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CC8531 : My Microphone project (audio but high precision need), choice of component and functionnality

florian lebrun
Prodigy 50 points
Other Parts Discussed in Thread: CC8531, PGA2500, PCM4220, CC2560

Hi all,

I have a project that use one (or more if possible) instrumentation microphone.

I need a high dynamic ( 25dB to 125dB) without any traitement and high precision . The goal is to receive the signal on a software computer.

I need two solution: the first on USB, the second must be wireless.

The CC8531 seems to be the best solution on the market to do this, in addition to an ADC (PCM4220 for the nice SNR of the ADC and the good resolution 24 bits ) and definitely with a pre-amplifier ( i think to PGA2500 ) .

Microphone will be powered by Phantom or IECE supply.

Questions:

1. Can the CC8531 works just in USB streaming mode ? Like TUSB3200 ...

2. And if I unplug the USB cable, does wireless take the operation automaticaly?

I see also that a "special channel"  dedicated to exchange data between CC8531 and computer is present. I need it.

3. But on which peripheral of CC8531 the data are shifted out ( SPI , I²C ? ) .Because I would like to command the gain of my pre amplifier PGA2500 via this link.

Thanks a lot for your help. I hope to have been understandable.

  • 0
    Prodigy 50 points

    Any Professionnal from texas ? I call Texas France and they redirected my to this forum to have some answers .

  • 0
    TI__Mastermind 21125 points

    Hi Florian, 


    Sorry for the delay. 

    1. No I'm afraid this is not possible. The device can either run USB (CC85x1) or I2S (CC85x0) and not a combination. 
    2. No such thing.
    3. The data channel is only available in host controlled mode (MCU on both sides of the link) and host-controlled operation on USB devices is not allowed.  

    For your application you will need to sort the USB externally and treat the CC85xx device as a I2S input/output device only. If this external solutions has embedded MCU/application processor then this can be used to enable the data side channel. 

    Regards, 
    Kjetil 

  • 0 in reply to Kjetil
    Prodigy 50 points

    No problems. Thanks Kjetil.

    After specking with my customers, we find that the module based on CC2560 ( PAN 135) should be more adapted to our needed.

    QUESTIONS:

    1) Do you think possible to connect on I2S port, an ADC or a CODEC 32 bit, 192Khz of sampling rate to do high quality audio streaming to this bluetooth module ?

    2) We can also imagine a wifi solution. Does it exist a texas Socs where I can connect directly an I2S texas chip to send my 32 bits 192KHz Stereo data with wireless ?

    3) We need also to have a bidirectionnal communication to adjust the gain of pre-amplifier. In this case, a host could be connected to the bridge but just to receive data channel and command the PGA2500 pre amplifier for example.

    We would like to use a solution without host if possible to reduce the time and cost developpement and time to market criteria but if required...you also know develop it.

  • 0 in reply to florian lebrun
    TI__Mastermind 21125 points

    Hi Florian, 

    THis forum section is for the PurePath Wireless devices. 
    For questions on the CC2560, please ask over at the Bluetooth Applications forum:
    http://e2e.ti.com/support/low_power_rf/f/660.aspx

    Regards,
    Kjetil