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RTOS/CC3220SF-LAUNCHXL: CC3220 test power consumption is relatively large

allen wang17
Intellectual 430 points
Part Number: CC3220SF-LAUNCHXL
Other Parts Discussed in Thread: CC3120

Tool/software: TI-RTOS

e made ELOCK CC3220, follow CC3120, CC3220 SimpleLink ™ wi-fi ® Internet - on - a chip ™ Networking Subsystem Power Management test average Power consumption, burn power_measurement. Bin to the development board, UART print data and select (Always - Connected Current, 2000 milliseconds links interval), measured by the average Power consumption in 490 ua, and the data on the documents about 200 ua, as follows

Always-Connected Current, 500 ms link interval, the actual test power consumption is as follows

The information for the test platform and test development board is as follows

Could you please help me check if there is anything wrong with the setting or test method? Thank you

  • 0
    TI__Genius 15590 points
    Hi Allen,

    Please refer to section 2 of the CC3220 Power Management App Note: www.ti.com/.../swra502c.pdf
    This will help ensure your jumper configurations and pins you're measuring from are correct based on your measurement tool of choice.

    Thanks,
    Alexis
  • 0 in reply to Alexis Crandall20
    Intellectual 430 points

    Thank you very much for your reply, but we have read the document and tested it according to the above instructions. Could you please help me point out that there is something wrong with my configuration and operation?Thank you very much!

  • 0 in reply to allen wang17
    TI__Genius 15590 points
    Hi Allen,

    Can you describe your test setup and how you're making your measurements? It is hard to tell from the picture.


    Thanks,
    Alexis
  • 0 in reply to allen wang17
    TI__Mastermind 46211 points

    Allen,

    Table 4 in the Power Management Appnote (www.ti.com/.../swra502c.pdf) shows that the avg current consumption is 200uA/2000ms sleep interval.

    I believe what you are measuring, 500uA, and showing in your pictures is the avg consumption over time as the device is running the power_measurement example. See Section 2.5.2.3.

    Also, when evaluating the CC3220's low power modes,
    1) Keep in mind that your AP's DTIM interval can affect the device's sleep intervals (Table 3)
    2) Using UART and voltage translators on the LP will increase the avg current consumption.
    3) An SOP pull-up is not required when the device is in functional mode.

    -Seong

  • 0 in reply to Seong Kim
    Intellectual 430 points
    The test steps are as follows:
    1. Burning power_measurement. Bin into CC3220 LaunchPad
    2, remove jumper J19
    3. Connect the current test equipment
    4, With the USB cable connected and the CC3220 LaunchPad turned on
    5. UART prints out the data, select 5 (for always connected), select 2 (for LSI) in the second part, and select 2000msec in the third part.
    6. The average current of the test results is about 500 microamps, and the guidance document is over 200 microamps
  • 0 in reply to allen wang17
    TI__Mastermind 46211 points
    Allen,

    There are different things that will affect the current consumption such as your AP and the environment your test set up is in. The best environment to do your experiment in is in a shielded room or a room with minimal signal traffic.

    In always connected mode, the device is in LPDS and wakes up to receive packets so there will be a fluctuation from 135uA and 50mA. So the first thing I would validate is the LPDS current during LSI.

    Two extra steps I recommend is to:

    1) Modify your code so that the power_measurement example automatically puts the device in always connected mode (LSI, 2000ms) without user input. This eliminates the need for using UART and you can then remove all the isolation block jumpers.

    2) And remove the SOP pull up jumper shown in your LP's picture after you flash the aforementioned modified code. The device will boot in functional mode with the SOP configured as 000.

    Let me know how this affects your measurements.

    BR,
    Seong