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

[Andy Sinclair]

Hmm, strange.  I see < 1uA on my setup.

Could you try forcing the BUCK modes please?

&npm1300_ek_buck1 {
	regulator-initial-mode = <NPM1300_BUCK_MODE_PFM>;
};

&npm1300_ek_buck2 {
	regulator-initial-mode = <NPM1300_BUCK_MODE_PFM>;
};

[kyozc]

Hi Andy

the build unsucceed after add the overlay in sdk v2.5.0

the nrf52840dk_nrf52840.overlay

/*
 * Copyright (c) 2023 Nordic Semiconductor ASA
 *
 * SPDX-License-Identifier: LicenseRef-Nordic-5-Clause
 */

&i2c0_default {
	group1 {
		bias-pull-up;
	};
};

&uart0 {
    status = "okay";
    current-speed = < 1000000 >;
    /* delete rts-pin&cts-pin to release the related 2 pins for other uses */
    /delete-property/ rts-pin;
    /delete-property/ cts-pin;
};

&npm1300_ek_buck1 {
	regulator-initial-mode = <NPM1300_BUCK_MODE_PFM>;
};

&npm1300_ek_buck2 {
	regulator-initial-mode = <NPM1300_BUCK_MODE_PFM>;
    regulator-init-microvolt = <3000000>;
	/delete-property/ enable-gpios;
	/delete-property/ retention-gpios;
	/delete-property/ pwm-gpios;
};

&npm1300_ek_ldo1 {
	/delete-property/ enable-gpios;
};

&npm1300_ek_ldo2 {
	/delete-property/ enable-gpios;
};

Our case: EK HWV: 0.9.1   DK HWV: 3.0.0    SDK:v2.5.0

[Andy Sinclair]

Hi Chen.

Could you add this to the top of your overlay and try again please:

#include <dt-bindings/regulator/npm1300.h>

Thanks
Andy

[kyozc]

Hi Andy ,

Still cann't buid succeed , attach is npm1300.h from sdk there was no NPM1300_BUCK_MODE_PFM 

/*
 * Copyright (c) 2023 Nordic Semiconductor ASA
 *
 * SPDX-License-Identifier: Apache-2.0
 */

#ifndef ZEPHYR_INCLUDE_DT_BINDINGS_REGULATOR_NPM1300_H_
#define ZEPHYR_INCLUDE_DT_BINDINGS_REGULATOR_NPM1300_H_

/**
 * @defgroup regulator_npm1300 NPM1300 Devicetree helpers.
 * @ingroup regulator_interface
 * @{
 */

/**
 * @name NPM1300 Regulator modes
 * @{
 */
/* Buck modes */
#define NPM1300_BUCK_MODE_AUTO 0x00U
#define NPM1300_BUCK_MODE_PWM  0x01U

/* LDSW / LDO modes */
#define NPM1300_LDSW_MODE_LDO  0x02U
#define NPM1300_LDSW_MODE_LDSW 0x03U

/* GPIO control configuration */
#define NPM1300_GPIO_CHAN_NONE 0x00U
#define NPM1300_GPIO_CHAN_0    0x01U
#define NPM1300_GPIO_CHAN_1    0x02U
#define NPM1300_GPIO_CHAN_2    0x03U
#define NPM1300_GPIO_CHAN_3    0x04U
#define NPM1300_GPIO_CHAN_4    0x05U

/** @} */

/** @} */

#endif /* ZEPHYR_INCLUDE_DT_BINDINGS_REGULATOR_NPM1300_H_*/

[Andy Sinclair]

Apologies, I am working on upstream Zephyr so forgot that this change was not in NCS2.5.

Another thing to try:

1. Remove the init-microvolt property, so that it uses the default value from the resistor

&npm1300_ek_buck2 {
    /delete-property/ regulator-init-microvolt;
};