RE: nPM1300 IBAT current measurement

AntonZ — Fri, 04 Apr 2025 08:06:26 GMT

Hi Tharaka,

Thanks for the information.
I just could not believe that it is as you described.

So we have to keep it in mind when working with this PMIC.

Thanks,
Anton

RE: nPM1300 IBAT current measurement

Tharaka — Fri, 04 Apr 2025 07:17:38 GMT

Hi Anton

The integrated current measurement of the nPM1300 is designed to meet the Fuel Gauge algorithm's requirements and is not intended for use as an accurate current measurement. The lower accuracy in measuring small discharge currents should not affect FG performance, as the algorithm uses battery current, voltage, and the battery model ( also NTC temperature if available) to estimate the state of charge.

Discharge current measurement is relatively inaccurate below 10 mA, which is why we intentionally display it as NaN in nPM PowerUP. If needed, you can disable this option using the command in Serial Terminal:
shell:~$ npm_adc ibat_filter disable

If your device’s discharge currents are well below 200 mA, we recommend setting IBAT_LIM to the LOW setting as described here:
https://docs.nordicsemi.com/bundle/ps_npm1300/page/chapters/charger.html#ariaid-title11

In PowerUP that setting is available in the CHARGER tab

This adjustment will further improve current measurement accuracy and optimize fuel gauge performance at lower discharge currents.

Hope this helps

Regards,

Tharaka