1.Would you please confirm the maximum ripple range that nrf52832 can accept for VDD (3.3V) and dec4 (1.3V) power supply, that is to ensure that the function will not be affected?
The power supply ripple test needs the corresponding judgment standard, and the relevant instructions are not found in the manual for the time being.
Ripple on VDD should be <100mVpp. DEC4 should not be a concern if the layout is done properly, but typically between 1.1V and 1.32V. Also DEC4 shall not be supplied externally or loaded.
Are there any parameters in the datasheet?
No, these are not in the datasheet.