nPM1300: How to turn on an LED

RE: nPM1300: How to turn on an LED

gocchan — Thu, 10 Sep 2026 06:48:55 GMT

Hi,

I removed the 750 ohm resistor and connected it directly to LED0, then cut the 5V line and connected it to VSYS, but the LED did not light up.

RE: nPM1300: How to turn on an LED

Priyanka — Tue, 08 Sep 2026 09:23:11 GMT

Hi,

Could you try to remove the resistors that you have used?

For eg, for LED0, please remove the 750 Ohm series resistor and connect the line directly to the nPM1300's VSYS raile, instead of 5V supply.

Please try this and let me know how it goes?

-Priyanka

RE: nPM1300: How to turn on an LED

gocchan — Tue, 01 Sep 2026 22:40:39 GMT

Hi Yanis,

I have confirmed that GPIO4's high/low output is possible using another command.
I checked the SCL/SDA voltage waveforms, and since Ack is being returned, I believe there is no problem with the I2C line.

Best regards,
Gotoda

RE: nPM1300: How to turn on an LED

yannisv — Tue, 01 Sep 2026 08:59:38 GMT

Hello,

Are you sure that you have active communication with the nPM1300, can you read/write other registers and verify those operations?

Best regards,

Yanis