nPM1300 Maximum discharge current limit

[AvihayZ]

Hello,

We are using nPM1300 in our project.

I would like to configure it to the maximum possible discharge current limit, as there are inrush currents in the board.

I have several questions:

1. In the PS it is mentioned that there are two discharge current settings - Low and High:
   
   While in Zephyr's driver (nordic,npm1300-charger.yaml) it is mentioned that the available range is 270 mA to 1340 mA in 3.23 mA steps:
   
   What is true?
   
   
2. When setting the dischg-limit-microamp to 1340000 (the maximum value according to the driver), the registers values are:
   BCHGISETDISCHARGEMSB = 207
   BCHGISETDISCHARGELSB = 0
   While according to the datasheet it should be BCHGISETDISCHARGELSB = 1.
   
   What value I should set to dischg-limit-microamp in order to achieve the maximum possible discharge current limit?

Thank you,

Avihay

[Jared]

Hi,

Only the 2 values listed in the product specification is officially supported. I agree that we need to update the yaml file to make that more clear. 

When setting the dischg-limit-microamp to 1340000 (the maximum value according to the driver), the registers values are:
BCHGISETDISCHARGEMSB = 207
BCHGISETDISCHARGELSB = 0
While according to the datasheet it should be BCHGISETDISCHARGELSB = 1.

What value I should set to dischg-limit-microamp in order to achieve the maximum possible discharge current limit?

What nRF Connect SDK Tag are you using? 1340000 Should be correct. 

Can you show me the dts/overlay where you apply this? 

regards
Jared 

[AvihayZ]

Hi Jared,

We are using tag v3.6.99-ncs2.

The charger configuration in the dtsi file is as below:

npm1300_charger: charger {
            compatible = "nordic,npm1300-charger";
            status = "okay";
            term-microvolt = <4100000>;
            term-warm-microvolt = <4000000>;
            current-microamp = <130000>;
            dischg-limit-microamp = <1340000>;
            vbus-limit-microamp = <500000>;
            thermistor-ohms = <10000>;
            thermistor-beta = <3435>;
            charging-enable;
        };

[Hung Bui]

Hi Avihay, 
Jared is away this week. I will try to help in the mean time. 
I think you should set the dischg-limit-microamp to 1000000. What's the value of BCHGISETDISCHARGELSB when you set the dischg-limit-microamp to 1000000 ? 

[AvihayZ]

Hello,

Thank you for the update.

When dischg-limit-microamp is set to 1000000, the values are:

BCHGISETDISCHARGEMSB = 154
BCHGISETDISCHARGELSB = 1