gpio disconnect and internal pull-up

[noseed]

hi 

I have leak current when GPIO disconnect.
When I tested it, the pull-up is a problem.

    /* Configure board. */
    nrf_gpio_cfg_input(11,NRF_GPIO_PIN_PULLUP);
    nrf_gpio_cfg_input(12,NRF_GPIO_PIN_PULLUP);
    nrf_gpio_cfg_input(24,NRF_GPIO_PIN_PULLUP);
    nrf_gpio_cfg_input(25,NRF_GPIO_PIN_PULLUP);
    
    nrf_gpio_cfg_input(12,NRF_GPIO_PIN_NOPULL);
    
    nrf_gpio_input_disconnect(24);

    nrf_gpio_cfg_input(25,NRF_GPIO_PIN_NOPULL);
     nrf_gpio_input_disconnect(25);
  
    while (true)
    {
                
       __SEV();
        __WFE();
        __WFE();
            
    }

Test the following current waveforms.

In the datasheet,

If disconnected, the internal pull-up should not be affected.

I tested with NRF52840, but nRF52832 also happens.

I wish someone would explain why.

thank you.

[Vidar Berg]

Hi,

The internal pull-up will continue to drive the output pin even if you disconnect the input buffer. So there seems to be an error in the illustration (figure 21). I will report this internally. Sorry for the confusion.