A simple google for the datasheet revealed this:
The data lines are tri-state. They serve as both input and output at
different times depending on RD and WR.
Reading page 10, it appears you start a new conversion by *writing* a
specific command to the device (the command selects what channel, details in
table 1). When the conversion is done the 'int' line goes low (you can
connect this to an interrupt on your microprocessor or poll it I guess).
You then perform a 'read cycle' to get the results. You read the results in
two read-cycles, one with HBEN low and another with HBEN high. The chip
puts the two bytes of the output on the data bus, one during each
This sort of device is designed to interface with a simple 8-bit
microprocessor / microcomputer such as the classic PIC devices. I wouldn't
try to use it stand-alone.
It looks like it has several features, including an on-board reference for
conversion measurements or allows an external reference to be used.
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