NRF5340 reset pin pullup question

[pauleffect]

Hello.

Im designing a custom board for an ISP2053 (nRF5340 under the hood). The module schematic is as follows:

As far as I know, the nRF53 has the dedicated reset pin (nRST) pulled up - 13k resistance, internal pullup - so no external pullup is required. As I've read some posts about devices that have had issues with the reset pin (it was kept by the device at 0.3 - 0.4V instead of being pulled up), I added a DNP external pullup to the schematic. So, if the fickle gods of electronics decide to throw Murphy's Laws my way, I can add a resistor to the pcb post factum.

The only thing is I'm powering my device from a High Voltage LiPo directly, so I can't pull the Reset line up to VDD_BATT (which can reach 4.35V, way over the GPIO maximum voltage).

Is it ok if I use the VDD output of the MCU to pull the Reset line up, if needed?

[Priyanka]

Hi Paul,

I am looking int this and will get back to you by Monday.

Regards,

Priyanka

[Priyanka]

Hi Paul,

Yes, that should be fine to be used. Whenever there is power to the SoC, it will always be high.

Hopefully you won't need it because of the internal pullup, but you can use it to beware of Murphy. 

Regards,

Priyanka

[pauleffect]

Thank you kindly. I (briefly) looked at the schematics of the DK. There was an external pullup there, but disconnected via a solder bridge. So I'm sure you're right and it won't be needed. Thank you for your support.