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Discussion Groups | Analog Devices DSPs | Switching to 2199x

Technical discussions related to Analog Devices DSPs (including Blackfin, TigerSHARC, SHARC and ADSP-21xx DSPs).

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Switching to 2199x - David Headley - Sep 25 15:25:00 2003

I started a motor control application with an ADMCF340 and it got zapped by lightning of all things. I'm considering replacing it with a 2199x series since it is faster and has a built in shaft encoder interface. However, the circuitry I've been using is all based on 5V logic rather than the 3.3V that the 2199x will use. Is there an easy way around this? My shaft encoder is really the only external sensor I have at the moment that would be an input, and my motor drive circuitry can easily be driven with a 3.3V signal. Is there some type of opto-coupler or something I could use to step down the shaft encoder signals to a level the DSP can handle? Also, is there any way to control 2 motors at different frequencies using the 3-phase PWM generator? Or will I need 2 DSPs for this? Thanks, Dave David Headley Fluid Systems, Inc. http://www.fluidsystems.us <http://www.fluidsystems.us/

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Re: Switching to 2199x - Al Clark - Sep 25 19:02:00 2003

At 10:25 AM 9/25/2003, David Headley wrote: >I started a motor control application with an ADMCF340 and it got zapped >by lightning of all things. I'm considering replacing it with a 2199x >series since it is faster and has a built in shaft encoder interface. >However, the circuitry I've been using is all based on 5V logic rather >than the 3.3V that the 2199x will use. Is there an easy way around >this? My shaft encoder is really the only external sensor I have at the >moment that would be an input, and my motor drive circuitry can easily >be driven with a 3.3V signal. Is there some type of opto-coupler or >something I could use to step down the shaft encoder signals to a level >the DSP can handle? Sure, There are many 74 Logic Families that are 5V tolerant. These include 74VHCxx and 74AHCxx. There are also small single packages in SOT23-5 packages. In all cases you supply the logic part with 3.3V. > >Also, is there any way to control 2 motors at different frequencies >using the 3-phase PWM generator? Or will I need 2 DSPs for this? > >Thanks, >Dave >David Headley >Fluid Systems, Inc. >http://www.fluidsystems.us <http://www.fluidsystems.us/ >_____________________________________ >/groups.php3 Al Clark Danville Signal Processing, Inc. -------------------------------------------------------------------- Purveyors of Fine DSP Hardware and other Cool Stuff Available at http://www.danvillesignal.com

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Re: Switching to 2199x - Steve Holle - Sep 25 19:07:00 2003

Check your specs. It's entirely possible that the encoder inputs are 5V tolerant. You might not need any translators. At 09:25 AM 9/25/2003, David Headley wrote: >I started a motor control application with an ADMCF340 and it got zapped >by lightning of all things. I'm considering replacing it with a 2199x >series since it is faster and has a built in shaft encoder interface. >However, the circuitry I've been using is all based on 5V logic rather >than the 3.3V that the 2199x will use. Is there an easy way around >this? My shaft encoder is really the only external sensor I have at the >moment that would be an input, and my motor drive circuitry can easily >be driven with a 3.3V signal. Is there some type of opto-coupler or >something I could use to step down the shaft encoder signals to a level >the DSP can handle? > >Also, is there any way to control 2 motors at different frequencies >using the 3-phase PWM generator? Or will I need 2 DSPs for this? > >Thanks, >Dave >David Headley >Fluid Systems, Inc. >http://www.fluidsystems.us <http://www.fluidsystems.us/ >_____________________________________ >/groups.php3

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