nrf52832 idle current is not 2uA

RE: nrf52832 idle current is not 2uA

Jørgen Holmefjord — Fri, 18 Dec 2020 17:56:27 GMT

Have you checked that these parameters are actually accepted by the peripheral? I tested this with the ble_app_rscs_c example in SDK 15.3.0, and I'm seeing ~11uA average current, but also BLE events occur every 1 second. This would explain the increased current consumption.

RE: nrf52832 idle current is not 2uA

Marshed — Mon, 14 Dec 2020 15:47:25 GMT

Hei,

I am testing it directly from the SDK with these changes in the main

int main(void)
{
    bool erase_bonds;

    // Initialize.
    //log_init();
    timers_init();
    //buttons_leds_init(&erase_bonds);
    power_management_init();
    ble_stack_init();
    gap_params_init();
    advertising_init();
    services_init();
    peer_manager_init();
    lpcomp_init();
    saadc_init();
    PWMinit();

    // Start execution.
    application_timers_start();
    advertising_start(erase_bonds);


    // Enter main loop.
    for (;;)
    {
        idle_state_handle();
    }
}

In addition the Bluetooth connection on the central device was set this way

static const struct bt_le_conn_param cp = {
		.interval_min = 100,
		.interval_max = 128,
		.latency = 98,
		.timeout = 3200,
	};

so that the connection interval will be around 16s. Do I need to disable NRF_LOG module or not initializing it is enough? If yes tell me where should I disable it.

I have looked into https://devzone.nordicsemi.com/nordic/power/w/opp/2/online-power-profiler-for-ble and the ideal current is supposed to be 2 uA, mine is around 8 uA. Can you suggest what else I am forgetting to switch off?

RE: nrf52832 idle current is not 2uA

Jørgen Holmefjord — Fri, 11 Dec 2020 13:05:10 GMT

Hi,

The sleep current will depend on which modules/resources are enabled in your application. Have you modified anything in the example, or are you testing it directly from the SDK?

Have you disabled the softdevice and all running libraries/modules before entering sleep? Typical modules that are enabled is the NRF_LOG module, application timer, etc. If the softdevice is enabled, you can find expected current consumption for different configurations through our Online Power Profiler for BLE

Best regards,
Jørgen