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[wxsig] Wind Speed Spike

Joe S. Borovetz wa5vms at tapr.org
Sun Jul 9 22:13:23 UTC 2006


Will

I am beginning to wonder if pull up is the issue that is killing the one 
wire bus when I enabled the DS1994.

The 1994 is trying to draw operating power from the 1 wire bus (even though 
there is a 3V internal lithium battery).




>I have three pins on the 1-wire bus in order to provide sufficient drive
>strength for the "active high" state needed for some 1-wire sensors like the
>DS18S20 temperature sensor.  The active high state is defined to allow some
>sensors that temporarily need more than the paracitic power provided by the
>pull-up resistor in order perform some function.








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