I'd like to cascade two DDC118 chips but Figure 21 "Daisy-Chained DDC118s" in the datasheet only shows the serial data line connections. What does one do with the DValid and Conv signals (or any others that may be affected by daisy-chaining)? I assume the two Conv pins must be connected together so the chips remain in sync. Which DValid pin should be looked at before reading the data out? They appear to drive both ways (i.e. not open-drain) so cannot be connected together.
Unrelated question - I only have 12 photodiodes to measure and 16 inputs available across the 2 chips. How should unused analog inputs be connected?
Any app notes available for this chip (or other chips in the series) for either single or cascade use?
