System power off current consumption in nrf51422

[soumil]

Hi,

We have built a BLE product using nordic nrf51422. When system power off mode is enabled, the current consumption is coming to be around 16 uA. In our application, we expect leakage current from different IC's to be 7uA. We are not sure on reason for the additional 9uA current. What could be the reason? Any help will be appreciated.

[Øyvind Karlsen]

Hi,

The current in system off is specified as 0.6 µA, alternately 1.6 µA if used in low voltage mode. Then you add 0.6 µA for each 8 kB block of RAM you retain. I would current draw from look pull resistors, diode leakage etc for the final µAs.

Best regards,

Øyvind

[soumil]

I am not retaining any of the RAM contents. I am using pstorage to retain data in flash memory. Any other reason on why we are getting high sleep current

[Øyvind Karlsen]

Are you able to test the current consumption of your code by flashing it to the development kit and measuring the draw there?

[soumil]

I will check that and get back to you

[soumil]

Hi Peter, i just loaded the heart rate example which uses the system low power mode and the current consumption is coming out to be 25uA. I don't think this is the value we expect. Is there something i am doing wrong.