Quite apropos to my question about Maxim Semiconductor, is there anyone _other_ than Maxim that makes serial number chips?
-- Tim Wescott Control system and signal processing consulting www.wescottdesign.com
Here's one way to get there:-
Best regards, Spehro Pefhany
-- "it's the network..." "The Journey is the reward" speff@interlog.com Info for manufacturers: http://www.trexon.com Embedded software/hardware/analog Info for designers: http://www.speff.com
What is your budget? Does it have to be 1-wire?
How about microchip
They had a MAC address chip EEPROM somewhere too.
Cheers
No need for 1-wire -- just serial number. I looked on DigiKey and only got Maxim stuff. I trust Microchip.
-- Tim Wescott Control system and signal processing consulting www.wescottdesign.com
We've used 24AA02E48 from Microchip - EEPROM for settings and MAC address included.
-- Mikko
I can't believe how cheap they are... $0.24 one off... excellent find!
NXP has a lot of this kind of stuff. Also wireless:
-- Failure does not prove something is impossible, failure simply indicates you are not using the right tools... nico@nctdevpuntnl (punt=.) --------------------------------------------------------------
IIRC, the cost of buying a block of MAC addresses is > $1K, so it's a particularly good solution for relatively small quantities of devices requiring proper unique MAC addresses.
Best regards, Spehro Pefhany
-- "it's the network..." "The Journey is the reward" speff@interlog.com Info for manufacturers: http://www.trexon.com Embedded software/hardware/analog Info for designers: http://www.speff.com
You can save yourself the trouble. Many MAC address ranges belong to companies that are long gone or turned into patent trolls. Many people forget that the scope of a MAC address only goes as far as one ethernet segment. A MAC address is not a unique product number! When a manufacturer is at the end of the range, they just start at 0 and re-use all MAC addresses ad infinitum. The chance you end up with (for instance) 2 network cards with the same MAC address on one ethernet segment is almost zero.
-- Failure does not prove something is impossible, failure simply indicates you are not using the right tools... nico@nctdevpuntnl (punt=.) --------------------------------------------------------------
Yup, an old Ethernet project may get revived because of this convenience. I think the Ieee had an issue with people buying blocks and selling individual MAC UI's This pretty much circumvents it.
Cheers
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