Best way to provide power on/off option for BLE module.

[Alex]

Hello, what is the best way to provide optional enable or disable option for a user in terms of keeping BLE module powered on or off. I am thinking of 2 options , can you please share your opinion or maybe some thoughts which is the better way?

Option1: Adding P-channel mosfet that can be controlled by main CPU so that power to BLE module can be completely cutoff if necessary.

Option2: I have not tested this method yet but after little research I think theoretically it may work in my case: using sd_power_system_off() function versus NRF_POWER->POWEROFF = 1 commands to send device into shutdown mode, if power consumption in this mode is less than 100uA, I think this can be a winner because I do not need to use any extra parts to implement this.

Thank you.

[Kenneth]

Hi,

Both options works. I do not see any problems with option 2, the current consumption in system OFF is <1uA, so this should work very well for you. To wakeup from system OFF you can either use pin reset or wakeup on pin.

Best regards,
Kenneth