Please see Shawn's post: How to enter HIDOFF? How to detect if the request is not honored?
"GPIO:P0 should be pulled high (via 10k), or the key-scan feature of the device may think a key on a keyboard is pressed and it will stay awake to perform further scanning."
The cause of the device immediately aborting deep sleep is generally the physical state of P0.
Hi, I use that PIN as puart Tx pin on the SiP. Can i put an internal pull-up resistor?
Using an external resistor would be better.