I am trying to communicate with an IButton DS1920. I am using the ONEWIRE.pbp example. According to the datasheet it communicates the same as the DS18S20 or DS18B20. I am able to communicate with the IButton but the temperatures are all over the place. From 32, 84, 112, 225, etc... I am using a 4.7K ohm pull up resistor to 5V. Also tested at 3.6V same results.

Is there anything special with the DS1920? Has anyone used this and willing to share their success or failures?

Note: I am only wanting to communicate with just one at a time! No onewire networks!

Thanks in advance,

Scott