topic Re: KL25Z low power demo Power Consumption in Kinetis Microcontrollers

KL25Z low power demo Power Consumption

asdasdaram — Mon, 10 Feb 2014 20:49:23 GMT

Hey out there, did someone try the following example on the FRDM-KL25Z board and measured also the current consumption of the different Low Power Modes

http://www.farnell.com/datasheets/1647950.pdf

My issue is that the current consumption is always round about 900 µA in VLLS0, VLLS1, LLS, VLLS3. But It should be much less and even less then 1 µA. I tried also different measurements, with Multimeters and shunt resistor. But it does not change. Did someone had this kind of trouble or do know how to fix it? I measure the Current between the Pins of J4. Just as in the app. note. In some other Modes its ok if the current goes higher then a mA

Thanks for help

Best regards

Re: KL25Z low power demo Power Consumption

gibbon1 — Tue, 11 Feb 2014 07:39:34 GMT

I haven't tried with the KL25. But from working on my own project it seems that one thing to be careful about is the Debug Interface. If that is enabled, the high speed clock will stay active in the low power modes.

Re: KL25Z low power demo Power Consumption

BlackNight — Tue, 11 Feb 2014 07:50:48 GMT

Measurement on the FRDM board can be tricky, and depends on the board revision. There are components on the boards (the debug interface is one of it) which impacts your measurement.

You might have a look at this article: Tutorial: Using the FRDM-KL25Z as Low Power Board | MCU on Eclipse

Re: KL25Z low power demo Power Consumption

jeremyzhou — Tue, 11 Feb 2014 08:23:42 GMT

Hi Asdasd,

I've like to suggest that you could use low_power_demo from KL25_SC to test the consumption of FRDM-KL25 while MCU enter LLS,VLLS0,VLLS1 and VLLS3.

The currrent consumption is also between the min and max which datasheet‘ve stated.

KL25_SC link： http://www.freescale.com/files/32bit/software/KL25_SC.exe?WT_TYPE=Lab%20and%20Test%20Software&WT_VENDOR=FREESCALE&WT_FIL…

If you have any other questions, please feel free to contact with me.

Have a nice day!

Best regards,

Ping

Re: KL25Z low power demo Power Consumption

asdasdaram — Tue, 11 Feb 2014 10:21:22 GMT

i have looked already at this article but it didnt help. I have RevD Version and measure over J4. Also im not debugging while going into Low Power modes.

Re: KL25Z low power demo Power Consumption

asdasdaram — Tue, 11 Feb 2014 10:23:35 GMT

I use the low_power_demo, exactly like in this manual. Also tried the version from KL25_SC. Its not a Software Problem.

http://www.farnell.com/datasheets/1647950.pdf

Re: KL25Z low power demo Power Consumption

jeremyzhou — Wed, 12 Feb 2014 07:19:40 GMT

Hi Asdasd,

Could you please send me the low_power_demo_freedom.srec then I could test the consumption on my board?

I'm looking forward to your reply.

Have a nice day!

Best regards,

Ping