Detect Low Voltage while in Sleep and other times.

[CT_Engr]

I have suspended my Beacon in SLEEP (at .5 uA) until a keypress. Is there an event that can trigger an event if there is a low voltage detection while in SLEEP?

My goal is to wake up if the battery falls < 2.x volts so I can send a special coded advertisement.

If this is not possible, is there a routine that can give me a value so I can change my Minor value with if the voltage falls below a safe value. Then I will send it at intervals.

Where is the spec for this brown-out value ? 3.0v 2.x?

Thanks to all!

J

static void sleep_mode_enter(void)
{
    uint32_t err_code;
    //configure button 0 for wakeup
    nrf_gpio_cfg_sense_input(BSP_BUTTON_0, GPIO_PIN_CNF_PULL_Pullup, GPIO_PIN_CNF_SENSE_Low);	
    // Go to system-off mode (this function will not return; wakeup will cause a reset).
    err_code = sd_power_system_off();
    APP_ERROR_CHECK(err_code);
 }

 static void ble_evt_dispatch(ble_evt_t * p_ble_evt)
 {
    if(p_ble_evt->header.evt_id == BLE_GAP_EVT_TIMEOUT)
        sleep_mode_enter();
 }		

[Øyvind Karlsen]

Hi,

What you are looking for is the power on failure peripheral, which gives you an indication when the voltage has gone under a given level.

For some example code see this thread.

The comparator consumes about 10 uA, but is only enabled while the CPU is awake, which makes the comparator consume less than a uA for most BLE applications.

Best regards,

Øyvind

[CT_Engr]

Thank you for the great reply

John