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LP-CC2652RB: power consumption about chip reset

junde deng
Intellectual 280 points
Part Number: LP-CC2652RB
Other Parts Discussed in Thread: CC2652RB, ENERGYTRACE

Dear Ti:

I tested the power consumption at following platform with guide of Measuring CC13xx and CC26xx current consumption (Rev. D)

Board: CC2652RB development Kit

SDK: simplelink_cc13x2_26x2_sdk_4_30_00_54

example: D:\ti\simplelink_cc13x2_26x2_sdk_4_30_00_54\examples\rtos\CC2652RB_LAUNCHXL\ble5stack\simple_peripheral_oad_onchip\tirtos\ccs 

The test results as below: (Left: powerOn current.   Right: advertisement current(advInterval: 5s))

    

I have some questions about the results:

1. why there are 2 steps at the powerOn procedure, is that normal? And is there any way to remove the steps current?

2. At the advertisement current, why there are many small tips between 2 advertisements(the frequens is about 1s each 2 tips)? How can we remove the tips?

So many thanks to you!

  • 0
    TI__Mastermind 25810 points

    Hello,

    junde deng said:
    1. why there are 2 steps at the powerOn procedure, is that normal? And is there any way to remove the steps current?

    The initial steps are likely just the initial radio setup. If this only occurs once at startup, it should be negligible in terms of lifetime power consumption. I'm not sure there is a way to avoid this as it likely may be a required step that is performed by the stack. Since the stack code is unavailable, you may not be able to change this.

    junde deng said:
    2. At the advertisement current, why there are many small tips between 2 advertisements(the frequens is about 1s each 2 tips)? How can we remove the tips?

    Are you in a connected state? Advertising? I would check the application to see if there are any periodic events that could be triggering. Depending on the advertising interval, you could also be seeing recharge pulses (as outlined in the guide you linked). Take a look at the peak current when these tips occur, it will tell you if the device is in TX, RX, or if this is just an MCU wakeup (these values are outlined in the datasheet).

    Additionally, you can also connect via EnergyTrace++ to see the states your application is in during each peak. Here's a link to our Energy Trace User's Guide if you're interested.

  • 0 in reply to Ammar N
    Intellectual 280 points

    Thanks for your professional answer！

    In picture2, the device is advertising, not be connected yet.

    And Energy Trace is what I want, I will try it.

    Thanks again.

  • +1
    Intellectual 280 points

    In picture2, the 2 tips may cause by RC calibration and standby recharge.

      

  • 0 in reply to junde deng
    TI__Mastermind 25810 points

    Thanks for the update Junde. Yes, this is a potential cause. It's mentioned in some detail in the Measuring current consumption guide you linked earlier. This is located in section 2 under Standby.

    You can try setting a fast advertisement interval (10ms), and you should not see recharge pulses. This is because the device is waking up often enough to not have to go through this recharge stage. Unfortunately, a faster advertisement interval also means more power consumption. This will give you more information though on whether or not the pulses you see are associated with recharge.