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LP-CC2652R7: Startup Current Peak

Garvit Periwal
Prodigy 210 points
Part Number: LP-CC2652R7
Other Parts Discussed in Thread: CC2652R7, ENERGYTRACE,

Hi,

Is there a way to measure the startup current taken by CC2652R7 using energy Trace ? 

Currently, I am using a power profiler kit to measure that value and I am seeing peaks in range of 80-150 mA at startup. I want to confirm whether this inrush current is due to CC2652R7 or due to the extra components on launchpad.  The device I am using takes 100k samples per second for current measurement. 

Also is this peak at startup and expected behavior ? 

 

On Launchpad all the jumpers are removed for measurement and external power is provided from 3.3V side - 

Thanks,

Garvit

  • 0
    TI__Guru**** 216537 points

    Hi Garvit,

    You can expect a current peak at startup, due to charging of the CC2652R7 power system capacitors.  Here is an image of what it looks like in EnergyTrace

    Only CC2652R7 circuitry is measured, and the device is simply starting up, initializing application code, and entering standby mode during this time.  The peak (cropped out) is 20 mA but the LaunchPad measures 256 ksps.  This crest is perhaps about 20 us wide by my view.  This behavior will certainly change between custom board configurations, and keep in mind that the LaunchPad does have an additional external flash component populated (typically used to store application images for off-chip OAD solutions)

    Regards,
    Ryan

  • 0 in reply to Ryan Brown1
    Prodigy 210 points

    Hi Ryan,

    Can you tell me how you did this using energy trace?

    Currently, I am not able to see any startup peaks on my board when I take outputs using energy trace. I have taken the csv output from energy trace and plotted it in MATLAB but I don't see any startup peaks - 

     

    The peak at around 0.25 sec seems to be transmission peak and its value is around 10 mA -

     

    Thanks,

    Garvit

  • 0 in reply to Garvit Periwal
    TI__Guru**** 216537 points

    I am running EnergyTrace in standalone mode with only 3V3, GND, and RST jumpers connecting the CC2652R7 to the XDS110 on the LP-CC2652R7.  I hold the device in reset, start EnergyTrace capture, and release the device for operation.  Here are some resources you may find useful: 

    https://software-dl.ti.com/ccs/esd/documents/xdsdebugprobes/emu_energytrace.html 
    https://www.ti.com/lit/swra478 
    https://www.ti.com/lit/swra625 

    Regards,
    Ryan