Battery Voltage Reading with a Voltage Divider on the nRF54L15 DK

RE: Battery Voltage Reading with a Voltage Divider on the nRF54L15 DK

Håkon Alseth — Fri, 28 Mar 2025 14:23:06 GMT

This is a very good catch! I can confirm that this is highly likely the root cause.

Kind regards,

Håkon

RE: Battery Voltage Reading with a Voltage Divider on the nRF54L15 DK

hmolesworth — Thu, 27 Mar 2025 20:55:08 GMT

AIN2 is pin P1.06 which on the nRF54L15DK is used as RTS and connects to a DG2788 analogue switch which will load the signal even when nothing is connected to RTS; this is the likely issue.

RE: Battery Voltage Reading with a Voltage Divider on the nRF54L15 DK

AhmedTarek — Thu, 27 Mar 2025 13:57:07 GMT

Hi Håkon,

I tried adding a capacitor, but it seems to have no effect.

When I changed the input analog channel to AIN4, I was able to measure the voltage correctly. However, the issue persists with AIN2.

Best regards,
Ahmed

RE: Battery Voltage Reading with a Voltage Divider on the nRF54L15 DK

Håkon Alseth — Thu, 27 Mar 2025 10:59:27 GMT

Hi,

Have you tried adding a capacitor, as described in this blog post?

Measuring Lithium battery voltage with nRF52

Kind regards,

Håkon