Question about current in low power mode.

[psj]

Hi
softdevice uses s130
The board is using nrf51 dk. The example uses the ble_app_beacon example from sdk12.3.
   if (switch_hit ())
         {
           // NRF_POWER-> SYSTEMOFF = 1;
         // sd_power_system_off ();
          
         sd_ble_gap_adv_stop ();
          power_manage ();
     
         }
I measured the current by adding this part. I normally use 4.5mA, and when I enter the low power mode, it consumes 0.9mA. I thought I would spend much lower. Is this correct? Or am I making a mistake?

For reference, when I tested with system_on_wakeup_on_gpio example in GITHUB, I consumed 20uA when entering sleep mode.
I need your help.

[Hung Bui]

@Paek: Also please make sure you do a power reset before you do measurement, this is due to the NRF51 staying in debug mode after programming and will draw more current. 

[psj]

If it is a power reset, do you mean to just turn it off and on?

[Hung Bui]

If you are using GPIOTE IN interrupt, the current consumption will be around 1mA as the function require the HFCLK. If you want lower power , please use GPIOTE PORT interrupt instead. 

[psj]

Thank you. That was the problem.