I don't have low frequency crystal oscillator on my custom nrf 51822 board, and when i run ble-hrs example on it, I get around ~150uA advertising current, which is 5x to the current on DK?? Why is it so??

[Faizan]

Hi, I have made custom nrf 51822 board, I don't have LFCLK crystal i.e, 32.768khz. When i run ble_hrs example code in it , current consumption of my board goes to ~150uA while advertising, which is 5x more expected current while advertising ~30uA(If i am not wrong, i read it devzone).

When I run custom code my current consumption during advertisement goes to 1.32 mA.

Peripheral I'm using are:

ADC, UART, TWI, Software Timers, Button and storing the around 10 bytes of info in flash using pstorage.

Do i need to disable the peripherals manually are driver does take care of them??

Thanks and Regards, Faizan

[Stefan Birnir Sverrisson]

Hi Faizan

Start with going through the checklist in the nRF51 current consumption guide, "Troubleshooting" section.

Some general advise on disabling peripherals to save power is given on this thread. If you are using peripheral drivers in the most recent nRF51 SDKs, you can try to disable or uninitialize the peripheral drivers in order to see if that makes a difference on your custom board.