Sleep current while advertising

[AdamHCW]

With 900ms advertising interval we are seeing ~50uA sleep current on the 52840. How do we make it sleep with lower current? We are using an example project with an idle_state_handle call in the main, which calls nrf_pwr_mgmt_run, and executes a WFE. Is this the 17uA  ION_RAMON_GPIOTE sleep mode (on page 56 of www.nordicsemi.com/.../nRF52840PSv11pdf.pdf), or is there a different sleep mode we can enter? In other words, what is the lowest power sleep mode we can enter on the NRF52840 while still sending relatively infrequent connectable advertisements, and how do we go about doing this?

We are using softdevice s140_nrf52_7.0.1.

[Simonr]

Hi

Do you disable the radio entirely between each advertisement? Please make sure that if you have any other peripherals enabled, try disabling these before calling the idle_state_handle() function. It won't be efficient to go into system OFF mode, so I would think one of the ION_RAMON_ scenarios would be your best bet.

You can also check out this current consumption guide for nRF51 (which is still relevant for the nRF52 series) for a lot of common ways to reduce/optimize current consumption.

Best regards,

Simon