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ISL54222AIRUEVAL1Z Evaluation Board
User ’s Manual
Application Note
July 24, 2009
AN1450.1
Description
The ISL54222AIRUEVAL1Z evaluation board is designed to
provide a quick and easy method for evaluating the
ISL54222A USB Switch IC.
The ISL54222A device is a unique IC. To use this evaluation
board properly requires a thorough knowledge of the
operation of the IC. Refer to the data sheet for an
understanding of the functions and features of the device.
Studying the device’s truth-table along with its pinout
diagram in the data sheet is the best way to get a quick
understanding of how the part works.
A picture of the evaluation board is shown in Figure 1. The
ISL54222A μTQFN IC is soldered onto the evaluation board. It
is located in the center of the board and is designated as U1.
The evaluation board contains USB connectors to allow the
user to easily interface with the IC to evaluate its functions,
features, and performance. For example, with the board
properly powered and configured as shown in Figure 2, you
can control the logic pins, SE and OE, to switch between the
two high-speed USB devices while connected to a single
USB host (computer).
In a typical application, the ISL54222A dual SPDT device is
used to select between two different USB transceiver
sections of a media player. Logic control from a μprocessor
determines which section to connect to the computer. To
change channels, the following sequence would possibly be
followed:
1. A signal would be sent to take the OE pin High, to open
all switches. The off-isolation of the ISL54222A device
would allow the present active channel to properly
disconnect from the computer.
2. The SEL pin would be set to select the other USB
channel.
3. The OE pin would then be taken Low to close the
switches to make the connection between the computer
and the other USB section of the player.
This application note will guide the user through the process
of configuring and using the evaluation board to evaluate the
ISL54222A device.
Picture of Evaluation Board (Top View)
FIGURE 1. ISL54222AIRUEVAL1Z EVALUATION BOARD
Features
? Standard USB Connectors
? Standard Banana Jacks for Power, Ground, V BUS and
Logic Connections
? Jumpers to Allow a Device to be Powered Through the
Host Controller
? Convenient Test Points and Connections for Test
Equipment
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright Intersil Americas Inc. 2009. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
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