Variable resistance

Eric R

Is it possible to output variable resistance on a BS2? My plans were to use a few pins with each having a specific resistance but I am looking at all my options.

Larry

Hmm- interesting concept, "outputting" resistance. Maybe you should explain your application a bit. there may be other ways to deal with your situation, such as using PWM to control voltage instead. Ends up being the same thing with E=IR

If controlling resistance is really what you need to do, Dallas semiconductor makes the DS1804. The chip is a potentiometer thay you can control with microcontoller signals. It will require 2 pins to run one, plus an additional pin for each chip if you run more than one.

Larry

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Bruce Bates

Eric R-

Sure can output a variable resistance. Take a look at using a digital potentiometer. They come in various resistance ranges, some have volatile settings and other save them. There are a number of different methods of adressing them including SPI, such that you can use Shiftin/Shiftout or bit-bang them if necessary. Maxim/Dallas [noparse][[/noparse]wwww.maxim-ic.com] and Xicor [noparse][[/noparse]www.xicor.com] are two good places to start looking.

Regards,

Bruce Bates

Eric R

Thanks guys! Guess I got ahead of the game. Got 3/4 of the way into the WAM book and found this info further back yet! Looks like the AD5220 should work fine.