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RTOS/CC1350: CC1350STK Problem with entering standby mode with standby example

YOYO
Prodigy 170 points
Part Number: CC1350

Tool/software: TI-RTOS

Hello,

I am currently testing the power consumption with multi-meter for CC1350 SensorTag.

When i run the example pinstandby code, the current is either 5mA(LED on) or 3mA(LED off) and it never go below 3mA.

However, when i use a brand new board with the default code, the current is about 0.3mA. The moment I replace the default code with the pinstandby one, the current goes back to 3mA. I have tried it with many other boards, and they all show the same result. I think the problem is with the code, but I have no idea what is going wrong.(I didn't change the pinstandby example code) . 

 Anyone knows what really happened here?

Thanks,

YOYO

  • 0
    TI__Guru**** 317180 points

    Note that the code does not set the sensors in low power mode. You have to first add code to set all the sensors in a low power stage before setting the CC1350 in low power mode.

    Edit: See for code that is required.

    Note that you can't have the debugger connected when doing these measurements.

  • 0 in reply to TER
    Prodigy 170 points
    Thanks!

    Shutting down sensors does help a lot. The measurement drops from 3+mA to 0.1 mA.

    However 0.1 mA is still much higher than what is claimed in the datasheet(0.6uA). Any idea about how to improve this??

    Thanks a lot!
  • 0 in reply to YOYO
    Guru 735685 points

    I would like to suggest you to use LAUNCHXL-CC1350 instead of CC1350STK to do this. It will make your life easier.

  • 0 in reply to YiKai Chen
    TI__Guru**** 317180 points
    I agree with YK here, to measure standby current the launchpad is a better choice since the STK is not primary developed as a low current platform.

    But in the thread I linked to we got the current down to 3.6 uA meaning that it could be that you either haven't implementing all the code correctly or your measurement are wrong. How do you measure the current?