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AN1408.0
ISL54211EVAL1Z
Evaluation Board User’s Manual
Description
The ISL54211EVAL1Z evaluation board is designed to
provide a quick and easy method for evaluating the
ISL54211 USB/Audio Switch IC.
The ISL54211 device is an 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 on page 2 of the data sheet is the best way to get a
quick understanding of how the part works.
A picture of the main evaluation board is shown in Figure 1.
The ISL54211 TDFN IC is soldered onto the evaluation
board. It is located in the center of the board and is
designated as U1.
The ISL54211 IC has three modes of operation called Audio
mode, USB mode and Mute mode. The evaluation board
contains standard Audio and USB connectors to allow the
user to easily interface with the IC to evaluate its functions,
features, and performance in the these modes of operation.
For example, when the board is properly powered, a
headphone can be plugged into the headphone jack (J7) and
a stereo source,
such as a MP3 player, can be connected at
the RCA connectors J3 (AUDIO LEFT) and J4 (AUDIO
RIGHT) to play music through the audio switches of the IC.
See Figure 2. You can then turn-off the audio source,
remove the headphones, configure the logic for USB
operation and then attach a USB cable from a computer to
the USB connector J1 (USB TO HOST). This will establish a
connection from the computer through the USB switches of
the IC to the USB device connected at the USB connector J2
(USB TO DEVICE), to send and receive data.
This application note will guide the user through the process
of configuring and using the evaluation board to evaluate the
ISL54211 device in both the Audio mode and the USB mode.
Features
• Standard USB Connectors
• RCA Audio Input Jacks and Headphone Speaker Jack
• Convenient Test Points and Connections for Test
Equipment
Picture of Evaluation Board (Top View)
Board Architecture/Layout
Basic Layout of Evaluation Board
The basic layout of the main board is as follows: Refer to
Figure 1.
• Power and Ground connections are at the top of the board
(J10 and J11).
• Logic control connections are at the top of the board (J12
and J13).
• Audio Source Inputs are at the lower right side of the
board (J3 to J6). Audio outputs are at the lower left side of
the board (J7, J8, J9). Connector J7 is a standard
headphone jack for connecting a 32
Ω
headphone.
• USB connection to an upstream host controller
(Computer) is made at connector J1, located on left under-
side of the board. USB connection to a downstream USB
device is made at connector J2, located on right under-
side of the board.
• Located in the center of the board is the ISL54211 IC (U1).
The evaluation board has a pin 1 dot, to show how the IC
should be oriented on to the evaluation board. The IC pin
1 indicator dot needs to be aligned with the evaluation
board pin 1 dot indicator.
FIGURE 1. ISL54211EVAL1Z EVALUATION BOARD
Application Note
February 13, 2009
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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