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Old 10th March 2008, 02:07 PM   #801
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The Kook didn't have them and worked fine.
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Old 10th March 2008, 02:10 PM   #802
alexcd is offline alexcd  United States
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Does anyone see an issue with using two PGA2310's per PIC? All signals are split with no resistance between them.
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Old 10th March 2008, 02:22 PM   #803
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adding the Rs wouldn't be a bad idea, but controlling two PGAs from a single pic in and of itself is fine.
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Old 10th March 2008, 03:27 PM   #804
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Hi Alex,

I would need to see your schematic and layout to be able to help you out.

If you schematic matches the kookaburra schematic, it should work.

Cheers!
Riss
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Old 10th March 2008, 03:49 PM   #805
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Here is my schematic. I left off the audio stuff cuz it's really just some opamps that I'm using for buffers. I really hope you can help. I'm getting a very VERY distorted output (seen on scope.)
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Old 10th March 2008, 05:18 PM   #806
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Hi Alex your partial schematic seems correct (as far as it goes). You need to double check your PCB and your analog circuit.
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Old 10th March 2008, 05:23 PM   #807
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Quote:
Originally posted by alexcd
Here is my schematic. I left off the audio stuff cuz it's really just some opamps that I'm using for buffers. I really hope you can help. I'm getting a very VERY distorted output (seen on scope.)
I'm running mines one pic(outputs of the PIC are split.) + two pga's,so far everything OK. It been running a total of 24hrs.
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Old 10th March 2008, 06:17 PM   #808
alexcd is offline alexcd  United States
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Here's my PCB layout of the PIC -> PGA2310 interface (the 2nd VC chip is directly above the lower) I'm worried the runs are a bit too cluttered.
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Old 11th March 2008, 10:38 PM   #809
breez is offline breez  Finland
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Russ White,

If you don't mind asking, how did you implement the sleep/wake up with PIC? I can't think of an easy way to wake up on pot turn.

Referring to this comment early from this thread:
Quote:
The PIC now sleeps until the pot is moved at which time it wakes up, sends the serial data to the PGA2311 and goes back to sleep.
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Old 11th March 2008, 11:11 PM   #810
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Quote:
Originally posted by breez
Russ White,

If you don't mind asking, how did you implement the sleep/wake up with PIC? I can't think of an easy way to wake up on pot turn.

Referring to this comment early from this thread:

Keep in mind, I was a complete beginner with PIC programming at the beginning of the thread.

I think I was simply mistaken when I posted that, as I can tell you with certainty it is not possible without modifying the circuit significantly or using a different PIC controller. What I probably meant was that no serial communication to the PGA was happening unless the pot position changed, which is true.

You would use a comparator and a change notification pin, if you had one available for input.

There is also another newby mistake I made regarding the zsen pin in my initial design, but its pretty harmless. The astute will see it right away (As some already have). The pin that is supposed to be driving it is an input only pin. Rookie mistake.

Cheers!
Russ
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