System power manager on Muons

Hardware
1

Hi,

I have this configuration on a Muon:

  SystemPowerConfiguration conf;

  System.setPowerConfiguration(SystemPowerConfiguration()); // To restore the default configuration before making changes

    conf.powerSourceMaxCurrent(900)
        .powerSourceMinVoltage(5080)
        .batteryChargeCurrent(1024)
        .batteryChargeVoltage(4208)
        .feature(SystemPowerFeature::PMIC_DETECTION);
    int res = System.setPowerConfiguration(conf);
    Log.info(" * * * * * power config API MODE setPowerConfiguration=%d", res);

I can see this applied since I observe:

0000003802 [app] INFO: * * * * * power config API MODE setPowerConfiguration=0

I am powering the Muon with 6v on DC Vin, exactly here:

image
image1654×768 65.8 KB

Since I configured .powerSourceMinVoltage(5080) , I was expecting the charging to stop when I reduce the input voltage to 5v, or 4.5v, but I can see the yellow charge LED still on.
It only shuts off when the voltage goes lower than 4.2v.

Why would that be?
Thanks!

2

If you look at the block diagram for the bq24195, the VIND (power source minimum voltage) control only controls the VSYS output, not the charge controller. I don't think that setting can be used to not charge below a certain voltage.

Screenshot 2024-11-02 at 2.35.54 PM
Screenshot 2024-11-02 at 2.35.54 PM952×1038 111 KB

3

Thanks.

Interesting, and if I wanted to do just that - stop charging when Vin is below a certain voltage?
Thanks again.

EDIT: from the docs

powerSourceMinVoltage
Set minimum voltage required for VIN to be used. This applies only when powered through VIN.

Note: I am powering the Muon ONLY through VIN.