Current consumption of 320uA after ble advertising stopped.

RE: Current consumption of 320uA after ble advertising stopped.

Surya — Wed, 16 Sep 2020 08:32:52 GMT

i am using pwr_mgmt_run()

RE: Current consumption of 320uA after ble advertising stopped.

Vidar Berg — Wed, 16 Sep 2020 07:47:47 GMT

130 uA is a bit unusual. I can't think of anything obvious that would lead to this base current. Are you using the same code as you described here: https://devzone.nordicsemi.com/f/nordic-q-a/65061/power-consumption-of-180-ua-during-low-power-system-on

RE: Current consumption of 320uA after ble advertising stopped.

Surya — Wed, 16 Sep 2020 06:26:59 GMT

I am unable to find out which causing power consumption. can you point out possible sources of current 125 uA to 130 uA

RE: Current consumption of 320uA after ble advertising stopped.

Vidar Berg — Tue, 15 Sep 2020 08:00:15 GMT

You should get around 2uA in System ON idle with the RC running and Softdevice enabled, so I think it must be something else.

RE: Current consumption of 320uA after ble advertising stopped.

Surya — Tue, 15 Sep 2020 07:57:56 GMT

I tried with the above settings, my code running without any issues but current consumption is 130 uA even I disabled the soft device.

1. is it current drawn by RC ?

2. how to stop it ?

RE: Current consumption of 320uA after ble advertising stopped.

Vidar Berg — Tue, 15 Sep 2020 06:49:57 GMT

Did you use the following clock settings when you enabled the Softdevice?

// </h> 
//==========================================================

// <h> Clock - SoftDevice clock configuration

//==========================================================
// <o> NRF_SDH_CLOCK_LF_SRC  - SoftDevice clock source.
 
// <0=> NRF_CLOCK_LF_SRC_RC 
// <1=> NRF_CLOCK_LF_SRC_XTAL 
// <2=> NRF_CLOCK_LF_SRC_SYNTH 

#ifndef NRF_SDH_CLOCK_LF_SRC
#define NRF_SDH_CLOCK_LF_SRC 0
#endif

// <o> NRF_SDH_CLOCK_LF_RC_CTIV - SoftDevice calibration timer interval. 
#ifndef NRF_SDH_CLOCK_LF_RC_CTIV
#define NRF_SDH_CLOCK_LF_RC_CTIV 16
#endif

// <o> NRF_SDH_CLOCK_LF_RC_TEMP_CTIV - SoftDevice calibration timer interval under constant temperature. 
// <i> How often (in number of calibration intervals) the RC oscillator shall be calibrated
// <i>  if the temperature has not changed.

#ifndef NRF_SDH_CLOCK_LF_RC_TEMP_CTIV
#define NRF_SDH_CLOCK_LF_RC_TEMP_CTIV 2
#endif

// <o> NRF_SDH_CLOCK_LF_ACCURACY  - External clock accuracy used in the LL to compute timing.
 
// <0=> NRF_CLOCK_LF_ACCURACY_250_PPM 
// <1=> NRF_CLOCK_LF_ACCURACY_500_PPM 
// <2=> NRF_CLOCK_LF_ACCURACY_150_PPM 
// <3=> NRF_CLOCK_LF_ACCURACY_100_PPM 
// <4=> NRF_CLOCK_LF_ACCURACY_75_PPM 
// <5=> NRF_CLOCK_LF_ACCURACY_50_PPM 
// <6=> NRF_CLOCK_LF_ACCURACY_30_PPM 
// <7=> NRF_CLOCK_LF_ACCURACY_20_PPM 
// <8=> NRF_CLOCK_LF_ACCURACY_10_PPM 
// <9=> NRF_CLOCK_LF_ACCURACY_5_PPM 
// <10=> NRF_CLOCK_LF_ACCURACY_2_PPM 
// <11=> NRF_CLOCK_LF_ACCURACY_1_PPM 

#ifndef NRF_SDH_CLOCK_LF_ACCURACY
#define NRF_SDH_CLOCK_LF_ACCURACY 1
#endif

RE: Current consumption of 320uA after ble advertising stopped.

Surya — Tue, 15 Sep 2020 06:38:59 GMT

with RC LF clock, i was able to init ble but when i am bond with android mobile i unable to do.

I got the following events,

BLE_GAP_EVT_CONNECTED

BLE_GAP_EVT_DISCONNECTED

but PM_EVT_PEER_DATA_UPDATE_SUCCEEDED is expected

RE: Current consumption of 320uA after ble advertising stopped.

Surya — Tue, 15 Sep 2020 06:06:22 GMT

Hi Vidar Berg, Thanks for your reply. I tried to stop and release the LF clock source using

ble_conn_params_stop() and

nrf_sdh_disable_request().

I also tried releasing LF clock Source nrf_drv_clock_lfclk_release(); but no use.

as you mentioned switching clock source to RC oscillator I am getting an error NRF_ERROR_SOFTDEVICE_NOT_ENABLED.

Are there any configuration changes I should do for using the RC oscillator?

RE: Current consumption of 320uA after ble advertising stopped.

Vidar Berg — Mon, 14 Sep 2020 17:13:33 GMT

Hello,

The Softdevice keeps the LF clock source active as long as it is enabled even if it is not in an active BLE role. But have you considered selecting the internal RC oscillator as the LF clock source instead? As noted in the Softdevice release notes, the synthesized option is not tested and thus not recommended.

Best regards,

Vidar