an1451

ISL54214EVAL1Z/ISL54217EVAL1Z
Evaluation Board User’s Manual
®
Application Note
January 23, 2009
AN1451.0
Description
Features
The ISL54214EVAL1Z and ISL54217EVAL1Z evaluation
boards are designed to provide a quick and easy method for
evaluating the ISL54214 and ISL54217 USB 2.0
High Speed x 2 Channels/Stereo Audio Dual SP3T (dual
3-to-1 Multiplexer) Switch ICs.
• Standard USB Connectors
To get an evaluation board with an ISL54214 IC, order P/N:
ISL54214EVAL1Z. To get an evaluation board with ISL54217
IC, order P/N: ISL54217EVAL1Z
Picture of Evaluation Board (Top View)
• RCA Audio Input Jacks and Headphone Speaker Jack
• Convenient Test Points and Connections for Test
Equipment
The ISL54214 and ISL54217 devices are unique ICs. To use
the evaluation board properly requires a thorough
knowledge of the operation of the ICs. Refer to the data
sheets for an understanding of the functions and features of
these devices. Studying the device’s truth-table along with its
pinout diagram in the ISL54214 and ISL54217 data sheets 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 ISL54214 or ISL54217 TQFN IC is soldered onto the
evaluation board. It is located in the center of the board and
is designated as U1.
The ISL54214 or ISL54217 IC has five states or modes of
operation called ALL OFF, USB1, USB2, Audio and Audio
Mute. 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
five modes of operation.
For example, when the board is properly powered, a
headphone can be plugged into the headphone jack, (J20)
and a stereo source, such as a MP3 player can be
connected at the RCA connectors J16 (AUDIO LEFT) and
J18 (AUDIO RIGHT). The S2 and S1 toggle switches on the
board can be put into the High position 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 USB1 operation (S1 = Low, S2 = High) and then
attach a USB cable from a computer to the USB connector
J15 (USB TO HOST). This will establish a connection from
the computer through the USB1 switches of the IC to the
USB device connected at the USB1 connector J13 (USB TO
DEVICE 1), 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
ISL54214 or ISL54217 device in the five modes of operation.
FIGURE 1. ISL54214EVAL1Z/ISL54217EVAL1Z
EVALUATION BOARD
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 through banana connections labeled VDD and
GND (J1 and J2).
2. Logic control connections are at the top of the board
either through the banana connections labeled C1 and
C0 (J4 and J3) or by the toggle switches S2 and S1. Note:
Jumpers JP5 and JP4 must be installed to use the toggle
switches and removed to use the banana connections.
3. Audio Source Inputs are at the lower right side of the
board (J16 - J19). Audio outputs are at the lower left side
of the board (J20, J12, J11). Connector J20 is a standard
headphone jack for connecting a 32Ω headphone.
4. USB connection to an upstream host controller
(Computer) is made at connector J15, located on left side
of the board. USB connections to downstream USB
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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Application Note 1451
devices are made at connectors J13 and J14, located on
right side of the board.
5. Located in the center of the board is the ISL54214 or
ISL54217 IC (U1). The evaluation 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.
Power Supply
The DC power supply connected at banana jacks J1 (VDD)
and J2 (GND) provides power to the part. The IC requires a
2.7V to 4.6V DC power supply for proper operation. The
power supply should be capable of delivering 100µA of
current.
Logic Control
The state of the ISL54214 or ISL54217 device is determined
by the voltage at the C1and C0 logic pins.
Access to the C1 pin is through banana jack J4 (C1) when
jumper JP5 is not installed, and by the toggle switch S2 (C1)
when the JP5 jumper is installed.
Access to the C0 pin is through banana jack J3 (C0) when
jumper JP4 is not installed, and by the toggle switch S1 (C0)
when the JP4 jumper is installed.
The C1 and C0 logic control pins are 1.8V logic compatible,
which allows them to be control via a standard µcontroller.
