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Power On reset behavior of STM32L071KZU3

Uma Sundaram
Associate

‎2018-05-16 07:29 AM

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.

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Tesla DeLorean
Guru

‎2018-05-16 07:59 AM

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.

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