Using a ICL7135 A to D Convertor with a Microcontroller is easy with the Serial Interface. The advantage is you could use an Opto Coupler to protect your Embedded System.
uC Input and Output I/O is Keyboard and LCD when you build a
Calculator or a Text/Morse Communicator. When you control a
motor it is Drive/Speed and Direction for Motor and Tacho or
Opto Counters for Feedback. In both cases you have Input and
Output which is Logic or Analog which has to reach the CPU.
Getting the analog into the uC is done here with ICL7135,
with a simple two wire serial interface. Here a Pair of CD4538
MMV is used to shape the pulse just right for uC data
20th Apr 2020
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