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TAS5717 trim

This question is answered
Mark DesMarais
Posted by Mark DesMarais
on Apr 05 2012 09:27 AM
Prodigy20 points

Hi-

I'm looking for a little more information on the Osc Trim register-

***********************

OSCILLATOR TRIM REGISTER (0x1B)
The TAS5717/9 PWM processor contains an internal oscillator to support autodetect of I2S clock rates. This reduces system cost because an external reference is not required. Currently, TI recommends a reference resistor value of 18.2 kΩ (1%). This should be connected between OSC_RES and DVSSO.


Writing 0x00 to register 0x1B enables the trim that was programmed at the factory.


Note that trim must always be run following reset of the device.

***********************

I think I understand the function of the oscillator- but what needs to be done to trim it? That last Note concerns me as I can't find any other references  to trim in the spec.

Thanks

markd

TAS5717
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  • Ravi Singh
    Posted by Ravi Singh
    on Apr 05 2012 13:51 PM
    Verified Answer
    Verified by Ravi Singh
    Mastermind19670 points

    Mark,

    Writing x00 to register 0x1B is all that is needed to trim the device.

    The read-back from the register 0x1B at start-up is x82 (hex). Note that after the trim command, the read-back from this register will be xC0 (and not x00).

    Regards,

    Ravi Singh

    Audio Applications Engineer.

    Best Regards,
    Ravi Singh
    Audio Applications Engineer

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  • Mark DesMarais
    Posted by Mark DesMarais
    on Apr 10 2012 09:01 AM
    Verified Answer
    Verified by Ravi Singh
    Prodigy20 points

    Thanks Ravi- we have verified as well.

    Markd

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