PCM2902 volume control

jmar · 7th November 2005, 07:12 PM

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.

janneman · 7th November 2005, 08:24 PM

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

Nisbeth · 7th November 2005, 08:30 PM

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

/U.

jmar · 8th November 2005, 03:20 PM

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.

7th November 2005, 07:12 PM	#1
jmar diyAudio Member Join Date: Jan 2004 Location: Indiana	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.

7th November 2005, 08:24 PM	#2
janneman diyAudio Member Join Date: May 2002 Location: Where Germany, The Netherlands and Belgium meet Blog Entries: 6	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 __________________ /Another new issue: Linear Audio Volume 3!

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7th November 2005, 08:30 PM	#3
Nisbeth diyAudio Member Join Date: Jan 2001 Location: Denmark	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 /U.

8th November 2005, 03:20 PM	#4
jmar diyAudio Member Join Date: Jan 2004 Location: Indiana	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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