Undervoltage Protection and Vout2 configration

RE: Undervoltage Protection and Vout2 configration

Andy Sinclair — Wed, 08 May 2024 07:13:35 GMT

Hi.

For question 2, I suggest entering ship or hibernate mode in this condition.
The host can send a TWI command to enter this state.

Andy

RE: Undervoltage Protection and Vout2 configration

Kazi Afroza Sultana — Tue, 07 May 2024 15:27:55 GMT

There is some details feedback from expert

Question 1 : The values of output voltage for the BUCKs that can be selected through the resistors on VSETx pins are in a limited range, so it is only the list of voltages listed in the table. There is no intermediate values that would not be listed in the table.

So, it's not possible.

Question 2 :

It seems you want to stop the BUCKs and the LDOs when the VBAT voltage is below 3.0V.

I think the POF feature (Power Fail Comparator) is here to do so: the internal comparator for POF detection monitors the voltage on VSYS (~VBAT in normal operation) and default value is 2.8V (typ) falling but the level is programmable, so you can set it to 3.0V.

RE: Undervoltage Protection and Vout2 configration

Kazi Afroza Sultana — Tue, 07 May 2024 15:21:21 GMT

Regarding 2:

battery voltage under thresold can damage the device. I can see a similar post here (+) Minimum battery voltage to allow charging (nPM1300) - Nordic Q&A - Nordic DevZone - Nordic DevZone (nordicsemi.com) you can look at.

you can look at this documentation https://infocenter.nordicsemi.com/topic/ps_npm1300/vbusin.html?cp=7_1_0_5_0_1#vbus-over-voltage. Under voltage protection for VBUS is 3.6V. VBUSOUT provides overvoltage and undervoltage protection for safe connection to the nRF device. Designs using the VBUSOUT pin as a supply must make sure the voltage level complies with the nRF device due to output resistance 7.5 ohm when VBUS is 5V.

RE: Undervoltage Protection and Vout2 configration

Kazi Afroza Sultana — Tue, 07 May 2024 13:04:51 GMT

Hello,

I have been looking into your case. I will get back to you soon.

BR
kazi

RE: Undervoltage Protection and Vout2 configration

erifat — Mon, 06 May 2024 07:43:43 GMT

Table VOUT2