hi Alex,
Doing a simultaneous temp conversion on several (3+) parasite powered chips
may consume more power than the master is capable to provide on the DQ line.
I guess that your connected DS28EA00 is not powered by vcc and reset itself
when DQ become too weak to supply enough power...
The immediate fix is of course to supply 5v to vcc at least for this
critical chip... but you may also check if your master support advanced
pullup features which allows more juice to be supplied during conversions.
For example, a ds2490 in default mode is supplying 6mA on DQ, but up to 30mA
with active pullup mode and up to 50mA with strong pullup mode which will
support simultaneous conversions on dozen parasite powered chips ...
Pascal
2010/6/21 Alex Shepherd <list...@ajsystems.co.nz>
> Hi Guys,
>
> Several of my DS28EA00 sensors have a Solid State Relay connected to one of
> the PIO outputs, which drives a water circulating pump in my underfloor
> heating system. I've just been experimenting with controlling the PIO
> outputs to control the pumps but I notice that when temploggerd does a
> scan,
> the PIO output driving the pump resets and turns the pump off.
>
> I've isolated this PIO reset to the writing of a 1 to
> simultaneous/temperature.
>
> By commenting out the simultaneous/temperature line in the temploggerd
> config it stops resetting the PIOs but now the scan takes much longer.
>
> Any ideas what might be causing this and how I might fix it?
>
> Regards
>
> Alex Shepherd
>
>
>
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