MDBT42 crashes with motor powered by its battery

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user111953 in reply to @AkosLukacs

Thanks Akos !

I connected battery to the 3.3 pin and it seems to be better indeed, 100uF capacitors is now enough to prevent crashing.

Any idea to improve this ? And why the puck doesn't have this issue ?

And yes you are right about the CR2032 max drain. Actually it drains 10-20mA just during 2 seconds and a very very few times. I will change battery to a special one allowing high drain but first I really would like to make the MDBT42 as stable as the Puck. I need the circuit to hold as much as possible with end-of-life batteries.

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Robin in reply to @user111953

Sat 2021.05.15

re post #4: 'And why the puck doesn't have this issue ?'

Likely the regulator U2 MCP1703T

See schematic link below heading 'Information'

http://www.espruino.com/MDBT42Q

See schematic ('Circuit Diagram') link(s) below heading 'Information'

http://www.espruino.com/Puck.js

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