Hi
in a new design i like to control the ADS8422 with only a few available IO-pins. Hence, i try to use not more signals than really needed. I like to use the 8-bit bus width option ==> i need also to connect the BYTE signal of the converter.
1. But how about the CS and RD signals? The only thing i can find which referes to this questions at least a little is "These multi-word read operations can be performed with a multiple active (toggling) RD signal or with the RD signal tied low for simplicity." on page 20 of the datasheet. However, for me this formulation is not clearly enough. So, the first question is: do i really need CS or RD or both or any combination of that? My hope is to connect them fixed to GND - will that work? Of course in my design the DB signals will not be connected to a bus system. So, conflicts with other devices are not possible.
2. Do i need to implement the RESET function? Will the AD-converter always safely startup just from power-up by himself? The sample circuit in Figure 34, page 23 connects this signal to an Address Decoder. For me that looks like an option, not a must.
3. For RESET/PD1 as well as PD2: if those pins (or some) are not needed, how do i connect them correctly? Can i leave them open (due to internal pull-up) or fixed to +VBD or even connect in another way?
Thanks in advance!
Ünal Dogan
