• State Resolved
  • Locked Locked
  • Replies 2 replies
  • Subscribers 46 subscribers
  • Views 398 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.

Connecting ADS1x7x EVM to a FPGA

Ronaldo Viera
Prodigy 100 points
Other Parts Discussed in Thread: TCA9535, ADS1274

Hello guys!

We are trying to connect our ADS1x7x EVM rev E (equiped with an ADS1274) to our FPGA. I'm a bit confused about which pins in connector J4 should be connected to our fpga dev board. We want to operate with Discrete FSYNC protocol, in HighSpeed mode. To achive that, we need FORMAT[2:0] = 101 and MODE[1:0]=00. Should I connect directly my FPGA pins to J4.8 (FORMAT[0]), J4.12(FORMAT[1]), J4.14(FORMAT[2]), J4.2(MODE[0]) and J4.6(MODE[1])? I saw in SBAU197 that those pins are connected to the ADS1274 pins and to U7 and U8 (TCA9535) pins. Drive J4.8, J4.12, J4.14, J4.2 and J4.6 directly can damage U7 and U8 ports?

We also want to feed the device clock (fclk) to ads1274, should I connect the clock source to J4.5 or to J4.17? Again, can I feed thos pins directly?

Any help will be welcome,

Thanks in advance,

Ronaldo

  • 0
    TI__Guru**** 181001 points

    Hi Ronaldo!

    We're on break for the Thanksgiving Holiday here in the US through Monday next week.  We'll get back to you on this question as soon as possible.

  • 0
    TI__Guru** 113765 points

    Hi Ronaldo,

    If you are driving the EVM directly from your controller, you can connect to the J4 connector providing you have the S1 and S2 switches in the down (toward the center of the board) position.  For the Mode and Format controls, you can manually switch the S1 and S2 switches to the desired positions and avoid the connections to the FPGA altogether.

    For your clocking situation, you need S6 to be in FSYNC mode, and connect the clock through J4.5.

    Best regards,

    Bob B