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How connect an ADC to UPP interface

Damien TROMSON
Prodigy 120 points
Other Parts Discussed in Thread: ADS8471, OMAP-L138

Hi,

How connect an adc, like the ads8471 to the upp interface ?  When the DSP is in receive mode, we need only the clock signal and the data bus. But how generate the clock signal ? The adc hasn't clock output.

I can't find a application circuitry with an adc on the upp interface. Know you where I can find an exemple ? Are all parallel ADCs UPP compatible ?

Thanks

 

  • 0
    TI__Mastermind 46290 points

    OMAP Team,

    This topic has been discussed in some detail on the Precision Data Converters forum, that thread may serve as a good starting point for servicing this request. I've proposed a pair of methods of communicating with the ADS8471 (bit banged gpio parallel bus, and uPP receiver w/gpio CONVST). I do not have experience with the OMAP-L138, so there may be a better method than what I have proposed. If there are any questions on the converter's interface I'll be happy to help...

    You can view the other thread here.

  • 0
    TI__Expert 8890 points

    To use the uPP peripheral in receive mode, you will need an external clock signal.  One easy solution could be to configure the uPP to operate in 2-channel mode and set the second (unused) channel to operate in transmit mode.  In this case, the uPP transmit clock will run continuously and can be used to drive your uPP receive channel and the ADC.

    Unfortunately, TI does not provide any reference designs that show how to use uPP and an ADC together.  The uPP protocol is relatively simple, so I would expect most parallel ADCs to be compatible with it.

    Hope this helps.