Read registers out of npm1300 from nrf sdk

RE: Read registers out of npm1300 from nrf sdk

cjh39 — Sun, 04 May 2025 17:36:17 GMT

I'm also trying to communicate with the npm1300-CAAA, were you able to get any response from the I2C communications ? We are simply trying to read the status register, the battery voltage, and need to put it into ship mode. Our device is running, so I dont think the npm1300-CAAA is in some sort of low power mode.

RE: Read registers out of npm1300 from nrf sdk

dacr — Wed, 04 Sep 2024 08:20:11 GMT

Hi! Is npm1300 powered by anything else apart from battery? If not, as soon as battery voltage goes below POF(2.7V typ), nPM1300 will reset, and will not power back up until VBAT>VBATPOR (2.75V typ), hence any I2C read would return 0 as data.

RE: Read registers out of npm1300 from nrf sdk

Michal — Tue, 03 Sep 2024 17:12:28 GMT

Please take a look at zephyr/drivers/mfd/mfd_npm1300.c for more details.

For example:

int mfd_npm1300_reg_write(const struct device *dev, uint8_t base, uint8_t offset, uint8_t data)
{
	const struct mfd_npm1300_config *config = dev->config;
	uint8_t buff[] = {base, offset, data};

	return i2c_write_dt(&config->i2c, buff, sizeof(buff));
}

And in zephyr/drivers/regulator/regulator_npm1300.c you can find the list of some offset defines as well.

Best regards,

Michal

RE: Read registers out of npm1300 from nrf sdk

Michal — Thu, 29 Aug 2024 21:51:51 GMT

Hello,

I will look more into it and get back to you tomorrow. You can also take a look into the PMIC drivers, for example by debugging one of the nPM1300 samples.

Best regards,

Michal