Hello everyone,
I have a simple battery charging circuit that seemed to be working perfectly, that is, until the battery was completely discharged, afterwards I'm unable to re-charge the battery.
Charging controller is a MCP73831/2
The battery is a tiny cheap 55mAh 3.7 V battery and the circuit is as follows:
I set everything according to the datasheet, being the 20k resistor on R3 for a 50mAh battery.
When the battery is fully charged it outputs 4.1V, after discharging it stays at 1.950V
Here's the deal, if I take out the battery and charge it somewhere else (let's say up to 3V) then put it back in my circuit, it keeps charging, but not on the circuit.
I'm not the most experienced in electronics and I'm out of ideas so I'm asking here as it seems the most appropriate place to do it:
What could the problem be?
Note: I think the problem may be related to the Undervoltage Lockout (UVLO), page 13 of the controller pdf.
///// EDIT
Unlike the battery specs say so, it does NOT have over-discharging protection, so the microcontroller will just keep trying to suck the battery dry.
I'm basically searching for a charging ic with over-discharging protection.
I have a simple battery charging circuit that seemed to be working perfectly, that is, until the battery was completely discharged, afterwards I'm unable to re-charge the battery.
Charging controller is a MCP73831/2
The battery is a tiny cheap 55mAh 3.7 V battery and the circuit is as follows:
I set everything according to the datasheet, being the 20k resistor on R3 for a 50mAh battery.
When the battery is fully charged it outputs 4.1V, after discharging it stays at 1.950V
Here's the deal, if I take out the battery and charge it somewhere else (let's say up to 3V) then put it back in my circuit, it keeps charging, but not on the circuit.
I'm not the most experienced in electronics and I'm out of ideas so I'm asking here as it seems the most appropriate place to do it:
What could the problem be?
Note: I think the problem may be related to the Undervoltage Lockout (UVLO), page 13 of the controller pdf.
///// EDIT
Unlike the battery specs say so, it does NOT have over-discharging protection, so the microcontroller will just keep trying to suck the battery dry.
I'm basically searching for a charging ic with over-discharging protection.
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