SPI Interface to DAC7568

Dhareppa Zinjaravad

Other Parts Discussed in Thread: DAC7568

Hi,

We are working to interface DAC7568 IC with Tiva development kit and couldn't able to communicate. anybody did the SPI I/f with DAC IC?

Please help us.

Thanks

0 Luis Afonso over 11 years ago

Guru 20670 points

Hi Dhareppa,

Maybe you could provide your code file (not paste it) and a logic analizer showing the transfer of data?

0 Dhareppa Zinjaravad over 11 years ago in reply to Luis Afonso

Hi Luis Afonso,

Please find the attached DAC transmission file.

Thanks

0 Luis Afonso over 11 years ago in reply to Dhareppa Zinjaravad

Guru 20670 points

Okay, well that is only the part of the send data of course. There's not any comments so i have to ask a few questions:

I'm guessing you are using Synchronous mode so you have the LDAC connected to GND?

Do you have your SYNC pin low when you send that data?

I'm guessing pin4 is the SYNC? If so why are you setting it low after the SSI data sent?

0 Dhareppa Zinjaravad over 11 years ago in reply to Luis Afonso

Hi Luis,

Yes. We have connected LDAC pin to GND.

Pin 4 is configured as SYNC. Sorry, there is error in last line, we are making that pin low to high.

Thanks

0 Luis Afonso over 11 years ago in reply to Dhareppa Zinjaravad

Guru 20670 points

Hi, Dhareppa,

Was that a copy paste error? you sure it wasn't that making the communication not working? I also don't see where you pull SYNC LOW in the begining

Did you remember to enable the internal reference?

It would be much easier to get a logic analizer to check the MCU output to see if the timings and data are correct

0 Dhareppa Zinjaravad over 11 years ago in reply to Luis Afonso

Hi Luis,

yes. we have enabled the internal reference. However, we will monitor the timings in analyser.

Thanks

Arm-based microcontrollers forum