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CCS/CC1310: Device does not always scan at power-up

Ken lucas
Intellectual 360 points
Part Number: CC1310


Tool/software: Code Composer Studio

We have a new problem that we are seeing on a few boards. This is our own custom board and is only exhibited at initial power-up.

What we see is that the processor will start but the RF scan is not initiated. We do not believe the CC1310 is hung because if we 

plug in a terminal we see the device boot every time. Obviously plugging in the terminal changes the operation, but it does not necessarily alter

the application of power. 

I just wanted to see if anyone else has seen any erroneous power up behavior? If we push the hard reset button, connected to RESET_N on the chip the RF

scan happens as expected. We are investigating the external power on the board, but just wanted to see if there was any power up sequences / instructions 

that are recommended.

Thanks,

Ken

  • 0
    TI__Genius 15590 points

    Hi Ken,

    Can you share your schematic, at least as it relates the the CC1310?

    Thanks,

    Alexis

  • 0 in reply to Ken lucas
    Intellectual 360 points

    Hi Alexis,

    Here is a little more information. We do not believe this is a radio issue but rather a issue with the CC1310 at initial power-up.

    the lockup occurs approximately 1 out of 10 times the board is powered up using an external power supply (3.3V / 2A). We do have a reset controller that delays RESET_N release for 120ms after power is applied to the board. Thus far if power is applied and then the reset button is pressed the CC1310 almost always starts properly. Could this be a case of a power-up brown out event? We did have a scope on VDDS, VDDR , power in and could not see any anomaly that should cause a brown out. The other possible thought was perhaps the 32.768 clock misbehaving. I am hoping that you might have some other suggestions to help narrow down this time 0 event, it is definitely related to the initial application of power, but we thought by delaying the reset, this should push us out of the transient conditions. Perhaps the chip is already in a fault state even before reset is released.

    Thanks,

    Ken

  • 0 in reply to Ken lucas
    Intellectual 360 points

    Alexis,

    Any update? Please know that we have had this schematic reviewed your apps team previously. What we would like to know is

    what could cause the CC1310 to not begin execution. I was most concerned about a clock problem. Thanks 

  • 0 in reply to Ken lucas
    TI__Mastermind 27145 points

    Hi,

    I don't see the Reset circuit in the above image. Could you please post PDF version of Schematic for further review?

    Thanks,

    PM

  • 0 in reply to PM
    TI__Mastermind 27145 points

    Hi,

    I reviewed your Schematic and don't see any issue with Reset and Power Supply Circuitry.

    What code are you using?

    Are you using RTOS version or not?

    Thanks,

    PM

  • 0 in reply to PM
    Intellectual 360 points

    Hi PM,

    We believe we have narrowed the issue down to the TI load switch powering the CC1310. We see the behavior when the 

    the load switch switches between pass through and boost mode. I will close this case.

    Thanks,

    Ken