Micronas UAC355xB series IC

Hi !

Does anyone have exprience with this chip ? I managed to obtain a few 
engineering samples, and I'm supposed to design an audio peripheral device 
for PC USB bus. The problem is that the documentation of the chip says that 
with standard firmware and drivers, it is possible to use the I2C bus to 
output data (in this case, controlling data), but there are no examples 
anywhere..

So, how on earth can I write or read anything through the I2C bus on the 
UAC3556B ? Also, does anyone have any idea about the Windows drivers for 
this chip ? If there are no special drivers, it identifies itself as an 
Audio class device, but my design would require it to also support a 
DirectShow filter for audio data input/output. Any suggestions on what to do 
? I'm prepared to write a minidriver if required, but even in that case I'd 
need some help on how to get started...

Greets,
Antti Keskinen 

The issue is still open. Just pumping it up a bit :)

-Antti Keskinen

"Antti Keskinen" <antti.keskinen@REMOVE.koti.luukku.com> wrote in message 
news:crmmfv$2sbq$1@news.cc.tut.fi...
> Hi !
>
> Does anyone have exprience with this chip ? I managed to obtain a few 
> engineering samples, and I'm supposed to design an audio peripheral device 
> for PC USB bus. The problem is that the documentation of the chip says 
> that with standard firmware and drivers, it is possible to use the I2C bus 
> to output data (in this case, controlling data), but there are no examples 
> anywhere..
>
> So, how on earth can I write or read anything through the I2C bus on the 
> UAC3556B ? Also, does anyone have any idea about the Windows drivers for 
> this chip ? If there are no special drivers, it identifies itself as an 
> Audio class device, but my design would require it to also support a 
> DirectShow filter for audio data input/output. Any suggestions on what to 
> do ? I'm prepared to write a minidriver if required, but even in that case 
> I'd need some help on how to get started...
>
> Greets,
> Antti Keskinen
>