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CC2538: CC2538 Power On Current consumption increased slowly issue

Benjamin Zhou
Expert 4000 points
Part Number: CC2538

Hi Team,

  

Customer reported an issue that while powered on the CC2538, the current consumption will be increased slowly and then dropped fast to a very low stable current consumption. And this situation also existed while erased full FLASH image at powered on.

Also tried below steps:

1)  Connect the RESET_N pin to GND, powered on CC2538, the issue still exist;

2)  Using test code, after powered on, using Watchdog to trigger software reset, the issue didn’t exist after software reset;

3)  Remove CC2538 from PCB board, test the current consumption of the board, no such issue;

4)  Re-work the CC2538 into the board, the issue still exist at power on stage.

Support Need:

This issue seems only exist at the power on stage, could you kindly help to give comments for the power on current consumption issue?

CC2538 Power Consumption Issue after power on.docx

  • 0
    TI__Guru**** 317180 points
    I can observe the same with a CC2538 EM I connect to power and tie the reset low. If I tie the reset high I don't see this (note that I used a CC2538 EM I have used before and I don't know which firmware that is running on the DUT).

    I haven't been able to track down someone that could explain what the chip does in active reset after power on. But is the behavior a problem? In my measurements the delta between the top of the slope before the current goes down and the minium after this is just ~200 uA.