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The
Vinpin of the MDBT42Q breakout goes to a regulator, and that regulator drops some voltage (don't want to look up right now, but probably couple hundred millivolts). If you use a battery (for example the CR2032) that's less than 3.6V, connect it to the3.3pin.And not exactly what you asked, but a motor - I assume it's running not only for milliseconds - even at 10-20mA is huge for a CR2023.
You should try somewhat bigger battery. Watch out for it's voltage! If it's below 3.6V, connect to the3.3pin, if it's over that, connect to theVinpin. For example, Li-ion, Li-poly must be connected to theVinpin. LiFePo4, CR123A can be connected to the3.3pin.
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.
user111953
Hi everyone,
I have a circuit with a PuckJS, a motor driver and a motor DC powered by the same CR2032 battery. I would like to replace the PuckJS with an MDBT42 but the MDBT42 crashes when the motor is powered. Everything works fine with PuckJS.
Does anyone know why ?
By the way the MDBT42 stop crashing if I add two big capacitors (1000uF 25V), one at board terminal, one at the battery terminal. But those capacitors are too big for the space I've got. I tried with smaller capacitors or just one but it doesn't work. I can't get why.
The motor draws 10-25mA.
Thanks a lot