interfacing ADC0841

charlieknox

HI Folks· - anyone got experience or ideas on interfacing an ADC0841 analog to digital converter ( http://cache.national.com/ds/DC/ADC0841.pdf ) to the Basic Stamp 2?· I am familiar to and have used the ADC0831, but·need to use the 0841 if that is possible.· Any help in that regard would be much appreciated.

Thank you!

Charlie

Jon Williams

I'm betting you're going to have to write the code yourself. That chip requires a lot of IO lines (11 if you ignore INTR\), and most Stamp users avoid consuming so much IO for a single device.

That said, based on the data sheet I would do this (connect the ADC0841 bus to P0 - P7):

Setup:
· HIGH AdcCS
· HIGH AdcWR
· HIGH AdCRd

Main:
· ' your code here
· GOTO Main

Get_ADC0841:
· LOW AdcCS··········· ' select device
· PULSOUT AdcWr, 1···· ' start conversion
· HIGH AdcCS
· PAUSE 0············· ' allow for conversion
· LOW AdcCS
· PULSOUT AdcRd, 1···· ' transfer value to outputs
· HIGH AdcCS
· adcVal = INL········ ' read value
· RETURN

Mind you this code is off the top of my head, very late at night (I should be in bed), and without the part to test with....

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Jon Williams
Applications Engineer, Parallax
Dallas, TX· USA

Post Edited (Jon Williams) : 4/12/2005 5:14:19 AM GMT

charlieknox

Thanks Jon!· You have confirmed my suspicion of what I would have to do.· I appreciate your response.

Thanks again,

Charlie