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CC2640R2F: Current measurement - Launchpad CC2640R2F

Shailesh Joshi
Intellectual 380 points
Part Number: CC2640R2F

Hello,

my question can be broken down into two parts.

Firstly, I want to measure the power (current) consumption of a simple application I am developing using a Launchpad board. For this, I have taken the pinStandby application provided by TI and it works fine. I have removed the jumper over the GND pins and have routed the signal through a multimeter. I can measure a standby current of around 2mA which goes up slightly if the LEDs are ON. I am using the RTOS variant of the example. Is this value correct?

Second. I see that the RTOS supports a Standby mode for the chip. I could not find a simple example to test this. Ideally, I would like to see the chip draw a fraction of a mA to verigfy that it has indeed entered the Standby mode. I have read about modifying the examples to enter the Standby mode but could not get it to work. Could someone provide a simple step by step guide to verify the Standby mode or point me towards an existing solution? The tools I am using are standard, a Launchpad and a multimeter and no custom boarsd or similar.

Regards,

  • 0
    TI__Genius 10580 points

    Hello Shailesh,

    I would reccomend referring to the SimpleLink SDK Power Management, located at /ti/simplelink_cc2640r2_sdk_xx_xx/docs/tidrivers/Power_Management.pdf. This will guide you through the APIs and power policies of TI-RTOS. 

    For information on how to measure current consumption please refer to this document: Measuring CC13xx and CC26xx current consumption You should remove all jumpers to disconnect the XDS110 debugger from the device to get an accurate current measurement. 

    Regards,

    Daniel

  • 0
    Guru 85655 points

    Hi Daniel,

    From the document daniel_o shared you should use a DC power analyzer to measure current consumption. But, that Keysight DC power analyzer is expensive. 

    The standby current is not steady. If you are using a cheap multimeter you would not be able to measure this standby current due to resolution. However, if you have access to high end Fluke multimeter you would be able to measure the average standby current. I have done this before. The example program used for testing is simple peripheral disabling the advertisement after 5 seconds.

    -kel