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Application Note 1450
Board Architecture/Layout
Basic Layout of Evaluation Board
The basic layout of the main board is as follows: (Refer to
Figure 1).
1. Power and Ground connections are at the top of the
board at banana jacks (J1 and J2).
2. Logic connections, SEL and OE , are at the top of the
board at banana jacks (J4 and J3).
3. USB connection to an upstream host controller
(Computer) is made at J5, located on the left side of the
board.
4. USB connections to downstream USB devices are made
at connectors J6 and J7, located on right side of the
board.
5. V BUS voltage for the USB devices are made through
banana jacks J8 and J9. Optionally, V BUS for the USB
devices can be connected to the Host Controller V BUS
through jumpers JP4 and JP5.
6. Located in the center of the board is the ISL54222A IC
(U1). The eval board has a pin 1 dot, to show how the IC
should be oriented onto the evaluation board. The IC pin
1 indicator dot needs to be aligned with the evaluation
board pin 1 dot indicator.
IC Power Supply
A DC power supply connected at banana jacks J1 (V DD ) and
J2 (GND) provides power to the ISL54222A IC. The IC
requires a 1.8VDC to 3.3VDC power supply for proper
operation. The power supply should be capable of delivering
100μA of current.
V BUS Power Supply
A DC power supply connected at banana jacks J8
(VBUSCH1) and J9 (VBUSCH2) provides the V BUS voltage
required by the USB devices. The devices require a DC
power supply in the range of 4.4V to 5.25V for proper
operation. The power supply should be capable of delivering
100μA of current.
The J8 banana jack is connected to the VBUS pin of the J6
“A” type USB receptacle. The J9 banana jack is connected
to the VBUS pin of the J7 “A” type USB receptacle.
The V BUS voltage can be provided from the USB host
controller (computer) by installing a jumper at either JP4 or
JP5.
With a jumper at JP4, the V BUS voltage from the J5 “B” type
USB receptacle gets routed to the J6 USB connector. With
this jumper installed, no DC supply should be connected at
the J8 (VBUSCH1) banana jack.
With a jumper at JP5, the V BUS voltage from J5 “B” type
USB receptacle gets routed to the J7 USB connector. With
this jumper installed, no DC supply should be connected at
the J9 (VBUSCH2) banana jack.
2
Logic Control
The state of the ISL54222A device is determined by the
voltage at the SEL pin and the OE pin. Access to the SEL pin
is through the banana jack J4 (SEL), and access to the OE
pin is through the banana jack J3 (OE).
If SEL is driven Low (to ground) and EN = Low (to ground),
the high-speed (HS) Channel 1 switches will be ON. In this
state, the USB host controller (computer) connected at J5
will be connected through to the USB device connected at J6
and data will be able to be transmitted between the
computer and the device.
If SEL is driven High (>1.4V) and EN = Low (to ground), the
high-speed (HS) Channel 2 switches will be ON. In this
state, the USB host controller (computer) connected at J5
will be connected through to the USB device connected at J7
and data will be able to be transmitted between the
computer and the device.
If OE = High (>1.4V), all switches will be OFF. Neither device
will be connected through to the host controller.
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 then 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.
USB Connections
A “B” type USB receptacle labeled “USB TO HOST” (J5) is
located on the left side of the board. This receptacle should
be connected using a standard USB cable to the upstream
USB host controller, which is usually a PC computer or hub.
When this connection is made, the ISL54222A device will
connect the computer through to the USB device determined
by the voltage at the SEL logic control pin.
An “A” type USB receptacle labeled “USB TO DEVICE 1”
(J6) is located on the right side of the board. The USB device
can be plugged directly into this receptacle or through a
standard USB cable.
An “A” type USB receptacle labeled “USB TO DEVICE 2”
(J7) is located on the right side of the board. The USB device
can be plugged directly into this receptacle or through a
standard USB cable.
AN1450.1
July 24, 2009
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