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PCM2902 volume control
PCM2902 volume control
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Old 7th November 2005, 07:12 PM   #1
jmar is offline jmar  United States
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Default PCM2902 volume control

I see there are pins on this chip to control volume up and down.

I want to build a simple ired remote control with some Holtek chips and was wondering if anyone knows how these pins behave.....(don't have anything breadboarded or I'd answer my own question).

If you give the pin(s) a steady high does the volume gradually get louder/softer?....or do you have to give a pulse to increment the volume?

Thanks kindly.
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Old 7th November 2005, 08:24 PM   #2
jan.didden is offline jan.didden  Europe
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I agree that the data sheet is not unequivocally clear on this, but it does mention that these inputs are "active high" which normally indicates they are activated on a logic high input.

So, it seems that the volume goes up (or down) as long as the specified input is logic high. The proof probably lies in the eating of the pudding.

Jan Didden
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Old 7th November 2005, 08:30 PM   #3
Nisbeth is offline Nisbeth  Denmark
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PCM2902 volume control
I'm pretty sure they must be pulsed. I believe it's in the datasheet somewhere, but I don't have time to look right now

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Old 8th November 2005, 03:20 PM   #4
jmar is offline jmar  United States
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I'd sure be grateful if anyone knew for sure....I'm doing a PCB and don't have a chip handy right now.

I may have to add a pulse to the ouput of my RC decoder.

Unless it reacts to a steady high...in that case, I'm fine.
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