Re: Odp: Leading guestions+1

["Bruce Plecan" <nacelp@bright.net>]

Hope your not thinking of a GM sensor being good enough for doing that
Grumpy



> Why would you need a lambda interface to amplify the Oxygen signal?  My
research
> found O2 output straight into a 10 bit A/D has enouph resolution to
determine
> not only stoichiometric or not, but a full range of A/F ratios.  Please
correct
> me if I'm wrong since I'm now designing my own computer
> Mark






> Marek wrote:
>
> > All informations about lambda interface you can find on National
> > Semiconductors site .They have special chip for lambda sensors LM9040.
> > Marek
> >
> > > The interface chip is supposed to have a gain of 4.5.  This amplified
> > > output goes to the "5 volt" ADC chip.  Assuming the ADC uses 0 & 5.0
> > > volts as its reference range, the O2 sensor can usefully range from 0
to
> > > 1.11 volts.  If the ADC references to 5.12 volts, the O2 can go as
high
> > > as 1.14 volts.  (The spec defines full scale to be an input of 1 volt,
> > > with the output to the ADC at 4.5 volts.)
> > >
> > > The interface chip is tested to handle input voltages from -1 to +1
> > > volts.  It is designed to handle -3 to +1 volts.  And it lets the
smoke
> > > out beyond -3 and +16 volts.
> >
>
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