Hi,
We have a nrf5340 module on a custom PCB that is connected to a computer through use of a pcie header. This PCIE header allows USB communication to the module and supplies 3.3v. This 3.3v is boosted to 5v on the custom PCB for VBUS line, but VDD/VDD_H is supplied with the 3.3v power. Only other connections are for USB data lines.
For nReset the designer of this board put it directly to the PCIE reset pin, without any extra circuitry. This PCIE Reset Pin is only able to actively drive low/high. If this nReset pin is externally driven to 3.3v at all times, would this cause issues with the nrf5340 Module due to it having an internal pullup to 3.3v? Or is this fine? My assumption is that this is bad design and a transistor should be put on there to handle the input of the PCIE Reset to leave it set to GND or floating with asserted, but wondering if the change is necessary.
Thanks in advance! Let me know