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ychua
ychua
Associate
October 3, 2018
Question

STM32L452RE Nucleo Board

  • October 3, 2018
  • 2 replies
  • 494 views

​Based on STM32L452RE specification, it can support from 1.71V to 3.6V. I have try using external 3.3V power supply to power up the board. Q1, However when I change the voltage from 3.3V down to 1.8V, the reset signal voltage level change. At this point the board still can work. However when I change the voltage from 1.8V up till 3.3V, reset signal oscillate when the power supply is at 2.9V. If not wrong, this is due to auto power reset by the LSI. May I know what is the exactly cause of this? Is it possible to configure or prevent the oscillation at 2.9V?  Q2, Using 3.4V to power up the board, I found that the reset signal oscillate. Any causes for this as the spec indicate support up to 3.6V. Please advice. Thank you

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    2 replies

    Tesla DeLorean
    Tesla DeLorean
    Guru
    October 3, 2018

    Can't say I've dug into this, but the ST-LINK is likely running at 3V and controls the NRST pin.

    Perhaps check if there is a solder-bridge that disconnects the NRST, and see if still oscillates.

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    ychua
    ychuaAuthor
    Associate
    October 5, 2018

    Hi Clive, thank you for the advice. I have disconnects the solder bridge for the NRST signal. No oscillation occur after that.​

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