Philips Semiconductors
Interconnectivity
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May 19, 1999
ISP1122 USB Hub Demonstration Board
User’s Manual
Revision 1.02
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ISP1122 USB Hub Demonstration Board - User’s Manual
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This is a legal agreement between you (either an individual or an entity) and Philips Semiconductors. By accepting this
product, you indicate your agreement to the disclaimer specified herein.
DISCLAIMER
PRODUCT IS DEEMED ACCEPTED BY RECIPIENT. THE PRODUCT IS PROVIDED “AS IS” WITHOUT
WARRANTY OF ANY KIND. TO THE MAXIMUM EXTENT PERMITTED BY APPLICABLE LAW, PHILIPS
SEMICONDUCTORS FURTHER DISCLAIMS ALL WARRANTIES, INCLUDING WITHOUT LIMITATION
ANY IMPLIED WARRANTIES OF MERCHANT ABILITY, FITNESS FOR A PARTICULAR PURPOSE, AND
NONINFRINGEMENT. THE ENTIRE RISK ARISING OUT OF THE USE OR PERFORMANCE OF THE
PRODUCT AND DOCUMENTATION REMAINS WITH THE RECIPIENT. TO THE MAXIMUM EXTENT
PERMITTED BY APPLICABLE LAW, IN NO EVENT SHALL PHILIPS SEMICONDUCTORS OR ITS
SUPPLIERS BE LIABLE FOR ANY CONSEQUENTIAL, INCIDENTAL, DIRECT, INDIRECT, SPECIAL,
PUNITIVE, OR OTHER DAMAGES WHATSOEVER (INCLUDING, WITHOUT LIMITATION, DAMAGES
FOR LOSS OF BUSINESS PROFITS, BUSINESS INTERRUPTION, LOSS OF BUSINESS INFORMATION,
OR OTHER PECUNIARY LOSS) ARISING OUT OF THIS AGREEMENT OR THE USE OF OR INABILITY
TO USE THE PRODUCT, EVEN IF PHILIPS SEMICONDUCTORS HAS BEEN ADVISED OF THE
POSSIBILITY OF SUCH DAMAGES.
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Table of Contents
PREFACE .....................................................................................................................................................................4
1 INTRODUCTION......................................................................................................................................................5
1.1 Demo Board Features..........................................................................................................................................5
2 BOARD DESCRIPTION ...........................................................................................................................................6
2.1 Configuration Modes...........................................................................................................................................6
2.2 EEPROM Support...............................................................................................................................................7
2.3 Number of Downstream Ports..............................................................................................................................9
2.4 Factory Default Setting........................................................................................................................................9
2.5 PCB Layout Considerations.................................................................................................................................9
3 Appendix.................................................................................................................................................................10
3.1 ISP1122 Pin Diagram........................................................................................................................................10
3.2 Bill of Material (BOM)......................................................................................................................................11
3.3 Component Placement.......................................................................................................................................12
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ISP1122 USB Hub Demonstration Board - User’s Manual
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PREFACE
The Philips Semiconductors Hub ISP1122 is a state of the art, 3rd generation, stand-alone USB hub controller IC that
complies with the latest USB Spec Rev 1.1. The major considerations for this board are:
1. Interoperability
2. Reduction in the overall system cost
3. Ease of use
We have relied on more than three years of our USB design and customer support experience to achieve these
objectives. Today our USB products already provide an industry benchmark for the interoperability tests. Since
interoperability problems result in the most expensive failures in the field, we have further tightened the design
specifications to address many ambiguities. The IC has integrated many functions and offers features that reduce the
major components of the total system cost. We have employed many design techniques to reduce the EMI emissions,
increase the ESD resiliency and improve the manufacturing test criteria to insure a high quality product.
Our ultimate aim is to provide you with peace of mind when using our products in the total system solution. We
welcome your comments and suggestions to help us improve. For more information about the ISP1122 and the latest
updates to the design support document, please visit the web site http://www.flexiusb.com/
With Best Regards,
Team Members of the Asia Product Innovation Center
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1 INTRODUCTION
The ISP1122 demonstration board (henceforth referred to as demo board) is designed for evaluating the features and
functionality of the ISP1122 integrated circuit (IC). This manual explains the schematic of the ISP1122 demo board,
demonstrates the PCB layout, shows the Bill of Material (BOM) and describes the switches on the board.
