interface between 3.3 volts and 5 volts.
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interface between 3.3 volts and 5 volts.

 
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satishg
Guest
Posted: Wed Nov 30, 2005 5:16 pm    Post subject: interface between 3.3 volts and 5 volts. Reply with quote
hi.....

i have to interface 3.3 volts and 5 volts circuit elements..
my DSP board works on 3.3 volts and optocouplers works on 5 volts.
my dsp will not tolerate more than 3.3volts.
i am giving the 3.3 volts DSP PWM output signals to 5 volts drive
optocouplers.
what interface i can use (easy to find) between the DSP and optocouplers.

byeeeee
satish
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Noway2
Guest
Posted: Wed Nov 30, 2005 5:16 pm    Post subject: Re: interface between 3.3 volts and 5 volts. Reply with quote
How about a transistor. Be sure to use one that is fast enough for
your application, though.
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Al Clark
Guest
Posted: Wed Nov 30, 2005 5:17 pm    Post subject: Re: interface between 3.3 volts and 5 volts. Reply with quote
"satishg" <satish05_eee@yahoo.co.in> wrote in
news:IZudneWRoNGgAhDenZ2dnUVZ_vydnZ2d@giganews.com:

Quote:
hi.....

i have to interface 3.3 volts and 5 volts circuit elements..
my DSP board works on 3.3 volts and optocouplers works on 5 volts.
my dsp will not tolerate more than 3.3volts.
i am giving the 3.3 volts DSP PWM output signals to 5 volts driven
optocouplers.
what interface i can use (easy to find) between the DSP and optocouplers.

byeeeee
satish



If you are driving from the DSP to optoisolators, you might not have to do
anything except possibily adjust the limiting resistor to provide a little
more current. With most optoisolators, you are just driving an internal
LED. A series R sets the current.

If you have 5V outputs that you need to feed into the 3.3V DSP, look at
74LVCxx devices. The 74LVC125 is a popular choice for this purpose.

--
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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