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CC2340R5: Regarding the SWDIO and SWCLK leakage issues on my custom board.

Weli
Expert 1085 points
Part Number: CC2340R5

Tool/software:

Hi Expert.
I have a very strange problem,
We made a customized board ourselves, and recently we are going to mass produce it.
When we tuned the power consumption, I used the empty project to write a power shutdown. During the power shutdown, I found that after I executed the power shutdown, if my SWDIO and CLK were connected to XDS110 and not connected, there would be a difference in power consumption. I wonder if you have any suggestions for this.

There will be approximately several uA gaps.
But I have reserved test points for SWDIO and SWCLK for FW update.
So I feel very strange.

  • +1
    TI__Guru**** 171074 points

    Hi,

    Weli said:
    During the power shutdown, I found that after I executed the power shutdown, if my SWDIO and CLK were connected to XDS110 and not connected, there would be a difference in power consumption. I wonder if you have any suggestions for this.

    If the device was connected to a Debug Probe (XDS110) for programming or debugging, the Debug Subsystem will be powered on and the device will never go to shutdown. In order to power off the Debug Subsystem, you must power off the device (not reset), then power it up again and then make the low current measurements.

    Also, keep in mind that any external peripheral or leakage from other ICs might influence the very low current measurements.

    For details about power measurements with our devices, please refer to the application note below:

    Measuring CC13xx and CC26xx Current Consumption (SWRA478)

    Hope this helps,

    Rafael