Logic “0” (LOW) when ≤ 0.5V or floating
Logic “1” (HIGH) when ≥ 1.4V
If C1 and C0 = Logic “0” (LOW), the part will be in the ALL
OFF mode. The audio switches, USB1 switches, and the
USB2 switches will be OFF.
If C1 = Logic “0” (LOW), and C0 are = Logic “1” (HIGH), the
part will be in the USB1 mode. The USB1 switches will be
ON and the USB2 and audio switches will be OFF.
If C1 = Logic “1” (HIGH) and C0 are = Logic “0” (LOW),
(provided the last mode was not the Audio mode) the part
will be in the USB2 mode. The USB2 switches will be ON
and the USB1 and audio switches will be OFF.
If C1 and C0 = Logic “1” (HIGH) the part will be in the Audio
mode. The audio switches will be ON and the USB switches
will be OFF.
If C1 = Logic “1” (HIGH) and C0 are = Logic “0” (LOW),
(provided the last mode was the Audio mode) the part will be
in the Audio mute mode. The audio switches, USB1
switches and the USB2 switches will be OFF. In this mode, a
1kΩ shunt is connected on the COM side of the switch for
improved isolation when driving 10kΩ to 20kΩ amplifier
loads.
Audio Inputs
The evaluation board has two audio inputs labeled AUDIO
LEFT (J16 or J17) and AUDIO RIGHT (J18 or J19). Each of
these inputs have a BNC connector wired in parallel with a
2
RCA jack connector. You can connect an audio
source/generator at either the BNC connector or the RCA
connector.
In a typical application, the left and right outputs of a stereo
source, such as an MP3 player, would be connected to the
RCA jacks J16 and J18, respectfully.
Over a signal range of ±1V (0.707VRMS), these switches
have an extremely low rON resistance variation. They can
pass ground referenced audio signals with very low
distortion (<0.05% THD+N) when delivering 15.6mW into a
32Ω headphone speaker load. A 3VP-P signal is acceptable
but performance will degrade.
The audio input channels are AC coupled with 200µF
capacitors. These capacitors remove any DC voltage from
the audio signals and reference them to ground of the
device. These capacitors can be shorted out by installing
jumpers at JP14 and JP15.
If the audio source being connected to the evaluation board
already has internal AC coupling capacitors at the output of
its drivers, then the capacitors on the evaluation board
should be shorted out by installing jumpers at JP14 and
JP15. This will prevent further attenuation of the low
frequency content of the audio signal due to the increase of
the high-pass corner frequency resulting from the evaluation
board capacitor in series with the audio source capacitor.
Audio Outputs
The evaluation board has a standard headphone jack
labeled HEADPHONE JACK (J20). A 32Ω stereo
headphone should be plugged into this jack.
The BNC connector J11 (COM-) is in parallel with the audio
left line of the headphone jack and the D- line of the J15
(USB To HOST) connector. The BNC connector J12 (COM+)
is in parallel with the audio right line of the headphone jack
and the D+ line of the J15 (USB To DEVICE) connector.
These BNC connectors can be used to connect resistive
loads and/or test equipment to evaluate the performance of
the IC.
Also in parallel with the COM - and COM + lines are a bank
of common audio load resistors (32Ω, 10kΩ, and 20kΩ) that
can be connected for testing. To connect a resistor, just
install the appropriate jumper. For example, to connect the
32Ω load to the COM- and COM + lines, you would install
jumpers on JP8 and JP13.
USB Connections
A “B” type USB receptacle labeled “USB TO HOST” (J15) 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, and the part is put in the
USB1 mode, the USB1 switches will be turned ON and will
be able to communicate with the USB device connected at
AN1451.0
January 23, 2009
Application Note 1451
J13 (USB to DEVICE 1). In the USB2 mode, the USB2
switches will be turned ON and the computer will be able to
communicate with the USB device connected at J14 (USB to
DEVICE 2).
The board has two “A” type USB receptacles located on the
right side of the board, labeled USB TO DEVICE 1 (J13) and
USB to DEVICE 2 (J14). USB devices can be plugged
directly into these receptacles or through a standard USB
cable.
