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Daisy chain multiple ADS1298 with different register setup

Laszlo Nagy Kanasz
Prodigy 30 points
Other Parts Discussed in Thread: ADS1298

Hi

In our project we want to use at least 2 ADS1298. 

And put them in daisy chain . With shared DIN,CS. DOUT connected to Daisy IN(and from the last ADS the DOUT goes to  a Tiva C), so as it is in the data sheet of the ADS1298 for daisy chaining.

But here come our problem...

We want to configure different registers, so the register settings wont be the same for all ADS1298.

At this point we are thinking about to use separate CS (or DIN if you say that its better), and leave all DOUT and DAISY connected as it was before.

My question is: Will the daisy chain still be function able if we have a different register setup(keeping the same sample rate)?

I know we have to pull up/down the all CS lines in the same time to keep the Daisy Chain concept.

The question is just is it possible to keep the daisy chaining with different register setup.

Best Regards

Laszlo

  • 0
    TI__Mastermind 38745 points
    Hey Laszlo,

    From what you've described, that configuration should work as long as the register settings do not change the output data rate or format so you can guarantee synchronization of the devices. That being said, you might run into a problem if you hope to read the registers of the daisy-chained device. Since the DOUT pin is connected to the deselected chip instead of the processor, it would be impossible to get any information from the device except conversion data. If you never need to read the registers, then that may not be a problem for you. If you do, consider using the cascaded configuration where the DOUTs of both devices are connected to the MISO pin of the processor. That configuration has trade-offs compared to the daisy-chain configuration as I'm sure you're well aware.

    Regards,
    Brian Pisani