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TAD5212: output short circuit detection

John Wehle
Prodigy 120 points

Part Number: TAD5212
Other Parts Discussed in Thread: TMUX2889,

Is there an application note describing the short circuit detection?

The situation of interest is a stereo singled-ended capacitor (270uF) coupled output connected through a TMUX2889 to a headphone TRS jack.  If a mono headphone is inserted will that trigger a output short circuit interrupt (due to ring being shorted with sleeve) with the details in OUT_CH1_LTCH at which point the MCU can reconfigure the TAD5212 for mono operation?

The OUT_CH1_LTCH register description says it's for DC fault diagnostics and I didn't seen any discussion of how the short circuit detection works so it's not clear to me if can be used to distinguish between a mono and a stereo headphone when capacitor coupling is being used.

  • +1
    TI__Mastermind 35731 points

    Hi John,

    Inserting a mono headphone will not  trigger an output short circuit interrupt via OUT_CH1_LTCH.The short circuit flags in that register monitor faults on the OUT1P and OUT1M driver pins themselves.  I think a mono plug shorting ring to sleeve presents a load condition to the driver,  rather than a hard fault the protection circuitry is designed to catch, so this register is not capable of detecting headphone channel topology.

    Regards,

    Arash