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Audio Amplifiers Forum
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.
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).
Audio Applications Engineer.
Best Regards,Ravi SinghAudio Applications Engineer
Thanks Ravi- we have verified as well.
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