From: "petrus bitbyter"
Subject: Re: How do I feed 0v/1v logic levels to CMOS?
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Date: Sat, 12 Oct 2002 13:07:31 GMT
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Organization: chello broadband
The most simple way I know, is using a "good" old LM339. The package
contains 4 comparators but you only need one of them. You can power the
package with the 12V. Connect one input to your device and the other to a
voltage divider of let's say 12k, 560 Ohm. (12k to 12V, 560 Ohm to GND, the
other ends of the resistors tied together with an input of the comparator.)
The output needs a resistor of 820 Ohm - 2k2 to 12V as it is an open
"Miles" schreef in bericht
> Can anyone please help me with (I hope) a simple problem.
> I have a temperature monitoring device with 1.5v battery supply. It
> logic levels of 0v (low) and 1.5v (high).
> I want to connect this to a CMOS circuit I'm constructing running of
> supply (on a PC). The CMOS circuit is a simple logic one using 4001 type
> transistors etc.
> I know I need some kind of voltage shifter to up the high level to at
> or so. I'm considering using single-supply op-amp as a voltage comparator.
> Can anyone suggest a simple way of doing this? Any help, references,
> would be very much appreciated.