Posted by dapj20 on Jul 24, 2019 in LED-Meters-Bargraph, Test-Instruments
Auto Ranging for ICL7107 had to be done with window comparators. In ICL7135 Digital Outputs are available for autoranging. Here in this circuit is a close approximation of what i may have designed once.
Auto ranging 4-1/2 Digit Digital Voltmeter
The below Details from Datasheet - These pins are used in this circuit to Autorange the DPM with some peripheral CMOS Logic.