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merlin2049er		#1 Posted : Monday, June 17, 2013 6:24:59 PM(UTC)
Rank: Member Groups: Member Joined: 6/5/2013(UTC) Posts: 19 Location: Toronto		What on the bottom of the relay driver board? And do I need it? Do you need isolation between the heatsink and 5v reg? I'm paranoid, because I saw one pictured with it. Thanks, Joe Edited by user Monday, June 17, 2013 6:26:01 PM(UTC)  | Reason: Not specified
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Brian Donegan		#2 Posted : Monday, June 17, 2013 6:51:51 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 chip under the board is the I2C port expander... yes, you need it. You don't need isolation, just be sure to use thermal compound if you don't use a thermal pad.
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merlin2049er		#3 Posted : Monday, June 17, 2013 7:10:55 PM(UTC)
Rank: Member Groups: Member Joined: 6/5/2013(UTC) Posts: 19 Location: Toronto		Which part number is the port expander? Thanks, Joe
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Brian Donegan		#4 Posted : Monday, June 17, 2013 7:38:41 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)		MCP23008-E/P from Microchip.
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merlin2049er		#5 Posted : Monday, June 17, 2013 7:41:34 PM(UTC)
Rank: Member Groups: Member Joined: 6/5/2013(UTC) Posts: 19 Location: Toronto		oh right, that's why it wasn't part of the digikey or mouser order. Thanks, Joe
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Brian Donegan		#6 Posted : Monday, June 17, 2013 8:12:23 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)		I think they both carry it... Mouser DigiKey
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