3
AN1358.0
June 23, 2008
ISL54207 device will sense the VBUS voltage from the
computer, and will go into USB mode. High Speed USB
signals can be passed between J4 and J12.
An “A” type USB receptacle labeled USB TO DEVICE (J12)
is located on the right underside of the board. The USB
device can be plugged directly into this receptacle or through
a standard USB cable.
In USB mode the USB host controller and USB device will
be connected through the internal USB switches of the IC.
The USB switches are bi-directional which allow the host
(computer) and downstream USB device to both send and
receive data.
JP1 and JP2 permit the connection of differential probes for
monitoring of the USB signals. JP1 is used for monitoring on
the device side. JP2 is used for monitoring on the host side.
In addition, BNC connectors J9 (D-) and J10 (D+) can be
connected in parallel to J12 for monitoring the USB signals
on the device side using an oscilloscope. Normally, J9 and
J10 are not connected to the USB signal path. If the user
requires BNC connections to the USB signals on the device
side, then R
1
and R
2
on the evaluation board can be
populated with 0
Ω
resistors. R
1
and R
2
are located between
the J9 and J10 BNC connectors.
Note: Before connecting the USB host controller at
connector J4, the A/V connections must be disconnected (or
set to high impedance) from the VIDEO OUT and MONO
AUDIO OUT connectors (J5-J8). This will prevent the
audio/video load from interfering with USB signal
transmission.
Application
The main purpose of the ISL54207 device is to allow the use
of a common USB and Audio/Video Connector in Personal
Media Players and other portable battery-powered
equipment. Either a TV monitor will be in the common
connector to play video or a USB cable from a computer will
be in the common connector to transmit digital data, such as
music videos or MP3 songs into the memory of the Media
Player.
Board Component Definitions
DESIGNATOR
DESCRIPTION
U1
ISL54207IRUZ IC
J1
Ground Connection
J2
V
DD
Positive Connection
J3
VBUS Logic Input
J4
“B” type USB Receptacle
J5, J6
VIDEO OUT Outputs
J7, J8
MONO AUDIO OUT Outputs
J9
USB (D-) BNC Connector
J10
USB (D+) BNC Connector
J11
CTRL Logic Input
J12
“A” type USB Receptacle
J13, J14
VIDEO IN Inputs
J15, J16
MONO AUDIO IN Inputs
JP1, JP2
D-/D+ Differential Probe Connection
Application Note 1358
