RE: low power consumption issue

Hung Bui — Wed, 29 Nov 2017 09:49:43 GMT

Hi Pavan,

How did you measure current consumption ? Note that with the current DCDC refresh mode, a simple multimeter can't measure current precisely. Have a look here.

The power profiler kit is recommended.

This:

When we put the application to System ON Low power mode (using power_manage() function) and by disabling display, stopping BLE advertisement, and ADC sampling every 10 sec, the current consumption drops further to 6mA.

Suggesting that the CPU might not be in sleep mode. You may need to check if there is any interrupt that keeps the CPU awake.

How do you do PWM ? If you use a TIMER that requires HFCLK, you will have higher current consumption (~1 milliamp)

You also need to make sure the device is not in debug mode when you measure current. Right after programming the board will stay in debug mode, you would need to do a power rest before measurement.

You can start your test by disabling all modules, put CPU to sleep and check if the current consumption would be at a few uA or not. Then start turn on one module at a time and see what cause the high current consumption and if it matches with the spec or not.