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CC2640R2F: CC2640R2 power up problem

Daniel Benkman
Intellectual 525 points
Part Number: CC2640R2F

We are trying to bring up our own board using the CC2649R2 processor.  We received Processors that don't have any code in their flash.  When we apply power and reset the processor, we see very little current draw from the processor, and it appears that it may be 'asleep'.  It does not respond to JTAG signals.

The question is what is the proper behavior on reset for a CC2640R2 chip without any firmware in flash?  Does the bootcode put the chip to 'sleep', or should the processor stay active and respond to JTAG commands?

To rephrase the question, on power up, does a CC2640R2 chip without any firmware loaded in flash stay awake and responsive, or does it go to 'sleep'?  If it goes to sleep, how can we wake it up to put code in its flash?

Thanks for any help you can give.

Dan Benkman, Innowave

  • 0
    TI__Mastermind 22580 points
    Hello Daniel,

    At the very least the JTAG should work. Are you using a LaunchPad or custom board?

    Thanks,
    Sai
  • 0 in reply to Sai Reddy
    Intellectual 525 points
    We are using our own board, trying to bring it up. From what you are saying, we should look for a hardware issue rather than trying to figure out how to get around a power on peculiarity of a processor that has no program in its flash.

    A related question: If and when the CC2640R2 processor goes to sleep, should we still see running signals of the crystal oscillator pins? If there are no moving signals on the oscillator pins with power on, does that always indicate a hardware problem?

    Thanks for your help!

    Dan
  • 0 in reply to Daniel Benkman
    TI__Mastermind 22580 points

    Hello Daniel,

    Daniel Benkman said:
    We are using our own board, trying to bring it up. From what you are saying, we should look for a hardware issue rather than trying to figure out how to get around a power on peculiarity of a processor that has no program in its flash.

    Yes.

    Daniel Benkman said:
    A related question: If and when the CC2640R2 processor goes to sleep, should we still see running signals of the crystal oscillator pins? If there are no moving signals on the oscillator pins with power on, does that always indicate a hardware problem?

    Typically if the MCU/Processor is in low-power mode then the crystal (for "Run" mode) might not be excited by the MCU, to save power, so you might not see any signal. Typically a different crystal or internal oscillator (running at lower frequency) would be used in low-power mode and hence that one would be excited instead of the crystal for "Run" mode.

    I am not sure if that is the case with CC2640R2 though.

    Thanks,

    Sai