59

    There is a POR (Power On Reset) circuit that clamps NRST until the supply thresholds. I'm sure this is described/diagrammed in the Data Sheet, please try reviewing that.

    Tips, Buy me a coffee, or three.. PayPal Venmo (See Profile) Up vote any posts that you find helpful, it shows what's working..
    Terms & ConditionsAccessibility statement