NRF52832 SYSTME OFF Power Influence

[tangyu]

Hi,

    I am using nrf52832 to achieve system-off with low power consumption.Nrf52832 and a rf IC communicate via SPI.

    I configured a pin as the wake pin.

    nrf_gpio_cfg_sense_input(11, NRF_GPIO_PIN_PULLDOWN, NRF_GPIO_PIN_SENSE_HIGH);

    and Call NRF_POWER->SYSTEMOFF = 0x1,when I need sleep.

    I found a problem with the wake pin and 3.3v short (always short) whenever I turned it on.The system can be turned on, I operate the rf IC to send data, but the rf IC will return the error of sending failure.When I disconnected the wake pin from 3.3v, the rf chip worked.

    My question is:

             When the wake pin is triggered, the microcontroller will enter a certain state of the waveguide power source larger?

             Or is it a mistake to simply attach 3.3v to the wake pin?If so, what to do?

    my rf IC is DW1000.

Thanks

[Stian Røed Hafskjold]

When the chip wakes up from system OFF, it starts in a reset state.

If you attach 3.3V to the wakeup pin you should disable the sensing and pulldown resistor when you are in system ON mode. Then configure the sensing and pull down right before going to system OFF and after you have removed the 3.3V from the wakeup pin. Have you configured any interrupts on the PORT event?

[tangyu]

thank you for the response.After modification, it runs normally.Other pins are used as interrupt pins and wake pins are not used as interrupts.What I do is I initialize the wake pin as normal input IO and pull it down.Configure it as nrf_gpio_cfg_sense_input before going to sleep.