High current consumption in the Template Matter sample

RE: High current consumption in the Template Matter sample

Amanda Hsieh — Thu, 17 Jul 2025 20:33:23 GMT

Check out Short idle time and long idle time devices.

RE: High current consumption in the Template Matter sample

Tom McGuinness — Thu, 17 Jul 2025 05:31:40 GMT

Any other suggestions on the LIT configuration?

RE: High current consumption in the Template Matter sample

Amanda Hsieh — Wed, 16 Jul 2025 12:39:25 GMT

[quote user="Tom McGuinness"]That improved things. The one second spikes are gone now, but the radio is still turning on every 15 seconds, rather than 30.[/quote]

Good to hear that. Sounds like the one-second spikes are unrelated to the internal RC oscillator.

RE: High current consumption in the Template Matter sample

Tom McGuinness — Wed, 16 Jul 2025 08:19:12 GMT

Thanks Amanda,

I have checked the OPENTHREAD settings using menuconfig.

CONFIG_OPENTHREAD_MLE_CHILD_TIMEOUT=240

CONFIG_OPENTHREAD_CHILD_SUPERVISION_CHECK_TIMEOUT=190

CONFIG_OPENTHREAD_CHILD_SUPERVISION_INTERVAL=129

I believe this are the default values.

I had actually removed the CONFIG_OPENTHREAD_MTD setting, so I restored that! D'oh!

That improved things. The one second spikes are gone now, but the radio is still turning on every 15 seconds, rather than 30.

Unfortunately, setting CONFIG_CLOCK_CONTROL_NRF_K32SRC_RC_CALIBRATION to n as per the post resulted in a compilation error. I have got CONFIG_CLOCK_CONTROL_NRF_K32SRC_RC set to y.

/home/tomasmcguinness/ncs/v3.0.2/zephyr/include/zephyr/toolchain/gcc.h:87:36: error: static assertion failed: "MPSL requires clock calibration to be enabled when RC is used as LFCLK"
   87 | #define BUILD_ASSERT(EXPR, MSG...) _Static_assert((EXPR), "" MSG)
      |                                    ^~~~~~~~~~~~~~
/home/tomasmcguinness/ncs/v3.0.2/nrf/subsys/mpsl/init/mpsl_init.c:382:9: note: in expansion of macro 'BUILD_ASSERT'
  382 |         BUILD_ASSERT(IS_ENABLED(CONFIG_CLOCK_CONTROL_NRF_K32SRC_RC_CALIBRATION),
      |         ^~~~~~~~~~~~
/home/tomasmcguinness/ncs/v3.0.2/nrf/subsys/mpsl/init/mpsl_init.c:388:30: error: 'CONFIG_MPSL_CALIBRATION_PERIOD' undeclared (first use in this function)
  388 |         clock_cfg.rc_ctiv = (CONFIG_MPSL_CALIBRATION_PERIOD * 4 / 1000);
      |                              ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/tomasmcguinness/ncs/v3.0.2/nrf/subsys/mpsl/init/mpsl_init.c:388:30: note: each undeclared identifier is reported only once for each function it appears in
/home/tomasmcguinness/ncs/v3.0.2/nrf/subsys/mpsl/init/mpsl_init.c:389:34: error: 'CONFIG_CLOCK_CONTROL_NRF_CALIBRATION_MAX_SKIP' undeclared (first use in this function)
  389 |         clock_cfg.rc_temp_ctiv = CONFIG_CLOCK_CONTROL_NRF_CALIBRATION_MAX_SKIP + 1;
      |                                  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/tomasmcguinness/ncs/v3.0.2/nrf/subsys/mpsl/init/mpsl_init.c:390:22: error: 'CONFIG_CLOCK_CONTROL_NRF_CALIBRATION_TEMP_DIFF' undeclared (first use in this function)
  390 |         BUILD_ASSERT(CONFIG_CLOCK_CONTROL_NRF_CALIBRATION_TEMP_DIFF == 2,
      |                      ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/tomasmcguinness/ncs/v3.0.2/zephyr/include/zephyr/toolchain/gcc.h:87:52: note: in definition of macro 'BUILD_ASSERT'
   87 | #define BUILD_ASSERT(EXPR, MSG...) _Static_assert((EXPR), "" MSG)
      |                                                    ^~~~
/home/tomasmcguinness/ncs/v3.0.2/zephyr/include/zephyr/toolchain/gcc.h:87:51: error: expression in static assertion is not an integer
   87 | #define BUILD_ASSERT(EXPR, MSG...) _Static_assert((EXPR), "" MSG)
      |                                                   ^
/home/tomasmcguinness/ncs/v3.0.2/nrf/subsys/mpsl/init/mpsl_init.c:390:9: note: in expansion of macro 'BUILD_ASSERT'
  390 |         BUILD_ASSERT(CONFIG_CLOCK_CONTROL_NRF_CALIBRATION_TEMP_DIFF == 2,
      |         ^~~~~~~~~~~~

