Am 30.11.2016 um 11:18 schrieb Robin Gilks:
>
> I've been using DS2438 battery monitor devices for a number of years and
> they have a family code of 0x26 NOT 0xA6.
>
They can have both. See page 12 of the Book of iButton standards (sheet
19 of http://pdfserv.maximintegrated.com/en/an/AN937.pdf)
Bit 7 is a "customer coded" flag. That means an 0xA6 DS2438 is a DS2438
with a serial number from a secondary pool.
These devices seem to appear from time to time. We could easily add
support for them.
> I'm pretty sure that there are no genuine Dallas/Maxim devices with
> a family code where the MSB is set.
>
For example 0x81 is a DS2401 built into the DS9490 USB host adapter.
There are some more but yes, the most of the upper half of family codes
is unused.
Kind regards
Jan
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