STM32L151CBT6A MCU, Enter stop mode have biggest power consumption - above 960uA, but datasheet is ~2..10uA ? And MCU not wake up from STOP by RTC WKUP

[AlexandrX]

Code of main cycle:

// Some "works"...
ipf("Works 5 sec\n\r");
HAL_Delay(5000);
 
// Prepare...
ipf("Power save STOP mode 5 sec\n\r");
double CounterVal = 5000 * 2.3125;
if (HAL_RTCEx_SetWakeUpTimer_IT(&hrtc, (uint32_t)CounterVal, RTC_WAKEUPCLOCK_RTCCLK_DIV16) != HAL_OK)
{
	Error_Handler();
}
HAL_SuspendTick();
 
// Enter STOP
HAL_PWR_EnterSTOPMode(PWR_LOWPOWERREGULATOR_ON, PWR_STOPENTRY_WFI);
 
// Exit, reconfig clocks & resume tick timer
SystemClock_Config();
HAL_ResumeTick();

LSI used by 37.0 KHz.

1. After HAL_PWR_EnterSTOPMode CPU goes to STOP, but POWER consumption ~960uA, why??

2. Why MCU not wakeup from RTC WKUP? Interrupt does not works...

[waclawek.jan]

If you have debugger connected, the processor core continues to run, consuming power, see DBGMCU_CR.

For wakeup, make sure you follow all these steps:

i.e. read out and check all relevant RTC and EXTI registers content.

JW

[AlexandrX]

If debugger connected power 960uA, after disconnect debugger - 810uA, bot not 2..10uA

RTC wake-up EXTI line 20 is Enabled.

RTC CR->WUTIE setted

RTC CR->WUTE setted

But not works...

And RTC Wake-up configured time to to wake-up by HAL_RTCEx_SetWakeUpTimer_IT

[Andrew Neil]

Do you have peripherals still active?

Are you sure that's all coming from the STM32 chip?

What else is on your board?

[AlexandrX]

SPI Flash Winbond W25Q127 onboard, and its all..

[Andrew Neil]

so what current is that drawing?

[AlexandrX]

Unsolder Winbond, and 4-8uA, supply Flash separately and 956uA...

[waclawek.jan]

> If debugger connected power 960uA, after disconnect debugger - 810uA, bot not 2..10uA

Did you power-reset after disconnecting debugger?

> And RTC Wake-up configured time to to wake-up by HAL_RTCEx_SetWakeUpTimer_IT

It's irrelevant that you've used some "library" function - since you've used it, it's part of your code thus your responsibility. Cube/HAL is open source so you can look at it, and you can check the registers content it changes.

Does the wakeup interrupt work without going to sleep?

JW

[AlexandrX]

I now check this...

Interesting, I set, for example 5 sec for WKUP, 5 sec power consumption is 4.5uA, after 5 sec some thing happens and current up to 145uA, but MCU not wake-up. If set 10 sec, then 10 sec 4.5uA and after 145uA, but, MCU not wake up...

[AlexandrX]

Without STOP WKAP still not works. REGs cheked all OK :(, ideas?