external a to d converer

Started by jean michel urbani March 7, 2004
hello List,

I have lingered on the net for the last 2 monthes to
try to get info on how to use an external ad converter
with a pic 16F628 and can't nanaged get it.

could someone help me ?

thanks

jean mi Dialoguez en direct avec vos amis gre Yahoo! Messenger !Thargez Yahoo! Messenger sur http://fr.messenger.yahoo.com




> I have lingered on the net for the last 2 monthes to
> try to get info on how to use an external ad converter
> with a pic 16F628 and can't nanaged get it.

You'd have to buy an nw chip, so why not buy a PIC with A/D? Check for
instance the 16F88.

If you realy want an external A/D you need to interface it, so what
would you use? parallel, SPI, I2C?

Wouter van Ooijen

-- -------
Van Ooijen Technische Informatica: www.voti.nl
consultancy, development, PICmicro products


Is this the fuel cell output? Many things have to be taken into
account when choosing an A to D. If you know it has to be external,
then it must be special. Maxim makes some very good AtoDs with 3 wire
interfaces.

Chad
--- jean michel urbani <> wrote:
> hello List,
>
> I have lingered on the net for the last 2 monthes to
> try to get info on how to use an external ad converter
> with a pic 16F628 and can't nanaged get it.
>
> could someone help me ?
>
> thanks
>
> jean mi > Dialoguez en direct avec vos amis gre Yahoo! Messenger
> !Thargez Yahoo! Messenger sur http://fr.messenger.yahoo.com
>


=====
My software has no bugs. Only undocumented features.

__________________________________



Any ADC in particular?

You have two choices for the interface: parallel or serial.

Maxim has a lot of great ADCs with serial interfaces. A few I/O
lines is all you need to communicate with them.

If you're looking for a turnkey example you may not find it, but
these are straightforward devices to work with. And if you're using
a serial ADC writing the interface code is a good learing experience.

Here are some examples I found (only took me a few seconds):
http://www.iguanalabs.com/adc2051.htm
http://www.maxim-ic.com/appnotes.cfm/appnote_number/2394/ln/en
http://www.electronic-
engineering.ch/microchip/projects/adc_test/nsc12130.html
http://www.technology.niagarac.on.ca/people/mcsele/TemperatureAlarm.ht
m
http://www.parallaxinc.com/downloads/Documentation/Application%
20Kits/LTC1298%2012-bit%20AtoD%20Converter/LTC1298%2012-bit%20AtoD%
20Converter.pdf

Mike
--- In , jean michel urbani <jmurba@y...>
wrote:
> hello List,
>
> I have lingered on the net for the last 2 monthes to
> try to get info on how to use an external ad converter
> with a pic 16F628 and can't nanaged get it.
>
> could someone help me ?
>
> thanks
>
> jean mi > Dialoguez en direct avec vos amis gre Yahoo! Messenger !
Thargez Yahoo! Messenger sur http://fr.messenger.yahoo.com