Ship/Hibernate mode firmware logic

[Yaxit]

Hello,

I'm working with the npm1300, and I was recently trying to implement sleep/hibernate mode. The datasheet states that before entering these modes we should check if we are connected to VBUS. It is suggested that you check the register EVENTSVBUSIN0SET. however, as far as I understand, this register contains latching events.

For example, the event EVENTVBUSDETECTED is set when VBUS is inserted the first time, and then will be set until manually cleared with the register EVENTSVBUSIN0CLR. This means that checking the register before going to hibernate mode is not enough, and one needs to implement either some state of VBUS in firmware or get a bit more creative with events and interrupts (for example clearing EVENTVBUSDETECTED only when VBUS is removed). 

Could you please confirm that my understanding is correct? Is there an alternative register that just tracks the state of VBUS (and other things maybe) without the latching behaviour of the EVENTSET?

Thanks! 

[dacr]

Hi Yaxit,

You can read the VBUSINSTATUS register to check if USB is connected:

All the best,

Dan

[Yaxit]

Thanks, don't know how I missed this one. If this is the recommended method, maybe it should be updated on the datasheet :)

[runsiv]

To set it in shipmode you can do like in this thread https://devzone.nordicsemi.com/f/nordic-q-a/108668/wirelessly-setting-an-npm1300-pmic-in-ship-mode-thanks?ReplySortBy=CreatedDate&ReplySortOrder=Ascending 

you can also find the command here

Other then that I agree with Dacr, just checking the register is nice and easy 

Regards

Runar

[Yaxit]

I'm using a custom driver (the one in zephyr is not very flexible and complete).

I suggest updating the datasheet and refer to the STATUS register then instead of the EVT register. 

Thanks for the help!

[runsiv]

I will forward the feedback

Don't hesitate to create a new case if other questions pops up i the future

Regards and happy weekend

Runar