Controller reset

ST MICROCONTOLLER · ‎2017-07-24

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.

li guodong · ‎2017-07-29

Posted on July 30, 2017 at 01:45

Add a tvs,you wiil have an amazing discovery.

Tesla DeLorean · ‎2017-07-29

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?

Tips, Buy me a coffee, or three.. PayPal Venmo
Up vote any posts that you find helpful, it shows what's working..

li guodong · ‎2017-07-30

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.

ST MICROCONTOLLER · ‎2017-08-08

Posted on August 08, 2017 at 07:57

We have used 104 pf.

Yes. We have added adequate capacitance on both sides.

ST MICROCONTOLLER · ‎2017-08-08

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.