Rank: Member
Groups: Member
Joined: 10/9/2012(UTC) Posts: 25  Thanks: 1 times
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Hi,
I'd like to isolate both I2S and I2C lines of my Buffalo III.
I planned to use:
- I2C: ADuM2250
- I2S: Si8660
The only question, where should I get the Buffolo-side power for them?
- I2C: I planned to use the I2C header 3.3V, as the original MCU is removed and the ADuM2250 requires only max. 5mA supply current, according to specs. Is this ok?
- I2S: I'm using 6 audio channels, so 5 lines to driver in total, according to datasheet, Si8660 would require around 30-40mA in total. Can I supply this current from VDCC, or that would go above limits of the Trident regulator? If no, can/should I install another trident for this purpose?
At on end of the I2S connector, there are two pins labeled "VD" - is this the 5V input?
Thanks,
igy
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Rank: Member
Groups: Member
Joined: 11/23/2014(UTC) Posts: 31  Location: Wolfsburg
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Hi,
I isolate i2c and i2s as well, i use diyhnk board (integrated i2c and i2s on one board) and supply it with 3,3V from buffalo i2c connector. Works fine for me
Tomasz
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Rank: Member
Groups: Member
Joined: 10/9/2012(UTC) Posts: 25 Thanks: 1 times
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Hi Tomasz,
thanks for your answer! I'm still wondering though, if the on-board regulator powering the the i2c lines (and I guess the original atmel microcontroller) is powerful enough to drive my total 35-45mA isolation. (probably it's lower in practice, but it's better to be prepared :)). I checked and that atmel chip barely eats half a mA, so I'm not feeling this step up safe :)
It'd be great to have some information about that on-board regulator and how much current can it supply.
I'd be also interested if sound-wise it would be better to use this i2c 3.3V supply, or the VD connector, or possibly another regulator?
igy
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Rank: Administration
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Joined: 10/24/2006(UTC)
Posts: 2,868
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The vreg on the Buffalo is a LD1117S33TR. It is rated for 950mA, so should have no issue whatsoever with your setup.
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Rank: Member
Groups: Member
Joined: 10/9/2012(UTC) Posts: 25 Thanks: 1 times
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Good news, thanks for the info Brian!
I'm going to use the i2c 3v3 line then.
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