• State TI Thinks Resolved
  • Locked Locked
  • Replies 1 reply
  • Answers 1 answer
  • Subscribers 46 subscribers
  • Views 477 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

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.

DAC7750 SPI reading back issue question?

Joel Li
Intellectual 2165 points
Other Parts Discussed in Thread: DAC7750

Hi team,

Here is a question from a customer when using DAC7750. When we are sending read command and reading back registers, the returned value is always the same as what we send:

Channel 1: SCLK;  Channel 2: SDO;  Channel 3: Latch;  Channel 4: DIN. Please ignore the amplitude difference (channel 3 probe is 10x gain setting).

As you can see, when sending 24 bit: 0x 02 00 0B to read configuration register, the returned value is same as what we send: 0x 02 00 0B. And we have tried to read different registers, the situation is same.  

what could be the reason?

Thank you!

Joel Li

joel-li@ti.com

  • 0
    TI__Mastermind 46290 points

    Joel,

    Could you provide the intended register configuration for the device? Is there any chance daisy-chain is enabled? If I recall correctly the device shouldn't have anything but 0's on the SDO pin unless a valid read command sequence is issued. If daisy-chain is enabled the device is just clocking out data on SDO as it should for a daisy-chain configuration.

    Otherwise the edges / frames seem to be okay.