1.1 Demo Board Features
• USB Spec Rev 1.1 compliant
• Selectable bus or self/hybrid-powered operation
• Configurable number of downstream ports from 2 to 5
• Customizable Vendor ID and Product ID through EEPROM
• Individual power switching and individual overcurrent protection
• Hub health indicator through GoodLinkTM LED
• Verified interoperability with many systems and peripherals
(Check the continuously updated Interoperability report on the web site)
• FCC Part 15 , Subpart J, Class B compliant
• 8 kV in-circuit ESD protection
Bus- or self-powered
GoodLink™ LED Individual pMOS
switches (built-in
overcurrent detection)
Optional VID/PID in
external EEPROM
6 MHz crystal for lower EMI
USB Spec 1.1 compliant
Configurable from 2 to 5 ports
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2 BOARD DESCRIPTION
2.1 Configuration Modes
The INDV, OPTION and SP/BP_N pins determine the hub configuration modes. Users can set these signals to logic
high or low. The INDV and OPTION pins can also be used for connections to external EEPROM. This allows for
customized Vendor ID and Product ID among other configuration modes. The contents of the EEPROM will be
described later.
The three configuration pins are described in Table 1.
Table 1 Mode Configuration Pins
Name Value Description Other Usage
0Gang power switching and global overcurrent protection modeINDV 1* Individual power switching and individual overcurrent protection
mode
SCL
0Both power switch and overcurrent protection functions are
active
OPTION
1* Only one function is active: in self-powered mode, the power
switch control is inactive; in bus-powered operation, the
overcurrent protection is inactive
SDA
0Bus-powered modeSP/BP_N 1Self-powered or hybrid powered mode Local Power
Lost Indication
1* signifies a pull-up high.
Note: The ISP1122 also supports hybrid self-powered mode. In this mode, the hub controller draws power from
upstream Vbus and local power is used for downstream ports. Hybrid powered mode is advantageous to differentiate
between a disconnected and an unpowered device. This makes it possible to keep communicating between the host and
the device/hub even if local power is lost.
Each composite setting of the three pins determines one configuration mode of the hub. Therefore, ISP1122 can be
configured into eight modes. Table 2 shows these configuration modes. For a detailed description of these power
management modes, refer to the “ISP1122 Power Management Design Guide” document.
Table 2a Mode Selection Table
Mode INDV OPTION SP/BP_N PSW1,2,3,4_N PSW5_N OC1,2,3,4_N OC5_N
0 0 0 0 GL1,2,3,4_N GPSW_N Inactive GOC_N
1 0 0 1 GL1,2,3,4_N GPSW_N Inactive GOC_N
2 0 1 0 GL1,2,3,4_N GPSW_N Inactive Inactive
3 0 1 1 GL1,2,3,4_N GL5_N Inactive GOC_N
4 1 0 0 PSW1,2,3,4_N Inactive OC1,2,3,4_N Inactive
5 1 0 1 PSW1,2,3,4_N PSW5_N OC1,2,3,4_N OC5_N
6 1 1 0 PSW1,2,3,4_N Inactive Inactive Inactive
7 1 1 1 GL1,2,3,4_N GL5_N OC1,2,3,4_N OC5_N
Inactive OCX_N pins must be tied to Vcc.
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Table 2b Mode Selection Table (Continued)
Mode Self-/Bus-
Powered Power Switch
control GoodLink Overcurrent
Protection Remarks
0Bus-powered Ganged Yes* Global Ganged and bus powered
1Self-powered Ganged Yes* Global Ganged and self powered
2Bus-powered Ganged Yes* Inactive No overcurrent
3Self-powered Inactive Yes Global No power switch control
4Bus-powered Individual* No Individual* Individual and bus powered
5Self-powered Individual No Individual Individual and self powered
6Bus-powered Individual* No Inactive No overcurrent
7Self-powered Inactive Yes Individual No Power switch control
* Without Port 5
The demo board implements modes 4 and 5 using switch SW1 (see Table 3). In these two modes, the hub supports
individual power control and individual overcurrent protection for downstream ports.
