Analog Isolation
Fellow Stampers..
Could you suggest to me how to isolate analog inputs and outputs going into a stamp microprocessor. I saw an analog isolation chip ps8601 but couldn't quite figure out how it· works.. it seems to require pulse input.. not an analog input. Has anyone done this?
Thanks, John
Could you suggest to me how to isolate analog inputs and outputs going into a stamp microprocessor. I saw an analog isolation chip ps8601 but couldn't quite figure out how it· works.. it seems to require pulse input.. not an analog input. Has anyone done this?
Thanks, John
Comments
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Chris Savage
Parallax Tech Support
John
ps I think the discrete I/O points are easier to setup. But the analog opto isolation chips are not always easy to understand. eg. ps8601 (~2) and have different techniques BB iso124. Ideally we would like to run every thing off a nominal 5V supply.
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·· I don’t have any part numbers right off the top of my head except old-school parts.· I used to use the TIL111 in my old circuits.· Technology has come a long way since then and there are opto-isolators which would be better suited to a linear analog signal into an ADC.· In fact, I posted a link to a website a couple of times where a customer did this very thing to monitor the individual cells (batteries) on his electric car.
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·· Each battery was tied into an opto and its output was fed into an ADC.· The output was configured so that they could each be calibrated.· It was a very clever design and may help you out.
http://genki.home.ionet.net/BattMon/BattMonArticle.html
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Chris Savage
Parallax Tech Support