nPM1300 normal mode quiescent current

[kyozc]

Hi Nordic,

According to the datasheet the nPM1300 normal mode quiescent current is about 800nA.

We can achieve that use nPM1300-EK when first power up.

But when we connect to pc use nPM PowerUP and disconnect. The  nPM1300-EK quiescent current will go up to 1mA.

And when we connect to nrf52840-DK And run npm1300_fuel_gauge example and disconnect. The nPM1300-EK quiescent current will go up to 3.7mA.

Is there any way to make the quiescent current below 1uA  without enter SHIP/HIBERNATE Mode ?

Thanks

[kyozc]

Hi Andy,

When use EK&PC , we see 1mA after disconnect from PC , when use EK&NRF52840-DK We see 1mA current all the time.

[Andy Sinclair]

Hi.

When it is in this state, could you do the following test to check if it is the software configuration that is causing the issue?

1. Hold the SHPHLD/RESET button on the EK for > 10 seconds to reset the PMIC.
    The current should drop.

2.  Press the reset button on the DK.
     Does the current rise to 1mA?

A couple of additional questions:
* How are you powering VBAT? (Battery / PPK / power supply)
* How are you measuring the current?

Thanks
Andy

[kyozc]

Hi Andy.

1. Hold the SHPHLD/RESET button on the EK for > 10 seconds to reset the PMIC.
    The current should drop.

Yes the current drop to <1uA

2.  Press the reset button on the DK.
     Does the current rise to 1mA?

Yes the current rise to 1mA

A couple of additional questions:
* How are you powering VBAT? (Battery / PPK / power supply)

Battery(Li-Po 320mAh)

* How are you measuring the current?

Digital Multimeter(DM3068) in series

Thanks
Chen

[Andy Sinclair]

Thanks Chen.

When running the fuel gauge sample, the current will rise to 1mA when the SoC is communicating with the PMIC via the TWI interface.

This will be a short pulse (approx 4ms) once a second.

I'm not sure how a meter will display this, so could you try disabling this communication in main.c:

	while (1) {
		// fuel_gauge_update(charger);
		k_msleep(SLEEP_TIME_MS);
	}

Thanks

Andy

[kyozc]

HI Andy

The current has no change after disable the fuel_gauge_update() still 1mA