Table 3 Bus/Self-Powered Selection Switch
SW1 Selection
1-3 Bus powered
1-2 Self/Hybrid powered
WARNING:
When supplying power through the DC jack, make sure that SW1 is at position 1-2 indicating a self-
powered mode. If SW1 is at position 1-3 (bus-powered mode), the upstream supply and the local supply
will be shorted!
2.2 EEPROM Support
INDV and OPTION pins can also be connected to an external serial EEPROM for Vendor ID, Product ID customization
and configuration setting. The interfacing protocol is I2C. The ISP1122 acts as the master and the EEPROM as the
slave. The I2C clock frequency generated by the ISP1122 is slightly less than 100 kbits/s to support low end EEPROM.
The following EEPROM models have been proven suitable: PCA8581, PCF8582C-2, 24C00, 24C01. Both the SCL
(OPTION) and SDA (INDV) pins must be pulled up to Vcc; a 3.3 kilo-ohm value is recommended.
On power on, ISP1122 detects the presence of the EEPROM through the Signature byte (=AAh). If the signature is
correct, the content of the EEPROM will overwrite the default setting. Table 4 lists the EEPROM’s contents and Table
5 describes the configuration bits.
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Table 4 EEPROM Content
Address Content
0idVendor lower byte (default = CCh)
1idVendor higher byte (default = 04h)
2idProduct lower byte (default = 22h)
3idProduct higher byte (default = 11h)
4C7 C6 C5 C4 C3 C2 C1 C0
5Signature = AAh
Table 5 Configuration Bits
Bit Name Value Meaning
C0 OPTION Refer to mode selection table
C1 INDV Refer to mode selection table
C2 RESERVED 0* Should always be programmed to ‘0’
C3 PwrOn2PwrGood 0*
1
Modifies the Hub Descriptor Field PwrOn2PwrGood
100 ms (32h)
500 ms (FAh)
C4 String Descriptor
Enable
0*
1Disable String Descriptor
Enable String Descriptor (String is “Philips Semiconductors” and
“ISP1122”)
C5 Internal Analog
Overcurrent
Detection Enable
0
1*
Disable internal analog overcurrent detection circuit. When
disabled, the overcurrent pins OCX_N convert to digital (TTL)
level.
Enable internal analog overcurrent detection circuit
C7:6 MaxPower 00*
01
1X
Modifies the Configuration Descriptor Field MaxPower
100 mA (32h)
500 mA (FAh)
0 mA (00h)
Note: * denotes the internal default value when the EEPROM is not present.
Although the C0 (OPTION) and C1 (INDV) bits can be programmed to any value, the demo board hardware only
supports Modes 4 and 5. That means these two bits must be programmed with
C0 (OPTION) = 0
C1 (INDV) = 1
for this demo board to work.
The EEPROM can be disabled through switch SW2 as shown in Table 6. When the EEPROM is not present, switch
SW2 has to be set to “EEPROM disabled” state to correctly configure the board in the right mode of operation (Modes 4
or 5).
Table 6 EEPROM Enable/Disable Switch
SW2 EEPROM
1-3 EEPROM enabled
1-2 EEPROM disabled
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2.3 Number of Downstream Ports
The number of downstream ports for ISP1122 is configurable from 2 to 5. For bus-powered mode, the USB spec only
allows for 4 downstream ports. Table 7 lists the port number configuration, which is set through switch SW3.
Table 7 Number of Downstream Ports Setting (SW3)
1-12
2-11 3-10
4-9 5-8
6-7 Number of
Downstream Ports
OFF
ON
ON
ON
OFF
OFF
ON
ON
OFF
OFF
OFF
ON
5
4
3
2
Other combinations Illegal
Note: Bus-powered mode can only have 4 downstream ports according to the USB spec.
2.4 Factory Default Setting
The factory default setting of the configuration switches are shown in Table 8.
