nRF52 battery monitor

[Bart de Kramer]

In the ULP Wireless Q magazine (edition winter 2016), on page 12 / 13 there is listed that the nRF52 chips have a Battery Monitor peripheral but I cannot find anything about it in the product specifications. Do you have more information about it?

[erltot]

Try SAADC (github example) and set SAADC sorce as NRF_SAADC_INPUT_VDD

my saadc callback:

void saadc_callback(nrf_drv_saadc_evt_t const * p_event){
    if (p_event->type == NRF_DRV_SAADC_EVT_DONE){
        uint32_t err_code;        
     
        err_code = nrf_drv_saadc_buffer_convert(p_event->data.done.p_buffer, SAMPLES_IN_BUFFER);
        APP_ERROR_CHECK(err_code);            
                
        nrf_drv_saadc_uninit();
        NRF_SAADC->INTENCLR = (SAADC_INTENCLR_END_Clear << SAADC_INTENCLR_END_Pos);
        NVIC_ClearPendingIRQ(SAADC_IRQn);
        float battery = (p_event->data.done.p_buffer[0] / 1023.0f) * 3.6f;
        
        char displaybuf[BLE_NUS_MAX_DATA_LEN];
        uint8_t chars = 0;
        chars = snprintf(displaybuf,BLE_NUS_MAX_DATA_LEN,"%.3f",battery);
        ble_nus_string_send(&m_nus, (unsigned char*)displaybuf, chars);
    }
}

[Bart de Kramer]

With the peripheral 'Battery Management' I was thinking about remaining power. This is what I'm realy interested in to give the customer an indication of remaining life time