Writing to the configuration register (or scratchpad 1 in general) is not
supported -- at least in the datasheet.
You are right, there are differences in the command set between the two
devices -- but I don't kmow what either one actually does to undocumented
commands since I don't have samples to test.
Paul Alfille
On Sat, Jul 14, 2012 at 11:09 AM, Jeff Siddall <[email protected]> wrote:
> On 07/14/2012 09:57 AM, Paul Alfille wrote:
> > The support for the MAX31826 is complete, except I've run into a snag:
>
> Thanks for the fast work on this!
>
> > The MAX31826 has 12-bit resolution and 128byte of memory
> > The DS1825 has 9-12 bit resolution and temperature alarm limits and no
> > memory
> >
> > Both have family code 3B and both have the adjustable address.
>
> Hmmm... yeah, I hadn't noticed that. I wonder why they didn't just
> change the family code.
>
> > The MAX31826 is much faster reading full resolution temperatures
> > (150msec vs >750msec)
>
> That will be nice!
>
> > I wonder if there is a way to tell by the chip ID range, but I have no
> > information. I have a support email into Maxim submitted.
>
> I am guessing the answer will be no :(
>
> Without having any real knowledge of the inner workings of 1-wire, what
> happens when you read bits 5 and 6 of the configuration register of the
> MAX31826? The documentation simply says "-" for those bits, but they
> must return some value when read. If they always return the _same_
> value (hopefully 1's for backward compatibility) then it may be possible
> to test for a MAX31826 by writing something else there and then reading
> it back and see of the values changed.
>
> That is kind of ugly but it it works would at least be easy to implement.
>
> Jeff
>
>
> ------------------------------------------------------------------------------
> Live Security Virtual Conference
> Exclusive live event will cover all the ways today's security and
> threat landscape has changed and how IT managers can respond. Discussions
> will include endpoint security, mobile security and the latest in malware
> threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/
> _______________________________________________
> Owfs-developers mailing list
> [email protected]
> https://lists.sourceforge.net/lists/listinfo/owfs-developers
>
------------------------------------------------------------------------------
Live Security Virtual Conference
Exclusive live event will cover all the ways today's security and
threat landscape has changed and how IT managers can respond. Discussions
will include endpoint security, mobile security and the latest in malware
threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/
_______________________________________________
Owfs-developers mailing list
[email protected]
https://lists.sourceforge.net/lists/listinfo/owfs-developers
