1wire Devices

[Docara]

Hi,

Generally, when you buy a 1wire device does the 64 bit ID code come with, be itit on a piece of paper or whatever?

ta

Matt

[Benj]

Hi Matt,

Yes I think the ID comes pre-programmed to ensure it is unique.

[Docara]

Hi Ben,

Yes but does the ID COME WITH IT within any supplied literature?

I will need to find addresses for approx. 14 devices (not all temp sensors).

The reason I'm asking for is that their are a couple of chips out there which have an onboard search algorithm for 1 wire devices - for simplicity do I need to incorporate one of these into a design. or can I physically type in an address against a location in a GUI?

Thanks

[EtsDriver]

Yes but does the ID COME WITH IT within any supplied literature?

It would be total madness that every chip coming to production line in a roll would have thousands of tiny confetti papers with them. You have to use some kind of onewire discovery algorithim to find the ID of the chip.

In one card i've seen there was a buffer used to "cut" all other sensors out from the network and then the board was automagically finding which one of the sensors is referencing which connector... (and those isolated-buffers were so easily blown, that card had very short lifespan).
We had a student make a "1-wire discovery" device with LCD and a ZIF socket, LCD was showing the one connected sensors's ID number to help troubleshooting.

Maxim has documented this search pretty well:
https://www.maximintegrated.com/en/app-notes/index.mvp/id/187

[Docara]

Thanks matey - I was afraid that was going to be the reponse

I was half hoping it was printed on during packaging but Hey Ho!!!

Matt