nPM1300 USB/Charger default configuration

[Anuj Pathak]

We are designing a board around nRF54H20, and nPM1300, with some peripheral on VSYS, some on V3.0 BUCK2 and other are on V1.8 BUCK1. We also have detachable battery in place.
We would like to know if there is any other way like "hardware configuration without any I2C connection", or "OTP update through one-time I2C configuration" to achieve following requirements.

- Charger enabled by default with any default settings
- Default USB limit set to 500mA

Our board consumes more than 100mA on boot, and this could cause nPM1300 USB limit reset, before nRF54H20 can program it. We don't want to connect I2C in this case, and just use static configuration of.
Charger enabled by default and USB limit set to 500mA.


Regards

[Tomi Koskela]

Hello,

Unfortunately the default VBUS current limit setting is 100mA and would need to be programmed through TWI to 500mA. Would it be possible to disable one of the bucks at startup (connect VSETx pin to GND) and turn this on only after nRF54 is powered and VBUS current limit is programmed higher? Not sure how the powering of the peripherals is split between the rails, but something to consider as a workaround. If the battery is connected the device will be in supplement mode in the startup if VBUS is connected (VSYS is powered from VBUS and battery at the same time). Of course this does not help if the battery is drained.