RE: nRF5340 and nPM1300 – Fuel Gauge Update Frequency and Accuracy

runsiv — Wed, 15 Oct 2025 11:03:47 GMT

In general the fuel gauge iteration rate should follow the activity rate of the application. So if you are in for example a stable ble connection with a slow connection interval) you can run it every 5s instead of every second.
If the activity increases you will get more accurate results of the fuel gauge iteration rate also increases.

If current consumption is very low, typically low microamp range when only RTC is running, you can use the nrf_fuel_gauge_idle_set() function to inform the fuel gauge of the expected current consumption in this state (too low to measure accurately by nPM1300), and no further iterations are required until activity resumes.

We normally uses a 1 second iteration interval during battery discharge and 0.5 when charging.

We have also covered this a bit here

Regards

Runar