• State TI Thinks Resolved
  • Locked Locked
  • Replies 1 reply
  • Answers 1 answer
  • Subscribers 98 subscribers
  • Views 450 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

TMS320C6748: SPI1 Enable Pin

Brian Dougenik
Prodigy 160 points
Part Number: TMS320C6748
Other Parts Discussed in Thread: ADS8363,

Hello,

I am trying to interface the TMS320C6748 to the ADS8363 EVM using the SPI1 pins. I want to utilize the enable pin for handshaking with the ADC but can not find it on J15 or J16 headers. I also need a way to trigger the RD and CONVST bits on the ADS8363 but can not figure out how to do so. My thought process so far is to use one of the CS pins as a GPIO that will toggle the RD and CONVST bits right before I actually transmit the data. I am not looking for an in depth explanation on how to do this but a simple description on the process would be extremely helpful. Thank you. 

  • 0
    TI__Mastermind 30110 points
    Hi Brian,

    It looks like you are using the C6748 LCDK

    The SPI1_ENA only goes to the base of a BJT used to turn on the D6 LED: GPIO2-12 (SPI1_ENA / GP2[12])

    I recommend a blue wire from R212 (BJT side) to J16 pin 35 so you can attach the ADS8363 to J16 with wires.

    I'm not certain how RD and CONVST bits are driven in previous designs.
    The ADS8363 datasheet says that the two inputs can be shorted together. See 8.3.1.3 CONVST
    The GPIO must be an option, but I wonder how its output delay will play with the timings of the SPI transaction.

    Can you ask this question on the E2E for ADS8363?

    Regards,
    Mark