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ADAU1781 attenuates signal

Question asked by icullumber on Jan 16, 2015
Latest reply on Apr 1, 2015 by icullumber

I have an ADAU1781 on a board that I have designed.  I am communicating with it over I2C from a PIC32.  I seem to be able to set up the chip; however, after it is set up it greatly attenuates all signals coming in. 

Without the SigmaDSP programmed, or with the core off for that matter, should the chip pass the signal through transparently? 

If needed I can post the commands that I send over, but basically I set registers 0x4000 ( just turning on the clock ), 0x4002 ( this is set to 0x00 in all six bytes, I'm not using the PLL ), the digital subsystem is turned on via registers 0x4080 and 0x4081, and I set the left and right channels on 0x400E and 0x400F.  Is there something else I should be doing to just get this to pass audio?  Thanks.

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