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panord wrote:p.s. I tried moving all switches to open (including DIFFHW), except I2S and there is no change. I still have sound, but no control from the volumite. Have you checked the that pot is functioning correctly? Does the voltage at the wiper change when you turn it?
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Yes, looks like the pot is work. Voltage changes as I turn it.
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have you tried running the I2C from the volumite to a single Opus? It is sometime easier to find issues if you can isolate things as much as possible.
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I just disconnected the I2C from the left channel Opus. The right channel now has
SDA > SDIN,
SCA > SCK,
VCC > VD,
GND > G.
Music is playing from both channels and Volumite is not attenuating either channel
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Is it playing mono or stereo.
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It seems to be playing in stereo. I'm not sure I have a good test for this other than hearing the separation of instruments in the music.
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Thanks. I've been looking for something like. Yes, I am getting stereo playback
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Ok, well my only conclusion at this point is that you might have a dead micrcontroller for some reason. Are the voltages good local regulator on the volumite?
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Are you completely certain that all of the switches but I2S are open?
You can confirm this by checking for continuity between each switches output and VDD and GND pins of the switch. There should be none on the open switches.
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Yes. I have 7.5V at Vin and 3.3V at Vout on the regulator. And I have confirmed 3.3V at pin 8 (VCC) on the controller. Actually, voltages are a couple tenths under 3.3V, but I assume that woudn't matter.
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I'll check the switches, but just to confirm - should DIFFHW be open or 0? On the 8741 data sheet, it shows DIFFHW=0 and Mode=Z as putting the dac in software mode.
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I has to be low (0) but it has an internal pull-down, so either open or low(0) should work.
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With switches in the open position, I am getting resistances of about 25k ohms to both vd and gnd on most of them. DIFFHW is currently set to 0, I am getting 0 ohms to gnd, but 1.4k to vd. For I2S, set to 1 on the board I am measuring, I get 9k-10k to both vd and gnd.
I am now officially in over my head - I'm not quite sure what these readings are telling me, other than they are not what I expected
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There are two pins on the switch - the power terminal block side of the switch. One is to GND, the other to VDD. When any particular switch is open there may be some high resistance to either GND or VDD. That is normal because of internal pulling resistors etc. But when closed to either 1 or 0 they should have zero(very close to zero) impedance to either GND or VDD. The pad on the switch closest to the controller terminal block is VDD. Edited by user Sunday, March 6, 2011 11:42:55 AM(UTC)
| Reason: Not specified
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OK - let me know if this makes sense
Switch - position, VD reading, GND reading
OSR - open, 25K, 25K
Mute - open, infinite both
FSEL - open, 25k, 25k
DIFFHW open, infinite both
IWO - open, infinite both
Mode - open, 25k, 25k
DEEMPH - open, 15k, 9k
DSD open, 25k, 25k
I2S - 1, 0, 9k
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Hmm I guess I was not really clear. I don't mean to measure to VD, but to VDD(DVDD) which you can find at the pad I indicated or at L1.
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I should have been more clear too. I was measuring from VDD (the switch pad closest to the controller) and GND at the opposite end of the switch. I typed VD, but meant VDD.
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Interesting I2S at 1 or 0 should be a dead short to VDD or GND.
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I removed the Volumite and, yes now I2S is a dead short to VDD on one board and ground on the other. Re-attached the Volumite and I2S is measuring correctly.
While I had the Volumite removed, I was examining again for solder traces. While measuring for shorts, I measured the two resistors that lift PB0 and PB2. Both were 10k, not the 3.3k listed in the bom. Would that make a difference?
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