VMA321 Lithium Battery Charging Board

I would like to use a thermistor on the VMA321. Pin 1 is for TEMP, and is tied to ground, as expected. I would sever the link, then tie the thermistor to the pin. Before I do, will I have any luck in achieving my goal, or is the use of a thermistor not possible?



Normally it’s not possible to do. But if you’ll will thermal protection (for more safety) you should to redesign the PCB to this:

With NTC in battery pack:

Schematic diagram of original VMA321 (without NTC) Rprog 1k2 = 1A:


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