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CC3220MOD: About the current consumption

Tao_2199
Genius 5660 points
Part Number: CC3220MOD

Hello,

 

Regarding to current consumption on CC3220MODSF12MOBR, my customer is asking some question.

They confirmed the current consumption data under operating of SL_START_API that is released from TI.

(Please attached pdf file.)

(Question)

(1) They confirmed some current pulses.

Could you please us explain why current pulses are occurred?

They think it will be occurred by calibration operation(24ms). Because the period is close to 24ms.

Their understanding is correct?

(2)They confirmed peak current (650~750mA: 120us pulse) before and after current pulse.

Could you please us explain why peak current are occurred?

They confirmed it on three modules, and some variation of peak current.

They have a concern of variation of peak current.

Because if this variation is large, battery operation will be affected.

Is it possible to estimate variation of peak current?

 

Regards,

Tao_2199

current waveform.pdf

  • 0
    TI__Mastermind 28285 points

    Hi Tao,

    the peaks you see are from the NWP initiliazing. The current for the NWP is listed in our datasheet. I would design your power supply to handle the peak current of the calibration, using a PMIC or buck-boost regulator. The current consumption on sl_Start should be same on every boot process.

    BR,

    Vince

  • 0 in reply to Vincent Rodriguez
    Genius 5660 points

    Hello Vince,

    Thank you for reply.

    I have additional question.
    (1) According to datasheet, the peak calibration current is 450mA(typ) at Vbat=3.3V but actual peak current is 650~750mA.
    Can we estimate max peak current?
    Why is accrual peak current so high comparing datasheet?

    (2)
    > The current consumption on sl_Start should be same on every boot process.
    Can we reduce peak calibration current in sl_Start API?
    (3)
    Could you please explain us how to reduce peak calibration current?
    (ex. Change to One-time calibration mode)

    Regards,
    Tao_2199

  • 0 in reply to Tao_2199
    TI__Mastermind 28285 points

    Hi Tao,

    What voltage are you using on the device? Do you have all proper capitance around the device as described in the reference design? There is no way to reduce the peak cal current, but you can reduce how often it happens by using the calibration modes. One Time will cal the device only on the first power up.

  • 0 in reply to Vincent Rodriguez
    Genius 5660 points

    Hello Adrian,

     

    Thank you for reply.

    They use 3.3V power as Vbat.

    > Do you have all proper capitance around the device as described in the reference design?

    Does the reference design mean TRM?

    I couldn’t find out capitance around the device in the TRM.

    But I could find the note(below) in CC3220MOD datasheet page 71(schematic).

    Do you mention about these capacitors?

     

    > One Time will cal the device only on the first power up.

    Can we change to one time mode in sl_Start API?

     

    Regards,

    Tao_2199

  • 0 in reply to Tao_2199
    TI__Mastermind 28285 points

    Hi Tao,

    Yes this looks correct. thanks. To configure one-time cal you can do it in the Unflash when you are configuring the image you want to flash to the device. Please review our Unflash User's guide for more info.

    https://www.ti.com/lit/ug/swru469h/swru469h.pdf?ts=1615988409736&ref_url=https%253A%252F%252Fwww.google.com%252F

  • 0
    Genius 5660 points

    Hello Vince,

     

    Thank you for reply.

    They have a small PCB size, which makes it difficult to add capacitors.

    So, they have an additional question.

    According to datasheet, the peak calibration current is 450mA(typ) at Vbat=3.3V but actual peak current is 650~750mA(Vbat=3.3V)..

    How much should the maximum current be estimated?

    Can we estimate max peak current?

     

    Regards,

    Tao_2199

  • 0 in reply to Tao_2199
    TI__Mastermind 28285 points

    Hi Tao,

    That current is more than what we would expect for calibration. Can you verify no other circuit is connected to where you are measuring?

    BR,

    Vince 

  • 0
    Genius 5660 points

    Hello Vince,

     

    Thank you for reply.

     

    They don’t connect other circuit at measuring.

    I have a question.

    > That current is more than what we would expect for calibration.

    How many currents is your mention you would expect for calibration?

    450mA(typ) (@Vbat=3.3V)?

     

     

    Regards,

    Tao_2199

  • 0 in reply to Tao_2199
    TI__Mastermind 28285 points

    Hi Tao,

    Yes the 450 mA is our datasheet value for typical, so thats what I would expect.

    BR,

    Vince