nPM1300: How to turn on an LED

[gocchan]

Hello, 

I've applied 5V to the anode of the LED, and the cathode is connected to the LED0 terminal of the nPM1300 via a resistor.

I've set the registers in I2C as follows, but the LED doesn't light up.
0x0A00 (LEDDRV0MODESEL): 2 (HOST)
0x0A03 (LEDDRV0SET): 1 (SET)

Is my procedure incorrect?

The circuit diagram is as follows:

Best regards, 
Gotoda

[yannisv]

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

[gocchan]

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

[Priyanka]

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

[gocchan]

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.