Table 8 Factory Default Setting
Switch Selection Default
SW1 Self/Bus-powered Bus-powered
SW2 EEPROM No EEPROM (disabled)
SW3 Number of Downstream Ports 4
2.5 PCB Layout Considerations
The following PCB layout considerations are employed:
1. Route signal traces on the top layer as much as possible. The bottom layer is reserved for ground routing. This
should minimize EMI issues.
2. Power traces must be thick to meet USB spec voltage drop requirement.
3. Put 150 µF capacitors as close as possible to the downstream ports. These capacitors, together with ferrite beads,
minimize voltage droop upon downstream ports hot insertion.
4. Route each pair of the D+ and D- lines close and parallel to each other and their length should be equalized. This
will ensure good symmetrical differential signal swing that enhances interoperability and also lower EMI.
5. Crystal oscillator should be placed close to ISP1122.
6. Decoupling capacitors for the ISP1122 Vcc and V3.3 signals should be placed close to the pins.
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3 Appendix
For schematic diagram and PCB layout, refer to their respective .SCH and .PCB files.
3.1 ISP1122 Pin Diagram
ISP1122
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
32
31
30
29
28
18
26
25
24
23
22
21
20
19
17
27
V3.3
PSW2_N/GL2_N
GND
DM3
DP3
VCC
OC1_N
OC2_N
OC3_N
OC4_N
OC5_N/GOC_N
DM4
DP4
SP/BP_N
HUBGL_N
PSW3_N/GL3_N PSW4_N/GL4_N
PSW5_N/GL5_N/GPSW_N
XTAL1
XTAL2
RESET_N
OPTION/SDA
INDV/SCL
DM5
DP5
DM1
DP1
DM0
DP0
DM2
DP2
PSW1_N/GL1_N
Figure 1 Pin Diagram of ISP1122
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3.2 Bill of Material (BOM)
Part # Part Type Designator Qty
10.01µF ceramic capacitors C26,C27,C28,C29,C40,C41 6
20.1µF ceramic capacitor C3, C6, C7,C8,C9,C10,C11 7
31µF TANT capacitors C4, C13,C16 3
44.7µF TANT capacitor C25 1
5150µF Electrolytic capacitor C20, C21, C22, C23, C24 5
622pF ceramic capacitor C1, C2 2
747pF ceramic capacitor C30, C31, C32, C33, C34, C35,
C36, C37, C38, C39 10
8100 kilo-ohm 0805 R43, R44, R45, R46, R47 5
91.5 kilo-ohm 5% 0805 R21 1
10 10 kilo-ohm 5% 0805 R14 1
11 15 kilo-ohm 5% 0805 R22, R23, R24, R25, R26, R27,
R28, R29,R30 10
12 18 ohm 1% 0805 R1, R2, R3, R4, R5, R6, R7, R8,
R9, R10, R11, R12 12
13 3.3 kilo-ohm 0805 R32, R33 2
14 330 ohm 0805 R15 1
15 47 kilo-ohm 0805 R34, R35, R36, R37, R38 5
16 Ferrite beads – Murata BLM31P221SG FB1, FB3, FB5, FB7, FB9, FB11,
FB13, FB15, FB17, FB19, FB21,
FB23
12
17 Common mode choke filter- Murata PLP3216S551SL2 FB2, FB6, FB10, FB14, FB18 5
18 6 MHz Crystal oscillator X1 1
19 5V/2.5A DC jack P1 1
20 USB “A” Receptacle (Downstream port connectors) J1, J2, J3, J4, J5 5
21 USB “B” Receptacle (Upstream port connector) J0 1
22 ISP1122. Philips Semiconductors USB Hub controller (SO32
package) U1 1
23 PCA8581C/PCF8582C-2/24C00/24C01. EEPROM with I2C
interface U2 1
24 PHP109. PMOS power transistor Q1, Q2, Q3, Q4, Q5 5
25 LED LED1 1
26 Switch DIP-6 SW3 1
27 Switch SPDT SW2 1
28 Switch DPDT SW1 1
29 TEST POINT TP1 1
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3.3 Component Placement
Figure 2 Component Placement of the ISP1122 Demo Board
Downstream
Port 2
Downstream
Port 1
Downstream
Port 3
Downstream
Port 4
Downstream
Port 5
