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TAS5431-Q1: What are the conditions for AMP to detect an open circuit

Rain Wang
Expert 1400 points
Part Number: TAS5431-Q1


HI  TI

Test steps:

Step 1: shut down the equipment and remove the horn connection. After the equipment is powered on, read I2C and read the fault signal; Step 2: I connect the horn correctly and read that there is still a fault signal in I2C;

Step 3: I will power off and restart the equipment again, and then power on to detect that the horn has been correctly connected;

My question:

1. Is the above phenomenon normal?

2. Why is there still a fault signal read by I2C after the second step is connected correctly?

3. What is the mechanism of chip detecting open circuit?

  • 0
    TI__Mastermind 45085 points

    Hello Rain,

    If you turn on the equipment without a speaker connected, you will get an open load fault in the load diagnostic fault register.  The device will still pass a signal.  You can then connect a load and power cycle the amplifier and all will function correctly.

    When the device is taken our of standby mode, the device runs a DC load diagnostic test.  If the load is lost during operation, you will never see that the load is lost, unless you place the device back to standby mode, wait 100us and then taken out of standby mode to read that the load is missing.  There is no real time diagnostics on this device.

    Regards,
    Gregg Scott

  • 0 in reply to Gregg Scott
    Expert 1400 points

    Hi  Gregg

          thanks for your reply, It's very helpful to me；

          You say "There is no real time diagnostics on this device.",  But the red underlined part at the bottom of the datesheet doesn't mean real time diagnostics on this device？

  • 0 in reply to Rain Wang
    TI__Mastermind 45085 points

    Rain,

    You cannot read half the sentence.  You must read the whole sentence.  

    "On detection of any other fault condition, the output goes into a Hi-Z state and the device check the load continuously until the removal of the fault condition."

    This means after a fault is detected it continuously runs load diagnostics.  It will be in the Hi-Z state at this time.

    Regards,
    Gregg Scott