In USB1 mode, the USB host controller and USB device 1
will be connected through the internal USB1 switches of the
IC. In USB2 mode, the USB host controller and USB device
2 will be connected through the internal USB2 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.
Note: Before connecting the USB host controller at
connector J15, the headphones must be removed from the
headphone speaker jack, J20. This will prevent the audio
load from interfering with USB signal transmission.
TABLE 1. BOARD COMPONENT DEFINITIONS
DESIGNATOR
DESCRIPTION
U1
ISL54214IRTZ or ISL54217IRTZ IC
J15
“B” type USB Receptacle
J13, J14
“A” type USB Receptacle
J16, J17
Left Stereo Audio Input
J18, J19
Right Stereo Audio Input
J20
Headphone Speaker Jack
J11
COM- BNC Connector
J12
COM+ BNC Connector
J1
VDD Positive Connection
J2
VDD GND Connection
J4
C1 Logic Control
J3
C0 Logic Control
J5
VBUS Connection for USB Device 1
J6
VBUS Connection for USB Device 2
JP1, JP2, JP3 D-/D+ Differential Probe Connection
The main purpose of the ISL54214 or ISL54217 device is to
allow the use of a common USB and Audio Headphone
Connector in Personal Media Players and other portable
battery powered equipment. Either a headphone will be in
the common connector to play music, or a USB cable from a
computer will be in the common connector to transmit digital
data into and out of the various transceiver sections of the
Media Player.
JP4, JP5
Jumpers to Enable S1 (C0) and S2 (C1) Toggle
Switches
JP6
Jumper to Enable VBUS voltage from Computer via
J15 Connector to USB Device 1
JP7
Jumper to Enable VBUS voltage from Computer via
J15 Connector to USB Device 2
The BNC connector J11 (COM-) is in parallel with the D- line
of the J15 USB connector. The BNC connector J12 (COM+)
is in parallel with the D+ line of the J15 USB connector.
These BNC connectors can be used to connect test
equipment to evaluate the performance of the IC.
3
AN1451.0
January 23, 2009
Application Note 1451
DC POWER
SUPPLY
+5.0V
+
DC POWER
SUPPLY
+3.3V
+
- COMPUTER
C1
GND
VDD
J2
J1
USB PORT
JP5
C0
VBUSCH1 VBUSCH2
C0
JP7
USB TO
DEVICE1
USB TO HOST
J13
U1
J15
JP3
USB TO
DEVICE2
JP1
J20
HEADPHONE
JACK
J12
C6
J11
COM +
COM -
JP8 JP9 JP10
JP11JP12 JP13
C7
JP15
C5
C4
JP14
JP2
J14
AUDIO RIGHT
J19
J18
J17
J16
AUDIO LEFT
USB
DEVICE 2
C1
JP6
USB PORT
L
J6
USB
DEVICE 1
L
J5
USB PORT
J3
J4
S2
S1
JP4
H
H
L
R
AUDIO SOURCE
32Ω 10kΩ 20kΩ 32Ω 10kΩ 20kΩ
ISL5421XEVAL1Z EVALUATION BOARD
FIGURE 2. BASIC EVALUATION TEST SETUP BLOCK DIAGRAM
Using The Board (Refer to Figure 2)
Lab Equipment
The equipment, external supplies and signal sources
needed to operate the board are listed in the following:
1. +3V to 5V DC Power Supplies
2. Stereo Audio Source (MP3/Radio/CD Player) or Audio
Generator
3. Headphone Set or Audio Analyzer/Oscilloscope
4. Standard USB High-Speed Cables
5. Computer with USB Port
6. Two USB Devices (i.e. USB Memory Stick, MP3 Player
with USB Port, etc.)
Initial Board Setup Procedure
1. Attach the main evaluation board to a DC power supply
at J1 (VDD) and J2 (GND). Positive terminal at J1 and
negative terminal at J2. The supply should be capable of
delivering 3V to 5V and 100mA of current. Set the supply
voltage to 3.3V.
