ADS1248 - DOUT/DRDY functionality after SDATAC

Robert Szumowicz

Other Parts Discussed in Thread: ADS1248

Hello,

I am using the ADS1248 in the DOUT/DRDY combined mode (DRDY bit set) to limit number of the interface pins. I also perform a single conversion after a SYNC command,so I do not need the continuous reading mode where reading needs to align to DRDY. I noticed that DOUT/DRDY indicates end of conversion only when ADC reads data continuously (default state or after RDATAC command). DOUT/DRDY does not function after SDATAC (stop reading data continuously) command.

Q: Is that behaviour correct, i.e. DOUT combined with DRDY works only in the continuous reading mode?

Best regards,

Robert

over 9 years ago

0 Joseph Wu over 9 years ago

TI__Guru* 97455 points

Robert,

That behavior is correct.

Normally, the combined DOUT/DRDY function combines the DOUT with the data ready indicator so that you see both signals appear on that pin.

By issuing an SDATAC command, you prevent the normal update of that pin. This includes the conversion data and /DRDY indications. In stop reading data continuous mode, DOUT responds to a commands to read the register or data.

Joseph Wu

0 Robert Szumowicz over 9 years ago in reply to Joseph Wu

Prodigy 215 points

Thank you Joseph for a clarification.

Best Regards,
Robert

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ADS1248 - DOUT/DRDY functionality after SDATAC