RE: PWR MGMT DEBUG PIN

Stian Røed Hafskjold — Tue, 27 Oct 2020 14:38:13 GMT

[quote user=""]1. Will this pin be set in all system sleep states? i.e System on and system off?[/quote]

It will only be set (high) in System ON idle. If you want it to be set in System OFF, you can add PWR_MGMT_DEBUG_PIN_SET(); before nrf_power_system_off() in nrf_prw_mgmt.c

[quote user=""]2. Can this pin be set to low, rather than high wen the system enters sleep mode?[/quote]

You will have to edit the nrf_pwr_mgmt.c file. On line 138 and 139 (SDK 17.0.2), the PWR_MGMT_DEBUG_PIN_SET/CLEAR() functions are defined. You can switch the nrf_gpio_pin_set/clear() functions.

[quote user=""]3. Will my setup of GPIOs prior to entering sleep mode affect the output of this pin in sleep mode? I set them all to default (not connected, no pull etc).[/quote]

I assume with "sleep mode" you mean "system OFF". If you set the pins to default (0x2) before entering system OFF, they will be high-z inputs and not be driven high or low.

[quote user=""]4. If this pin is not connected to any peripheral, will it affect the power usage of my device in system off?[/quote]

[quote user=""]5. Are there other pins, other than GPIOs which can be used as the PWR_MGMT_DEBUG_PIN?[/quote]

Only GPIOs can be used for this purpose. All the pins which do not have a specific purpose (like VDD, decoupling, DCDC, HF crystal, antenna etc..) are GPIOs.