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ADS8588S: Intended purpose of FRSTDATA signal?

Part Number: ADS8588S

Is there an example or explanation of why the FRSTDATA signal is provided from this and other converters and/or how it is intended to be used?  It appears (though it is still not fully clear from the datasheet) that the first data read after the busy signal goes inactive will be from the first converter.  Is that ever not true?  If it is always true, then what use is FRSTDATA?  It seems like this would just get in the way of a controlling state machine.  And if it ever appeared when not expected, what would a controller do other than error/reset?  We are designing in this part and inclined to leave FRSTDATA unconnected - yet it seems wrong to support (or not) a signal just because we don't understand it  - so any insight would be helpful.  Thanks.

  • Hi AlliedCW,

    The FRSTDATA output signal indicates the conversion data of first channel in either of the interface mode. This can be used to check if the incoming data is correctly aligned. The data should be aligned during normal operation, however a transient signal or glitch shown on /RD or /CS might cause an extra read operation so that the data received by the controller may no match its actual channel. Monitoring the FRSTDATA signal allows to recover from such failure event. It's optional for you to use this feature.

    Best regards,

    Dale