Understanding of Protection Circuit Module (PCM) protection for nPM1300

[Jayant Tang]

Hello DevZone,

I have some questions about nPM1300. I know that nPM1300 need a battery pack that already contains a PCM.

When the PCM activate the protection due to overdischarge, overcharge or overcurrent, how can nPM1300 deactivate this protection?

This can be broken to more small questions:

1. When the PCM activate the protection, the VBAT is 0V, is that correct?

2. When the VBAT is 0V, will the nPM1300 try to apply a voltage to the battery to remove the prortection status? Or do I have to set  BCHGVBATLOWCHARGE to start trickle charging?

3. I saw this errata. When the PCM needs a voltage higher than Vterm*0.95 to remove protection, we need to raise the Vterm... But I don't understand this, how can I control the voltage of trickle charging? And I noticed that this errata has been fixed in nPM1300 revision 2. So what is the behavioral pattern of nPM1300 revision2 in this situation?

Best regards,

Jayant

[ketiljo]

1. When the PCM activate the protection, the VBAT is 0V, is that correct?

Yes

2. When the VBAT is 0V, will the nPM1300 try to apply a voltage to the battery to remove the prortection status? Or do I have to set  BCHGVBATLOWCHARGE to start trickle charging?

The charger will source some current into the battery to try to open the protection. This should happen automatically.

3. I saw this errata. When the PCM needs a voltage higher than Vterm*0.95 to remove protection, we need to raise the Vterm... But I don't understand this, how can I control the voltage of trickle charging? And I noticed that this errata has been fixed in nPM1300 revision 2. So what is the behavioral pattern of nPM1300 revision2 in this situation?

This is only necessary for rev 1 devices. You can change VTERM in this register https://docs.nordicsemi.com/bundle/ps_npm1300/page/chapters/charger.html#ariaid-title26

No need to do anything for rev 2.