2. Connect a DC power supply at J5 (VBUSCH1) and J2
(GND) (positive terminal at J5 and negative terminal at
J2). The supply should be capable of delivering 5V and
100mA of current. Set the supply voltage to 5V. This
supply provides the required VBUS voltage for the USB
4
device connected at J13 (USB TO DEVICE 1). No jumper
should be installed on jumper JP6.
3. Install jumpers at JP4, JP5, and JP7. Note: Jumper
installed at JP7 will allow the USB device connected at
J14 (USB TO DEVICE 2) to get its VBUS voltage from the
computer through connector J15 (USB TO HOST).
Jumpers installed at JP4 and JP5 will allow control of the
C1 and C0 logic pins by the S2 (C1) and S1 (C0) toggle
switches.
4. Connect the stereo audio source left channel to J16 RCA
connector or J17 BNC connector and right channel to J18
RCA connector or J19 BNC connector.
5. Connect one USB device to the USB “B” type receptacle,
J13 (USB TO DEVICE 1).
6. Connect the other USB device to the USB “B” type
receptacle, J14 (USB TO DEVICE 2).
Audio Mode Operation
1. Install headphone in the headphone jack, J20. No USB
cable should be connected at the J15 (USB TO HOST)
connector.
2. Logic Control: Put S2 and S1 toggle switches in the “H”
(high) position. You will now be in Audio mode (2.3Ω
audio switches are ON).
3. Turn the audio source ON. You should hear the music in
the headphones.
AN1451.0
January 23, 2009
Application Note 1451
4. Toggle S1 to the “L” position to mute the audio signal.
Return it to the “H” position to play the music.
5. You can observe the audio signals at the output of the IC
on an oscilloscope or audio analyzer by using the J11and
J12 BNC connectors. Connect to J11 for left audio and
J12 for right audio.
USB1 Mode Operation
1. Turn OFF audio stereo source.
2. Remove headphone from J20 Headphone Jack.
3. Logic Control: Put S2 and S1 toggle switches in the “L”
(low) position. You will now be in ALL OFF mode (All
switches of the device will be OFF).
4. Logic Control: Put S2 toggle switch in the “L” (low)
position and the S1 toggle switch in the “H” (high)
position. You will now be in USB1 mode (6.2Ω USB
channel 1 switches are ON).
5. Connect USB cable from computer USB port to the USB
“A” type receptacle, J15 (USB TO HOST) on the
evaluation board. The computer should indicate that it is
connected to the USB device connected at the J13 (USB
TO DEVICE 1) connector.
6. You will now be able to send and receive data between
the computer and USB device 1.
7. You can observe the D- and D+ USB digital signals on an
oscilloscope or other test equipment by connecting to the
JP1 and JP3 test points located on the board.
8. Remove the 0Ω resistors R1 and R2 when evaluating the
performance (i.e. eye diagram, etc.) of the high speed
USB signal. Removal of these resistors disconnects the
headphone jack (J20), the BNC connectors (J11, J12)
and the bank of load resistors (R7, R8, R9, R10, R11,
R12, R13, and R14) from the USB differential lines.
These components, when connected will degrade the
USB signal. These components will not be there in an
actual application.
You can switch between the two USB devices by toggling the
S2 and S1 switches. It is recommended when switching
between USB devices to take both toggle switches to the “L”
(low position) momentarily turning all switch channels OFF
and then take the appropriate toggle switch to the “H”
position to connect the USB device.
If you disconnect the USB cable from J15 and take the S2
and S1 toggle switches to the “H” position, the IC will return
to Audio mode. You can now plug the headphone set into the
headphone jack, turn the audio source ON to once again
play music.
USB2 Mode Operation
1. Turn OFF audio stereo source.
4. Logic Control: Put S2 toggle switch in the “H” (high)
position and the S1 toggle switch in the “L” (low) position.
You will now be in USB2 mode (6.2Ω USB channel 2
switches are ON).
5. Connect USB cable from computer USB port to the USB
“A” type receptacle, J15 (USB TO HOST) on the
evaluation board. The computer should indicate that it is
connected to the USB device connected at the J14 (USB
TO DEVICE 2) connector.
