DS18B20 multiple sensors

GoForSmoke:

afremont:
Time to look at the datasheet, it tells all. The only difference is that you have to supply extra power when a temp conversion (or EEPROM write) is in progress. The datasheet shows how to do it, it's simple; it takes an extra i/o pin though. You just enable the pin after issuing the conversion command. That in turn bypasses the pull-up resistor on the data line (Q) so that the device has plenty of power to do the temp conversion or write to its EEPROM. Look at the datasheet, they have a nice write-up on how it all works.

Is that for parasite mode only?

Yes it is.