Power for Buffalo III and exaDevices U2I Options  Watch this topic  Print this topic  Atom Feed  RSS Feed View » Normal Threaded

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we417		#1 Posted : Thursday, October 11, 2012 7:32:17 PM(UTC)
Rank: Member Groups: Member Joined: 2/6/2012(UTC) Posts: 7 Location: Norway		Hi! My plan was to use one Placid HD for the buffala and one for the exaDevices. Is it a better solution to use one Placid HD for the two togheter, and us a trident shunt for the exaDevice? Br Arne Strom
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Brian Donegan		#2 Posted : Thursday, October 11, 2012 7:39:26 PM(UTC)
Rank: Administration Groups: Administration, Customer Joined: 10/24/2006(UTC) Posts: 2,868 Location: Massachusetts, USA Thanks: 2 times Was thanked: 141 time(s) in 134 post(s)		How much current does the Exa draw?
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we417		#3 Posted : Thursday, October 11, 2012 8:09:03 PM(UTC)
Rank: Member Groups: Member Joined: 2/6/2012(UTC) Posts: 7 Location: Norway		Ca 20 mA Arne Strom
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Brian Donegan		#4 Posted : Thursday, October 11, 2012 8:32:13 PM(UTC)
Rank: Administration Groups: Administration, Customer Joined: 10/24/2006(UTC) Posts: 2,868 Location: Massachusetts, USA Thanks: 2 times Was thanked: 141 time(s) in 134 post(s)		Using a Trident would actually work pretty well, then.
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we417		#5 Posted : Thursday, October 11, 2012 9:52:48 PM(UTC)
Rank: Member Groups: Member Joined: 2/6/2012(UTC) Posts: 7 Location: Norway		Hi! Is this a better solution than connecting the exaDevice to the I2C conector on the buffalo III board? Br Arne Strom Edited by user Thursday, October 11, 2012 9:57:28 PM(UTC)  | Reason: Not specified
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Brian Donegan		#6 Posted : Thursday, October 11, 2012 11:51:33 PM(UTC)
Rank: Administration Groups: Administration, Customer Joined: 10/24/2006(UTC) Posts: 2,868 Location: Massachusetts, USA Thanks: 2 times Was thanked: 141 time(s) in 134 post(s)		That would work as well, but the regulation will be provided by the LD1117 regulator, which won;t be as quiet as a Trident (if that matters to you).
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we417		#7 Posted : Friday, October 12, 2012 12:25:38 AM(UTC)
Rank: Member Groups: Member Joined: 2/6/2012(UTC) Posts: 7 Location: Norway		Hi! Do the LD1117 regulate other parts on the Buffalo III board? Br Arne Strom
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Brian Donegan		#8 Posted : Friday, October 12, 2012 1:12:41 AM(UTC)
Rank: Administration Groups: Administration, Customer Joined: 10/24/2006(UTC) Posts: 2,868 Location: Massachusetts, USA Thanks: 2 times Was thanked: 141 time(s) in 134 post(s)		Yes, the firmware chip.
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we417		#9 Posted : Friday, October 12, 2012 1:30:54 AM(UTC)
Rank: Member Groups: Member Joined: 2/6/2012(UTC) Posts: 7 Location: Norway		Hi! Good idea to put an extra 50 uF capasitor on the exaDevice then? Br Arne Strom
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sureshm		#10 Posted : Friday, October 12, 2012 6:38:30 AM(UTC)
Rank: Member Groups: Member Joined: 9/2/2008(UTC) Posts: 53 Location: Sydney, Australia		Power to the exa must be connected to the DACs digital power supply positive terminal (as per exa guide). Not sure about buffalo III but I have the buffalo II, and I have it hooked up to the I2C header power which seems to be internally connected to the DVCC trident output.
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Brian Donegan		#11 Posted : Friday, October 12, 2012 12:23:02 PM(UTC)
Rank: Administration Groups: Administration, Customer Joined: 10/24/2006(UTC) Posts: 2,868 Location: Massachusetts, USA Thanks: 2 times Was thanked: 141 time(s) in 134 post(s)		The important element is that the ground is shared. Either approach (I2C header or Trident fed from main supply) will work fine. On the B-III, the DVCC Trident does not power the I2C header, as it does on the B-II.
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