We're making progress!

RE: High current consumption in the Template Matter sample

Amanda Hsieh — Tue, 15 Jul 2025 19:56:55 GMT

[quote user="Tom McGuinness"]#1 I have set CONFIG_CHIP_ICD_SLOW_POLL_INTERVAL to 30000, but as you can see in the PPKII graph above, the radio seems to turn on every 15 seconds.[/quote]

To ensure that the SED device wakes up exactly at every poll period, set the following Kconfig options to the value greater than the poll period value (for Matter ICD CONFIG_CHIP_ICD_SLOW_POLL_INTERVAL):

See Child timeouts configuration.

[quote user="Tom McGuinness"]#2 There is a 3mA spike every one second. I have a single timer, configured to run at 10 second intervals. I configure the timer in AppTask::Init() and start it in AppTask::StartApp()[/quote]

Are you using the internal RC oscillator (CONFIG_CLOCK_CONTROL_NRF_K32SRC_RC=y)? If so, check out this post.

RE: High current consumption in the Template Matter sample

Tom McGuinness — Tue, 15 Jul 2025 05:32:18 GMT

I'm using NCS 3.0.2

I have followed that guide and made significant reductions. I'm not quite sure which setting removed the 500µA, but a pristine build resulted in the reduction.

That said, I still have two issues which I need help with.

#1 I have set CONFIG_CHIP_ICD_SLOW_POLL_INTERVAL to 30000, but as you can see in the PPKII graph above, the radio seems to turn on every 15 seconds.

#2 There is a 3mA spike every one second. I have a single timer, configured to run at 10 second intervals. I configure the timer in AppTask::Init() and start it in AppTask::StartApp()

CHIP_ERROR AppTask::Init()
{
...
k_timer_init(&sSensorTimer, &SensorTimerHandler, nullptr);
k_timer_user_data_set(&sSensorTimer, this);
...
}

CHIP_ERROR AppTask::StartApp()
{
	ReturnErrorOnFailure(Init());	

	k_timer_start(&sSensorTimer, K_MSEC(10000), K_MSEC(10000));

	while (true)
	{
		Nrf::DispatchNextTask();
	}

	return CHIP_NO_ERROR;
}

Could you help with these two questions?

RE: High current consumption in the Template Matter sample

Amanda Hsieh — Mon, 14 Jul 2025 18:08:11 GMT

Hi,

What NCS version are you using? Please check out this guide Reducing power consumption in Matter.

Regards,
Amanda H.

RE: High current consumption in the Template Matter sample

Tom McGuinness — Fri, 11 Jul 2025 16:36:38 GMT

I'm also seeing spikes every 15 seconds, despite the fact nothing is happening.

The config for ICD is

CONFIG_CHIP_ICD_IDLE_MODE_DURATION=300
CONFIG_CHIP_ICD_ACTIVE_MODE_DURATION=300
CONFIG_CHIP_ICD_SLOW_POLL_INTERVAL=300000
CONFIG_CHIP_ICD_FAST_POLLING_INTERVAL=500

I'd expect to see the spikes at 30 second intervals, matching the SLOW_POLL_INTERVAL