UNI/O bus and serial EEPROMs

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Jerry Messina
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UNI/O bus and serial EEPROMs

Post by Jerry Messina » Mon Dec 22, 2014 8:25 pm

I put a module and example program on the wiki for interfacing with the Microchip UNI/O bus.

UNI/O is another one-wire bus. To be honest, there's not much interesting about it since it only seems to be implemented in a handful of Microchip EEPROMs and not much else.

There is one exception, and that's the 11AA02E48 which is a small 256x8 EEPROM along with a pre-programmed 48-bit node address (EUI-48). This comes in handy if you need an Ethernet MAC address, or it can also be used in places where you might want a globally unique serial number. The device is available in a small SOT-23 package, and you only need a single wire interface to it (plus it's cheap).

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David Barker
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Re: UNI/O bus and serial EEPROMs

Post by David Barker » Tue Dec 23, 2014 8:23 am

Thanks for sharing Jerry...

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Re: UNI/O bus and serial EEPROMs

Post by Jon Chandler » Sat Dec 27, 2014 8:33 am

If it's cheap, that sets it apart from Dallas 1-wire solutions!

I'm certain the availability will be much better from Microchip.
Jon

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Jerry Messina
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Re: UNI/O bus and serial EEPROMs

Post by Jerry Messina » Sat Dec 27, 2014 3:23 pm

If it's cheap, that sets it apart from Dallas 1-wire solutions!
Yeah, the Dallas DS2401 is about $1.60US, while the Microchip part is < 0.30, and that's in singles.

I ran across it while looking for a cheap serial number chip. Unfortunately, there's not really any more devices w/ a UNIO interface, at least not that I found.

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