The DS2436 is a rather nifty chip in that it can measure its own VDD, which gives it the ability to act as a general purpose A/D device. However, the input is limited to between 2.4-10VDC when operated in non-parasitic mode (performance degrades below 2.4vdc). It is capable of running on parasitic power (the usual steal power from DQ trick) and in this case it appears to be able to measure from 0-10VDC on VDD. Since parasitic mode is set by grounding VDD, this would be quite a physical feat. I'm guessing that the chip switches into parasitic mode when VDD<2.4, but why performance "degrades" as the data sheet states is a mystery.
The chip will be mangled if VDD <=-0.3 or >=+12v. The chip converts temperature (and, not simultaneously, voltage) in 10ms, but accuracy is only +/- 2.0 degrees C. (0.03125 degrees C resolution). I've not used it, although we've contemplated it in a design. /m ------------------------------------------------------- This SF.net email is sponsored by: Splunk Inc. Do you grep through log files for problems? Stop! Download the new AJAX search engine that makes searching your log files as easy as surfing the web. DOWNLOAD SPLUNK! http://sel.as-us.falkag.net/sel?cmd=lnk&kid=103432&bid=230486&dat=121642 _______________________________________________ Owfs-developers mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/owfs-developers
