Too high current in stop mode. Power manager demo on frdm-kl25z.

[tuomasaaltio]

I measured supply current with the "power manager demo" on frdm-kl25z board (KL25Z128VLK). The current in Stop mode is much larger than I would expect. What could be causing this. Current measured from J4 on frdm-kl25z using multimeter.

mode:  current [mA]

run      9.3

wait      5.4

stop      4.7

vlps      4.7

[kerryzhou]

Hi Tuomas aaltio,

   When you test the low power, please download the code to your FRDM-KL25, then exit the debug mode, just check the current directly.

   I have test it on my side, it meet the demand.

RUN:6mA

WAIT:4.92mA

STOP:0.31mA

VLPS:10.2uA

All these data meet the datasheet demand:

My board version is:

700-27556 REVA

SCH-27666 REVE.

Wish it helps you!

Have a great day,
Kerry

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[tuomasaaltio]

I tested it with emulator disconnected, the result in RUN and VLPR mode are still too high.

RUN 8.9mA

VLPR 1.4mA

WAIT 5.0mA

STOP 0.4mA

My board version is:

700-27556 REV A1

SCH-27666 REV F.

[kerryzhou]

Hi tuomas aaltio,

  Please use this code for FRDM-KL25:

http://www.nxp.com/assets/downloads/data/en/lab-test-software/KL25_SC.exe 

After you download and install it, you can find the low power code in folder:kl25_sc_rev10\klxx-sc-baremetal\build\iar\low_power_demo

This code, run is 6.24mA, VLPR please use I, it is 0.22mA, in BLPI, this is the clock mode which is defined in the datasheet:

I have test the power consumption with the kl25_SC.exe in the same board reversion as you.

Please try this code again.

Wish it helps you!

Have a great day,
Kerry

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Note: If this post answers your question, please click the Correct Answer button. Thank you!
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[tuomasaaltio]

I debugged what happends in STOP. SMC_PMCTRL.STOPA bit is set in SMC_SetPowerModeStop() and function returns kStatus_SMC_StopAbort.