current consumption about long press button

RE: current consumption about long press button

hyman — Tue, 24 Jan 2023 08:44:46 GMT

OK，Thank you very much .

RE: current consumption about long press button

Håkon Alseth — Tue, 24 Jan 2023 08:40:50 GMT

Hi,

[quote user="hyman"]Is that mean that's using internal 13K pull-resistor ?[/quote]

Yes, that is correct.

[quote user="hyman"]We modify the NRF_GPIO_PIN_PULLUP to NRF_GPIO_PIN_NOPULL ,and then add an external pull-up resistor like 100k, right ?[/quote]

Yes, that will reduce the active current when the pin is pressed.

Kind regards,

Håkon

RE: current consumption about long press button

hyman — Tue, 24 Jan 2023 08:34:15 GMT

Hi,

Thanks for your reply .

The button GPIO config is as below :

static const app_button_cfg_t app_buttons[BUTTONS_NUMBER] =
{
	#ifdef BSP_BUTTON_0
    {BSP_BUTTON_0, false, BUTTON_PULL, bsp_button_event_handler},
    #endif // BUTTON_0

    #ifdef BSP_BUTTON_1
    {BSP_BUTTON_1, false, BUTTON_PULL, bsp_button_event_handler},
    #endif // BUTTON_1

    #ifdef BSP_BUTTON_2
    {BSP_BUTTON_2, false, BUTTON_PULL, bsp_button_event_handler},
    #endif // BUTTON_2

    #ifdef BSP_BUTTON_3
    {BSP_BUTTON_3, false, BUTTON_PULL, bsp_button_event_handler},
    #endif // BUTTON_3

    #ifdef BSP_BUTTON_4
    {BSP_BUTTON_4, false, BUTTON_PULL, bsp_button_event_handler},
    #endif // BUTTON_4

    #ifdef BSP_BUTTON_5
    {BSP_BUTTON_5, false, BUTTON_PULL, bsp_button_event_handler},
    #endif // BUTTON_5

    #ifdef BSP_BUTTON_6
    {BSP_BUTTON_6, false, BUTTON_PULL, bsp_button_event_handler},
    #endif // BUTTON_6

    #ifdef BSP_BUTTON_7
    {BSP_BUTTON_7, false, BUTTON_PULL, bsp_button_event_handler},
    #endif // BUTTON_7
};

if pca10040.h

#define BUTTON_PULL    NRF_GPIO_PIN_PULLUP

Is that mean that's using internal 13K pull-resistor ?

[quote userid="2115" url="~/f/nordic-q-a/95985/current-consumption-about-long-press-button/406163"]To minimize this current, use an external pull resistor instead with a higher value.[/quote]

We modify the NRF_GPIO_PIN_PULLUP to NRF_GPIO_PIN_NOPULL ,and then add an external pull-up resistor like 100k, right ?

Thanks .

RE: current consumption about long press button

Håkon Alseth — Tue, 24 Jan 2023 08:21:16 GMT

Hi,

[quote user=""]but when we test the power consumption ,we found when long press the button ,the curren consumption is about 270uA @3V in customer PCB[/quote]

Are you using internal pull-resistor in the GPIO PIN_CNF[] register?

If yes, then it is expected to see such a current draw, as the internal pull resistor is in the 13k (nominal value).

To minimize this current, use an external pull resistor instead with a higher value.

Kind regards,

Håkon