The difference between LinkUSB and LinkUSBi is the addition of a DS2401 ID chip in the LinkUSBi.
LinkUSB™ is an advanced intelligent USB 2.0 full speed 1-Wire® interface. It uses superior digital and analog methods to accomplish more reliable operation on a variety of network communications, as well as some diagnostic tools.
The LinkUSB has been designed to operate reliably on long or short 1-Wire busses. It has a special analog interface designed to match impedances and slew rate controls, and smart cable pre-charge.
LinkUSB drivers were designed in cooperation with Dallas Semiconductor Corp.
The same strong drivers used in the Link45 (tested to 1,000 feet on cat5 cable with one sensor attached), the power advantage of the USB serial bus, the integrity of injection molding and a very competive price, make the LinkUSB™ a major enhancement to the 1-Wire world.
The 1 foot cable eliminates the strain point between the LinkUSB's electronics and the USB connector; a problem that continues to plague the DS9490R.
The LinkUSB™ works great with 1-Wire Viewer, the free 1-Wire viewing and logging application from Maxim using the DS9097U emulation mode. If you have any problem getting 1-Wire viewer to work, try our 1-Wire Viewer tips and tricks page.
The LinkUSB Manual is a good resource to learn how to use the LinkUSB™.