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.
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.
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.
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.
Comments
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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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