It looks like they output 14 bit data directly, but the specified minimum resolution is 12 bits. I imagine the 14 bit count may vary a bit, or perhaps just be slightly incorrect. I didn’t see details in the data sheet.
I got 0.244 mbar from the 0-1 bar range, spread over 12 bits (2^12 counts). Since I forgot the 80% full range output (0 bar = 10% output, 1 bar = 90% output), it should really be: 1 bar/(2^12 * 0.8) = 0.31 mbar, for the minimum resolution. For 14 bits, that would be 0.076 mbar (1/4th the minimum), but I don’t know how reliable that reading would be. If it is simply inaccuracy and not signal noise, a proper calibration per sensor should be able to get an accurate 14 bit reading.
- nickersonm