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LP-EM-CC2340R5: How to get lowest power consumption with basic ble example?

Frank(EP) Liu
Expert 4850 points
Part Number: LP-EM-CC2340R5
Other Parts Discussed in Thread: CC2340R5, LP-XDS110ET,

Hi,

I use CC2340R5 launchpad + basic ble example from simplelink_lowpower_f3_sdk_7_10_00_35.

I change the advertisement interval to 1sec. But I still can see small current peak from energy trace with 250ms interval.

Can I know how to eliminate or reduce it?

BR,

frank

  • 0
    TI__Mastermind 42250 points

    Hi Frank,

    Can you zoom into the small current peaks so we can see their profile? This may allow us to identify what may be going on. Do you have any periodic events occuring in the application? Besides changing the advertising interval has any other modification been made to the project?

    To measure the lowest power consumption possible, you will need to remove the LED jumpers and connect the LP-EM-CC2340R5 3.3V and GND pins to the LP-XDS110ET via jumper cables (only these two signals should be connected across the boards). In the code, you will need to disable the power module.

    Best Regards,

    Jan

  • 0 in reply to Jan
    TI__Expert 4850 points

    Jan,

    The zoom in is as below.

    I don't change any code from basic ble example project.

    yes, i already remove led and just jumper cable.

    not sure the meaning of "disable the power module". 

    I already use standby policy.

    I do another test. 

    enable LED when BLEAppUtil_Task 'NOT' get queue "BLEAppUtil_theardEntity". So, when BLEAppUtil_Task get queue, the current would drop to very low then only the current of queue.

    It shows the 250ms peak is not from BLEAppUtil_Task.  Is that from stack?

    BR,

    frank

  • +1 in reply to Frank(EP) Liu
    TI__Mastermind 42250 points

    Hi Frank,

    My apologies, I mistyped earlier and meant to say you will need to ensure the power module is enabled. If you have not made any changes, then this should be the case and based on your screenshots it should be good.

    The first image you shared seems to indicate that the spike is due to a VDDR recharge. This event is expected and discussed in Section 2 (image is shown in Figure 2-1) of the Measuring CC13xx and CC26xx Current Consumption.

    If this is the same event, then you can change the time between recharges by modifying how long the device is in standby for (by changing the advertising interval).

    Best Regards,

    Jan