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TAS2770: TAS2770

Ahmad Ibrahim
Intellectual 1920 points
Part Number: TAS2770


Hi Team,

I have a customer who is using the TAS2770, but he does not want to use PDM.

what is better to do with the PDM pins - PDMCK and PDMD (17 and 18)? Leave it unconnected or short it to ground  or use it in some other way?

Thanks in advance,

Ahmad

  • 0
    TI__Mastermind 21245 points

    Hi Ahmad, 

    These pins can be left floating. by default, both PDM pins are digital input pins, which can be left floating when unused.

    Regards,
    Arthur

  • 0 in reply to Arthur Brown
    TI__Intellectual 1920 points

    Hi Arthur,

    I communicated your answer to the customer but he is worried that in cmos digital circuits, leaving the input pins unconnected can cause transients.

    In table 5-1 on page four, the PDMCK pin has an IO description. Moreover, both pins are associated with i2c.

    Given the points above, he wants to make sure that leaving these pins unconnected does not interfere with the operation of the amplifier. Is this still the case?

    Best regards,

    Ahmad

  • 0 in reply to Ahmad Ibrahim
    TI__Mastermind 21245 points

    Hi Ahmad,

    both will be input pins by default. and on the EVM these are left floating without issue. Why do you believe these pins are associated with I2C?

    leaving them floating or GND should be functionally equivalent, but to eliminate the risk of the PDMCLK trying to drive high when connected to GND if the device is in some unknown state, I believe it is best to leave it floating.

    Regards,

    Arthur