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ADS8028: TM_BUSY won't wiggle

Part Number: ADS8028

With ADS8028 temp conversion, I seem to be issuing the correct SPI command, and can even read out temp data.  However the TM_BUSY won't go high when conversion starts.  Not sure if I have a bad device, or if there is something else to check.  

Datasheet seems to indicate this signal is logic high/low, and no mention of any pull-up or pull-down needed.