nPM1100 LEDs

RE: nPM1100 LEDs

Kyrre Aalerud — Tue, 18 Jun 2024 11:56:27 GMT

I discovered this behavior can come about from low voltage on the bus (long thin cables) or overloaded usb port. Just in case others search and find this...

RE: nPM1100 LEDs

Kyrre Aalerud — Fri, 14 Jun 2024 10:15:57 GMT

Did this get resolved?
I can see from video the blinking was slow so I expect it was not same issue as I am now seeing.

I am getting an approx 10 Hz (9.65Hz) short spike of 400us length on CHG when battery has been full for a long time. I am using approx 157mA chargerate (2.4k ICHG resistor) and battery is a 320mAh cell. I can not see any spikes on VBUS, VBAT or VSYS.

It appears to only happen when battery is fully charged and have been so for a while.

RE: nPM1100 LEDs

Pallav Aggarwal — Thu, 05 Aug 2021 14:18:39 GMT

I have connected again for the measurements but this time, that blinking is not coming. Looks like the jumper wires could be the issue, not sure though.

I will do some more tests and confirm in a day or so.

RE: nPM1100 LEDs

ketiljo — Thu, 05 Aug 2021 08:29:32 GMT

Can you provide a scope plot of VBUS, VSYS and VBAT please?

RE: nPM1100 LEDs

Pallav Aggarwal — Wed, 04 Aug 2021 16:30:40 GMT

Battery is a new Phone battery and it gives good backup.

When LED is ON the voltage is 4.221V and when LED is off the voltage is 4.167V

Vterm is set for 4.2V

RE: nPM1100 LEDs

ketiljo — Wed, 04 Aug 2021 12:14:20 GMT

It should not do that. Can you try another battery? What it is the battery voltage when the LED is on and off?

It could be a battery with too high internal resistance such that, it reaches End of Charge, but when charging stop, the battery voltage drop below the Recharge Threshold

RE: nPM1100 LEDs

Pallav Aggarwal — Wed, 04 Aug 2021 10:36:07 GMT

After the charging of the battery is completed the charging LED is blinking on my npm1100 evaluation board. See this video.

https://drive.google.com/file/d/1ATLQPX6ChGGR10goviXvLP2WvXfDOKr-/view?usp=sharing

RE: nPM1100 LEDs

ketiljo — Wed, 04 Aug 2021 10:24:40 GMT

The CHG LED is active only when the battery is being charged and the ERR LED is active if there's an error condition. None of these are blinking. You can connect these signals to the host MCU, hence blinking will just make things difficult.

RE: nPM1100 LEDs

Pallav Aggarwal — Wed, 04 Aug 2021 10:11:58 GMT

I am talking about how blinking will happen when it will be OFF when it will be ON?

RE: nPM1100 LEDs

ketiljo — Wed, 04 Aug 2021 10:08:49 GMT

This is explained here: https://infocenter.nordicsemi.com/topic/ps_npm1100/chapters/charger.html#charging_indication and https://infocenter.nordicsemi.com/topic/ps_npm1100/chapters/charger.html#charger_error_cond