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TLV320AIC32 Hardware Reset

Les Oxley
Prodigy 30 points
Other Parts Discussed in Thread: TLV320AIC32

The manual for the TLV320AIC32 states that after the power supplys are good, the RESET must be driven low for at least 10ns. Taken  literary, that would mean that the RESET has a falling edge, then a rising edge after good power is reached.

I have a TLV320AIC32 that behaves exactly with this requirement. Other devices have RESET asserted LOW during the power supplys rising ( from standard POR device ), then the RESET is simply de-asserted 200ms after good power. In this case, the devices do not see any falling edge on the RESET line after good power. All other devices requiring a hardware reset are happy with output from the POR device.

This standard POR does not work on this one device, but it will  work if a RESET is driven low, then high after good power.

Does anyone know the exact requirement of the hardware RESET.

Les

  • 0
    TI__Genius 9175 points

     Hi Les,

    The reset protocol can very device to device. For this device you have confirmed the datasheet that the reset must be asserted after the power supplies have risen to their full value.

    This is because this part is register controlled and requires power to correctly reset and configure the device. It is just a property of this part.

    Regards,

    Matt

  • 0 in reply to Matthew Beardsworth
    Prodigy 30 points

    Matt,

    2388.TLV320AIC32.ppt

    I understand about the need for the reset after power up. What I see in a particular device is the I2C interface not giving an ACK in response to a good I2C transaction after what I thought was a good reset.

    See attached the Power Point. There are two possible cases. The present design uses CASE 2 as the POR device we use generates a POR that is low then goes high 200ms after good power. I would have thought this was a good reset.

    However, I have one device that likes the Hardware Reset to look like CASE 1.

    My question is. Should CASE 2 be OK ?

    Les

  • 0 in reply to Les Oxley
    TI__Genius 9175 points

    Les,

    Case 1, where reset is driven low and then high after the power supplies have been tuned on, is the correct way to reset this part as specified by the datasheet.

    Case 2 is not the correct reset procedure for this part. If the part does work with the resect procedure it is coincidence and is not a reliable method for the TLV320AIC32.

    Your testing has confirmed this:

     “This standard POR does not work on this one device, but it will work if a RESET is driven low, then high after good power.”

    Regards,

    Matt