current consumption about long press button

[hyman]

Hi,

        We use the nRF52810 to develop a HID controller, we use SDK 17.1.0 ,and the softdevice is S112 .

        We develop based on the example of 'ble_app_hids_keyboard' .everything is going ok .but when we test the power consumption ,we found when long press the button ,the curren consumption is about 270uA @3V  in customer PCB . Then we test the 'ble_app_hids_keyboard' example program in pca10040 EVB ,the current consumption is the same .

        We have another PCB of other product ,which also using nRF52810 ,we test the current consumption  is 45uA when long press the button .

        Could you please explain how to reduce the current consumption of long press button ?

        We have enable the DCDC power supply, We checked the example code ,the hi_accuracy is not enable .

nrf_drv_gpiote_in_config_t config = GPIOTE_CONFIG_IN_SENSE_TOGGLE(false);

[Håkon Alseth]

Hi,

 

but when we test the power consumption ,we found when long press the button ,the curren consumption is about 270uA @3V  in customer PCB

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

[hyman]

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 ?

        

Håkon Alseth said:

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

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

        Thanks .

[Håkon Alseth]

Hi,

 

hyman said:

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

Yes, that is correct.

hyman said:

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

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

 

Kind regards,

Håkon

[hyman]

OK，Thank you very much .