SPIS current consumption

[Stephen Snyder]

We're using the nRF9160 with an external main microcontroller, and communicating with it over SPI.  We're evaluating the lowest power modes of our custom hardware to make sure there are no unknown sources of leakage.  Our observation is that with the nRF9160-DK, when nrf_spis_enable() is called before idling, our current consumption is at 13uA.  When this call is not made, it is closer to 1uA.

What is the expected current draw of leaving the SPIS block enabled during idle?  Does this keep certain clocks on?

Thanks!

[Kenneth]

Enabling a peripheral will typically increase current consumption, the amount will depend on the system state and possible other peripherals that are enabled or active at the same time. 13uA seems reasonable.

Kenneth