JAJSEG5A January 2018 – October 2018 ADS112U04
The ADS112U04 offers an optional data counter word to help the host determine if the conversion data are new. The DCNT bit in the configuration register enables the conversion data counter. The data counter appears as an 8-bit word that precedes the conversion data each time a conversion result is read. The reset value of the counter is 00h. The word increments each time the ADC completes a conversion. The counter rolls over to 00h after reaching FFh.
When the host reads a conversion result, the host can determine if the data being read are new by comparing the counter value with the counter value obtained with the last data read. If the counter values are the same, then this result indicates that no new conversion data are available from the ADC. The counter can also help the host determine if a conversion result was missed.
Reset the conversion data counter by clearing the DCNT bit to 0 and then setting DCNT back to 1. A device reset also resets the conversion data counter.