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TAS6684-Q1: No output at -40 ℃ environment

Eric Mo
Intellectual 970 points
Part Number: TAS6684-Q1

Tool/software:

Hi team

The customer tested TAS6684-Q1 in an environment of -40 ℃ and needed to preheat for more than ten minutes before it could output normally. Can you help me analyze the reason? The schematic diagram is shown below, thank you!

  • 0
    TI__Mastermind 49430 points

    Hi Eric

    This device been tested with -40C condition, and everything should be normal.

    Please check the register 0x72/0x73 to confirm the channel's working state first.

    If channel is Fault state, need to check register from 0x80 to 0x8f, find out what fault been reported.

  • 0 in reply to Shadow He
    Intellectual 970 points

    Hi Shadow,

    Thank you for your feedback.

    The values read from registers 0x72/0x73 are all 0X33, and the status report shows that all four channels are in a HI-Z state. The Fault state is that the DVDD power on reset event stored and Clock Error event stored(0x86—0x80, 0x8A—0x01). What is the reason for this? Thank.

  • 0 in reply to Eric Mo
    TI__Mastermind 49430 points

    Hi Eric

    It's quite likely the clock is not stable during this situation, and devic is waiting for clock. Let's use oscilloscope to check clock waveform under this condition.