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Multi scan ADC trouble with ADS1256.

Hyun Woo Lee
Prodigy 210 points
Other Parts Discussed in Thread: ADS1256, MSP430F449

I'm trying to multi channel scan ADC with ADS1256.

I already programed single channel ADC successfully.

But multi channel scan has some problem.

The data has gone wrong data...

I scaned 8ch per 1ms.

And I get the date when the DRDY pin goes low.

Are there any other setting or instruction what I should do?

I f you have sample code about multi scan ADC used ADS1256(MSP430 or any other mcu), 

I'm very appreciate to send me it.

My E-mail is harry.lee@avnet.com

 

Best Regard. Harry

  • 0
    TI__Mastermind 43915 points

    Hi Harry, 

    We have a recommended procedure on page 21 of the datasheet explaining how to cycle the mux and read back the data using multiple channels. Note that when you cycle the mux, the throughput rate will decrease as there needs to be additional time for the digital filter to settle as the internal mux changes from channel to channel. We recommend issuing a SYNC and WAKEUP following a WREG to change the mux to clear out the digital filter.  If you are still having problems, could you take a screen shot of your data control lines so I can see what you are writing? 

    As for sample code. We do have some sample code for the ADS1256 for use with the MSP430 based an old MSP430F449 motherboard. You can get the files for using the ADS1256 with the HPA449 at the ftp site using the link below: 

    ftp://ftp.ti.com/pub/data_acquisition/ADS1256_on_HPA449/

    Regards,

    Tony Calabria