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mcruz

14 Posts
Posted - 12 Mar 2003 :  09:37:59  Show Profile  Email Poster
What does it standfor? Do you have a central "glossary"? How is it used? Any documentation on this?

akidder

1519 Posts
Posted - 12 Mar 2003 :  10:08:52  Show Profile  Email Poster
PWM stands for "pulse-width modulation". It is a way of simulating an analog signal by varying the duty cycle of a digital output.

For example, to control backlight intensity, we take a square wave output running, say, at 1kHz, and vary the time that the signal is high from 0 to 100% (in this example, from 0.0 to 1.0 ms). We then run the square wave through an RC (resistor-capacitor) network to smoothe(integrate) the digital output into a relatively stable analog signal suitable for control of variable-voltage devices.

We use PWM signals in our systems to control backight intensity(brightness) and Vee (the contrast control voltage for passive displays).

We don't have a technical glossary, but http://www.whatis.com and other online resources can help you to get up to speed with industry terms. You can also run an ADS forum search for a term to see the contexts in which it is used.
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Larry Ricci

42 Posts
Posted - 12 Mar 2003 :  11:32:47  Show Profile  Email Poster
PWM is also a common way to modulate servos and motor speed controllers. I am not sure if any of our customers are useing PWM this way, but I see no reason why they could not.

Larry "Industrial Crumudgen" Ricci
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mcruz

14 Posts
Posted - 12 Mar 2003 :  12:07:25  Show Profile  Email Poster
thanks
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