DESIGN OF A CUSTOM ASIC INCORPORATING CAN™ AND 1 ...

2.4 Types of Devices
Dependent on their function, 1 – Wire® devices are available in a variety of packages
such as single components in an integrated circuit (IC) package and in some cases a portable
form called an iButton that resembles a watch battery. Manufacturers also produce products
that are more complex than a single component, and use the 1 – Wire® bus to communicate. A 1
– Wire® device may be just one of many components on a circuit board within a product, but are
also found in isolation within devices or attached to a device being monitored.
2.4.1 1 – Wire® Device Packaging
Most 1 – Wire® devices are available in durable, stainless steel containers about the size
of four stacked dimes called iButtons. 1 – Wire® devices are also offered in conventional
transistor (TO – 92) and IC packages (TSOC, SOIC, SOT23). Designed for contact applications
and easy attachment, the 2 – contact SFN (Single line of contacts, Flat, No leads) package
accommodates parasitically powered 1 – Wire® devices. The 16mm-diameter stainless steel
iButton package protects 1 – Wire® devices from harsh environments, making them suitable
for indoor and outdoor use [10]. Many devices are also available in flip chip and UCSP (Ultra
Chip Scale Package) versions. In addition to the various device package types for 1 – Wire®
devices, 1 – Wire® peripherals also come in a wide variety including various serial- and parallel-
port adaptors for PCs, probes, fob and holders, and a wide array of iButton attachments. A 1 –
Wire® peripheral can be thought of as an auxiliary device that connects to a 1 – Wire® network
and allows communication between 1 – Wire® devices and a host computer or 1 – Wire®
devices and 1 – Wire® networks.
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