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CC2640R2F: high current when starting RF unit

JeanR
Intellectual 331 points

Part Number: CC2640R2F

Hi!

We are working with a CC2640R2F on a custom hardware with SDK 4.40.00.10.

Once the MCU gets triggered (red line in graph) the application is communicates with some onboard sensors and sends 5 BLE beacons at an intervall of ~150ms. After that the MCU is shut down again and waits for the next trigger.

When looking at the current consumption (blue line, using the TI XDS110 debug probe) I see a significantly high current once the RF unit is started (yellow circle) but not yet sending.

Is that normal behaviour or is something misconfigured there?

I am trying to reduce the overall consumption per triggered event and this part takes quite a bit of energy.

Thanks for any inputs!

Cheers

JR

  • 0
    TI__Guru**** 223677 points

    Hi JR,

    Based on the elapsed time and current consumed, this appears to be active MCU operation while the device is initializing the application and before it enters a low power mode.  This is normal behavior for the CC2640R2F device.  Please refer to SWRA478 for more information regarding measuring power consumption on SimpleLink devices.

    Regards,
    Ryan

  • 0 in reply to Ryan Brown1
    Intellectual 331 points

    Hi Ryan!

    Thanks for your prompt answer!

    Yes, I did read the SWRA478 beforehand.

    What triggered me is that the current adds up to much more than the datasheet says about max current of all the different peripherals. That would be somewhere around 2700 uA. Since other components onthe board take only 70uA continuously, that does not add up to the 3800uA I am seeing.

    Are there ways I can reduce this operating current?

    The reason why I am asking is that I see the supply voltage dropping significantly due to that peak current period which affects some of the functions. The supply is a coin cell battery and plenty of capacitors for buffering.

    Any ideas?
    Thanks!

    JR

  • 0 in reply to JeanR
    TI__Guru**** 223677 points

    Active Mode (MCU Running, No Peripherals) Current Consumption is benchmarked at ~3 mA for a VDDS of 3 V, and this value increases as the VDDS is decreased.  Please see figures 8-14/15 of the Datasheet.  This was also evaluated using a TI LaunchPad and could vary depending on your custom hardware configuration.  You can review the TI Drivers Power Management User's Guide and submit your design to SIMPLELINK-2-4GHZ-DESIGN-REVIEWS for further review.

    Regards,
    Ryan