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ST MICROCONTOLLER
Visitor II
July 24, 2017
Question

Controller reset

  • July 24, 2017
  • 2 replies
  • 1518 views
Posted on July 24, 2017 at 11:11

I know it is a common question but still we cannot get rid of it. We are using stm8s003f3 in our project. An ac motor is switched ON and OFF by a 12V relay (using timer).

The controller frequently resets itself when a relay is tripped ON or OFF. We used pf on the controller pin, pulled up the NRST pin with a 10K and a pf, used 7805 instead of lm1117, and tried a few other things, but couldn't succeed.

It would be a great relief for us if anybody can provide solution for it.

THANK YOU.   
    This topic has been closed for replies.

    2 replies

    L
    li guodong
    Visitor II
    July 29, 2017
    Posted on July 30, 2017 at 01:45

    Add a tvs,you wiil have an amazing discovery.

    T
    Tesla DeLorean
    Graduate II
    July 30, 2017
    Posted on July 30, 2017 at 04:25

    What is 'pf' in this context? You've tried what? You have a schematic of what you've implemented?

    Do you have adequate bulk capacitance on either side of the regulator?

    L
    li guodong
    Visitor II
    July 30, 2017
    Posted on July 30, 2017 at 07:53

    just add a tvs

    in front of the power supply of mcu,in my sch the NRST pin  is 100nF,but the most  problem is EFT when the AC motor on or off.

    S
    ST MICROCONTOLLERAuthor
    Visitor II
    August 8, 2017
    Posted on August 08, 2017 at 14:21

    Ok. But can you suggest the value of tvs? I think 9 to 19V tvs is the most widely used one.

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