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TLC3578 Mode 00

Stephen Miller
Prodigy 90 points
Other Parts Discussed in Thread: TLC3578

I am trying to code up an FPGA to communicate with the TLC3578 via Mode 00 or one-shot mode.   Here is my problem, I write out the SPI code to select an analog input channel and wait for the conversion to complete.  Now to actually get back the analog measurement, I have to do another SPI transaction.  The problem is finding a "good" dummy command to get this data back.   If I issue the same select analog inpu channel command, then I waste time doing another conversion.  It seems what is needed is a NOP instruction that just allows access to the previous command output data.  However, I do not see anything like this in the Command Set.  What an I overlooking?

Thanks.

 

  • 0
    TI__Guru**** 174156 points

    Hi Stephen,

    Assuming you are going by figures 11 or 12, you are not overlooking anything.  That is simply the way these devices were designed to work if /CS or FS initiates the conversion.  If you can use the CSTART pin to initiate the conversion as in Figure 13, the 'select channel' command will give you the conversion results without initiating a new conversion.  The command you send will setup the MUX for the channel you wish to convert the next time you actually pulse CSTART.