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Tool/software:
Hi there,
I have designed a battery powered PCB with the BQ29732 for battery protection and the BQ51050b as the charger.
Charger and rest of the circuit is connected to the "pack" side of the BQ29732.
Circuit is working fine, charging is working fine as long as the battery doesn't run out.
But once the battery is depleted and Over-Discharge-Protection is triggered, I can't charge the battery using the BQ51050b anymore.
The BQ29732 has pulled the DOUT pin low. But when the charger wants to charge the battery the DOUT pin stays low. There's no current flow into the battery and the BQ51050b disables it's output. Apparently the "charger detection" of the BQ29732 doesn't detect the charging attempt or has to long of a delay.
Figure 8-1 shows a delay between "Charger connected" (bottom) and "Normal [operation] (top). Is there a timed delay?
It also shows voltage increase at the bat terminal immediately on connecting the charger but a delay until the DOUT pin is pulled high again.
I don't understand how battery voltage can increase when no current can flow into the battery due to the DOUT pin being pulled low.
Regards,
Michael
Ah for frolickings sake, I got the body diode directions confused!
The DOUT FET's body diode is in forward mode during charging. I'll go check out the BQ51050B part to figure out why it's not working...