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CC2630: Device is Hang in standby mode.

Wayne Jeong97575
Intellectual 685 points
Part Number: CC2630

Hello.

My customer is using CC2630 on his application which has a long standby time.

Some products have symptoms that do not wake up after long standby time.

As a result of the circuit review, the evaluation board`s circuit and the customer circuit have different decoupling capacitor values around VDDR. (Below picture is customer`s schematic around VDDR.)

If decoupling capacitor values around VDDR were different with reference schematic, can be CC2630 hang in standby mode? 

Thank you

  • 0
    TI__Mastermind 34850 points

    Wayne,

    Is the VDDS slew rate within the datasheet limits? 

    How wide and long is the VDDR trace?

    Are the decouploing capacitors connected to a large low impedance ground plane? 

    From the datasheet:

    "The Brown Out Detector is disabled between recharge periods in STANDBY. Lowering the supply voltage below the BOD threshold between two recharge periods while in STANDBY may cause the BOD to lock the device upon wake-up until a Reset/POR releases it. To avoid this, it is recommended that STANDBY mode is avoided if there is a risk that the supply voltage (VDDS) may drop below the specified operating voltage range"

    Has the customer used an oscilloscope to observe the voltage on this supply voltage circuit and its behavior?

    BR,

    Seong

  • 0 in reply to Seong Kim
    TI__Mastermind 34850 points

    Wayne,

    Any updates on this?

    BR,

    Seong

  • 0 in reply to Seong Kim
    Intellectual 685 points

    Hi Mr. Kim

    Sorry late reply and update.

    Actually, I doubt decoupling capcitor because Customer`s schematic and reference schematic are nearly identical except for VDDR decoupling capacitors.

    Symptoms do not appear well but my customer said, when the symptoms were appeared VDDR level was around 100mV and current consumption was 70uA. (There average current consumption 1~2uA in standby mode.)

    When I measured the recharge time of the VDDR decoupling capacitors of customer`s board and CC2650EM, recharge time was 1.3s at customer`s board and 288ms at CC2650EM kit.

    And also VDDR level was 0.4V lower than CC2650EM kit.

    I had found following sentence in Technical reference manual and I shared this sentence wih customer.

    I am wating for feedback from customer.

    Thank you.

  • 0 in reply to Wayne Jeong97575
    TI__Mastermind 34850 points

    Wayne,

    I will be closing this thread for now. Please start a new thread or open this one again when you've heard back from the customer.

    Thanks,

    Seong