Hi Herbert.
If I am reading it correctly, the DS2761 is a "High-Precision Li+
Battery Monitor". The datasheet says that its voltage measurement
channel does so with a resolution of 4.88 millivolts resolution. Typical
thermocouples have a resolution of around 40 to 50 microvolts per degree C.
So obviously I am missing something from your description below. Could
you elaborate please?
Regards,
Ross McKenzie
ValuSoft
Melbourne Australia
Herbert E. Plett wrote:
>
>
> > <John.Craddock@...> wrote:
> > >
> > > Hi Philip,
> > > Yes, I read the article and have been doing some research of
> > thermocouple interfacing. ...
>
> why so much complication?
>
> hardware is dead simple using a 1-wire interface from Dallas-Maxim.
> thermocouple feeds directly into an ADC (DS2761) that directly
> digitizes with a
> resolution of 15uV, measures digitally its own temperature and
> connects to a uP
> via one pin (and ground). also has a 2-5V ADC that can be fed directly
> from a
> pot (ie, setpoint).
>
> so, all is needed is this chip
> ( http://www.maxim-ic.com/quick_view2.cfm/qv_pk/3468
> <http://www.maxim-ic.com/quick_view2.cfm/qv_pk/3468> ) plus a microP
> (I use
> Atmel Tiny), plus an opto-triac/triac pair or a solid state relay and
> a few
> passives, switches and a pot with a large knob.
>
> the process is all digital and the micro has the chance
> (responsibility) to
> implement whatever algorithm fits (from on-off to self adjusting) plus any
> bells and whistles (LCD display, serial logging, profile, etc).
> BTW, it DOES fit on a 1" x 2" board (exclusive of power and relay).
>
> I kept following this discussion in the hope somebody would come up
> with a two
> chip reasonable analog solution, but no, no such... (at least yet)
>
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