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CC1310: Short bursts of current consumption in standby mode

sivan_toledo
Expert 1555 points
Part Number: CC1310

Hi, 

 I am trying to understand the current consumption of my CC1310 system when it is in standby mode (all TI-RTOS tasks are waiting, no interrupts being generated or serviced by my application; sensor controller is waiting for a GPIO event, but has no RTC). In this mode, I see short bursts of current consumption about every second. I assume that they represent pulses of the DC-DC converter. They look like a ramp up to about 220uA and then dying down; I assume that the pulse drops the voltage on the 22uF cap on VDDS and that the the current I'm seeing is the charging of this capacitor.

Does this seem like a plausible explanation of the current pulses, and will I be better off using the LDO in standby mode, in terms of total power consumption? (If it is possible at all to switch from the DCDC in active mode to LDO in standby).

Thanks, Sivan

  • 0
    Expert 1555 points
    Looking at the total current consumption in these bursts, they start at 200uA and drop down to close to zero after about 10ms, and given that they occur about once per second, I guess that the total average current consumption is about 1uA, which is what I would expect from a CC1310 in standby. So I guess all is good here.
  • 0 in reply to sivan_toledo
    TI__Guru**** 317180 points
    Yes, what you see is DCDC recharge pulses. VDDR has to be above the minimum level and the CC1310 calculates how many recharge pulses it has to use in a time interval. As you have noticed the average current consumption due to these pulses is low.