6. You will now be able to send and receive data between
the computer and USB device 2.
7. You can observe the D- and D+ USB digital signals on an
oscilloscope or other test equipment by connecting to the
JP1 and JP2 test points located on the board.
8. Remove the 0Ω resistors R1 and R2 when evaluating the
performance (i.e. eye diagram, etc.) of the high speed
USB signal. Removal of these resistors disconnects the
headphone jack (J20), the BNC connectors (J11, J12)
and the bank of load resistors (R7, R8, R9, R10, R11,
R12, R13, and R14) from the USB differential lines.
These components when connected will degrade the
USB signal. These components will not be there in an
actual application.
You can switch between the two USB devices by toggling the
S2 and S1 switches. It is recommended when switching
between USB devices to take both toggle switches to the “L”
(low position) momentarily turning all switch channels OFF
and then take the appropriate toggle switch to the “H”
position to connect the USB device.
If you disconnect the USB cable from J15 and take the S2
and S1 toggle switches to the “H” position, the IC will return
to Audio mode. You can now plug the headphone set into the
headphone jack, turn the audio source ON to once again
play music.
Test Points
The board has various test points for connecting probes to
make measurements. The test points available are
described in Table 2.
TABLE 2. TEST POINT DESCRIPTIONS
DESIGNATOR
TP1
VDD Test Point
TP2
Ground Test Point
TP3
C0 Logic Test Point
TP4
C1 Logic Test Point
TP5
Test Point
JP1
D-/D+ Differential Probe Connection - COM Side
of Switch
JP2
D-/D+ Differential Probe Connection - USB
Device 2 Side of Switch
JP3
D-/D+ Differential Probe Connection - USB
Device 1Side of Switch
2. Remove headphone from J20 Headphone Jack.
3. Logic Control: Put S2 and S1 toggle switches in the “L”
(low) position. You will now be in ALL OFF mode (All
switches of the device will be OFF).
5
DESCRIPTION
AN1451.0
January 23, 2009
Application Note 1451
J13
A
JP3
4
2
1
DIFF PROBE
3
1
DIFF PROBE
3
TP4
1
TP3
1
2
JP5
1
A
3
2
JP1 DIFF PROBE
4
A
A
4 3
A
J12 1
COM+
2
5
4 3
COM5
J11
1
2
1
4 3
A
HEADPHONE JACK
2
5
3
J20
4
5
1 JP8 2
AA
1
TP5
100µF C7
100µF C6
1
2
JP15
1
2
J19
4 3
A
A
3
J18
1
AUDIO R
2
4
3
A
1
2
5
J17
4
J16
1
2
AUDIO L
100µF C5
100µF C4
1
2
JP14
1
TP1
1
A
A
1 1
2 2
A
0.01µF
0.1µF
C3
4.7µF
C2
9 9
U1
QFN
8
12 PIN 8
3 3 PACKAGE
7
7
13 13
EP
S1
2
JP4
1
1
TP2
1
GND
J2
C1
1
4
1 JP9 2
0
2
1 JP10 2
R1
3
0
VDD
J1
1
1 JP11 2
R2
J3
1
USB
TO
HOST
1 JP12 2
R7
16.2
R8
16.2
R9
10k
R10
20k
R11
10k
R12
20k
R13
16.2
12
11
10
J15
12
11
10
4
4
5
6
6
USB
3
4
5
6
3
1
2
1
2
1 JP13 2
R14
16.2
J4
1
C1
3
1
2
C0
1
2
JP7
1
2
JP6
S2
J6
J5
1
VBUSCH1 VBUSCH2
1
5
A
6
TO
DEVICE 1
4
4
USB
3
1
3
2
1 2
A
2
4
JP2
A
5
6
4
4
3
1
2
5
1 2 3
J14
DEVICE 2
TO
USB
Board Schematic
Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time without notice. Accordingly, the reader is cautioned to
verify that the Application Note or Technical Brief is current before proceeding.
For information regarding Intersil Corporation and its products, see www.intersil.com
6
AN1451.0
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