Sleep when the button is pressed, and wake up after releasing the button?

RE: Sleep when the button is pressed, and wake up after releasing the button?

Jørgen Holmefjord — Wed, 19 Jul 2017 10:31:00 GMT

You can use an external pullup resistor. Configure the GPIO using NRF_GPIO_PIN_NOPULL:

nrf_gpio_cfg_sense_input(BUTTON_2, NRF_GPIO_PIN_NOPULL, NRF_GPIO_PIN_SENSE_HIGH);

Connect large resistor from GPIO to VDD. 1 MΩ will give you ~3 uA current draw (with VDD = 3V), when pushing the button.

RE: Sleep when the button is pressed, and wake up after releasing the button?

HelloWorld — Wed, 19 Jul 2017 09:16:45 GMT

If I can't change my requirement, is there a way to solve the problem to lower current draw of ~200 uA? e.g. like the current goes up for the sense but immediately goes back down to less than 10uA

RE: Sleep when the button is pressed, and wake up after releasing the button?

Jørgen Holmefjord — Mon, 17 Jul 2017 14:25:44 GMT

Hi,

The increased current is due to the pin being configured with pull-up resistor. When button is pressed, this will cause current draw of ~200 uA. Could you change your application to avoid having to hold the button, for instance by pressing once to stop RTC and one more time to wake from sleep?

Best regards,

Jørgen