npm1300 IBAT = 0 and ADCIBATMEASSTATUS = 00

[dani_martin]

With a npm1300 I'm able to charge (for instance, the LED showing charging status is on, BCHGCHARGESTATUS is reporting the different steps..... ) but the battery current reporting is not working properly: IBAT always 0, and  ADCIBATMEASSTATUS is 00 (it should be 01 or 11).

If we measure the real current, it is a few mA, so it is just a matter of the npm1300 ADC or the reporting.

I'm reviewing all the configuration but I don't see anything....

Any idea?

Thanks!!

[Maria Gilje]

Hey Dani,

Our apologies for the delay. Michal is travelling this week, and will be back on Monday. Are you ok with waiting until then?

Best regards,

Maria

[dani_martin]

ok, let's wait until Monday. Thanks!

[Michal]

Hello,

sorry for the delay, I'm back in office and back to analyzing your issue.

I have checked the different configs and couldn't find anything obvious, registers like the ADCIBATMEASEN should look correct I think, but there is probably some config missing.

I have asked the experts about this, hoping they will find out something we both may have missed.

What happens when you trigger just a single measurement using ADCCONFIG instead?

Best regards,

Michal

[dani_martin]

Thanks for the answer. Let's see if the experts can find what is missing!!  

Yes, I get the same result in both ways of triggering the IBAT measurement: automatically after VBAT measurement (configured in ADCCONFIG) or manually (triggering it in TASKIBATMEASURE)

[Michal]

I got a question, are you writing to ADC.TASKVBATMEASURE register every time you want to make a measurement?

[dani_martin]

EEEYYY!!! It works. I was NOT triggering TASKVBATMEASURE manually. I thought that setting ADCCONFIG.VBATAUTOENABLE to true was enough.

Now I'm triggering manually TASKVBATMEASURE and it gives me VBAT and IBAT values.

Did I understand wrong the description of VBATAUTOENABLE? Or perhaps this mode is not triggering IBAT?

[Michal]

I'm checking internally about the details, but here is our sample code that you can look into:

https://github.com/NordicSemiconductor/npmx/blob/main/drivers/src/npmx_adc.c#L612