KW36 wake up form VLLS3

[zhangxiwe]

hello!

I used MCU KW36Z512 chip and found that when debugging low power, set to VLLS2 and VLLS3, the system can not wake up, and when set to VLLS1, can normally wake up reset, do not know why!

[EduardoZamora]

Hi,

Just to confirm, are you using the FRDM board or is it a custom board?

Could you please help me with the version of the SDK you are using?

Once the application is running, which options are you selecting and what is the result?
For example, VLLS1 -> LPTMR -> 5 seconds: system wakes up normally.

Regards,
Eduardo.

[zhangxiwe]

Hi,

  I 'm using my custom board, my SDK version is V2.2.

     VLLS1--LPTIMR-->9 Seconds  system wakes up normally-->system is reset -->It's Good!

    VLLS3--LPTIMR-->9 Seconds  system wakes up normally, bus can't wakes up, system can't reset！--》It's fail!

Thanks!

[EduardoZamora]

Hello,

Just to be sure, are you planning to use the BLE features? If so, could you please help me by consulting these guides?

Kinetis MKW36 Power Consumption Analysis

Hardware Design Considerations for MKW35A/36A/35Z/36Z Bluetooth Low Energy Devices

Regards,
Eduardo.

[zhangxiwe]

Hello!

  Yes,I 'm using KW36 BLE, and  I had readed those guides!  found kw36 can't used VLL30;  OK! I try to use VLLS2 ,But the result same liked VLLSE3. Can't wake up !

   what can i do for it?

thanks ！

[EduardoZamora]

Hi,

Could you please tell me if your custom board design integrates a 32kHz external crystal?

Regards,
Eduardo.

[zhangxiwe]

Hello.

    Yes!  I used 32K crystal  for RTC   ,and 26M crtstal for  RADIO 。I will use I2C、SPI、LPtime、LLWU function。 I want to  my board can wake up from VLLS2 ,and not lost RAM data 。 In VLLS1 mode ,wake up for reset  lost RAM data!

  Thanks!

zhangxiwe_0-1653711429205.png

[EduardoZamora]

Hi,

Are you planning to use BLE together with low power? If so, please check the heart rate sensor (hrs) example inside wireless_examples/bluetooth from the SDK, it integrates both BLE and low power features. Please, let me know if you can run the application on your board and test it by using IoT Toolbox app in a mobile device.

Regards,
Eduardo.

[zhangxiwe]

Hi

     I am planing to use BLE with low power. But ,I didn't use Hrt sample. I will check it !

Thank!

[EduardoZamora]

Please, let me know any news once you have run your tests.

Regards,
Eduardo.

[zhangxiwe]

I am using the FRDM-KW36 / demo_apps / power_manager source.

zhangxiwe_0-1653462110093.png

     I can't find VLLS1 & VLLS3 different