ISP1122 USB Hub Demonstration Board User`s Manual Revision 1.01
Contents
1. J lower EMI pMOS Th switches Built in Over current detection GoodLink LED 8kV in circuit i yy ESD EJ USB Spec 1 1 Bus or Self compliant powered Philips Semiconductors Asia Product Innovation Centre Visit http www flexiusb com Interconnectivity 26 November 1998 Page 5 ISP1122 USB Hub Demonstration Board User s Manual 2 BOARD DESCRIPTION 2 1 Configuration modes The INDV OPTION and SP BP_N pins determine hub configuration modes Users can either set these signals to logic high or low The INDV and OPTION pins can also be used for connections to external EZPROM This allows for customized Vendor ID and Product ID among other configuration modes The E2PROM contents will be discussed in later text The meanings of the three configuration pins are described in Table 1 Table 1 Mode configuration pins oO Gang power switching and global over current protection mode 1 Individual power switching and individual over current protection mode Both power switch and over current protection functions are SDA active Either one of Power switch control or over current protection functions are active depending on self powered or bus powered configuration For self powered operation the power switch control is optional and for bus powered operation the over current protection is optional 1 Self powered or hybrid powered mode Local Power Lost Indication 1 signifies a pull up high2. 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 So the ISP1122 can be configured into eight different modes Table 2 shows these configuration modes Table 2a Mode selection table o o 0 f GLL234N GPSW N Inactive GOCN o 0 1 f GLL234N GPSWN Inactive GOCN o 1 0 f GLL234N GPSW N Inactive Inactive L0 1 1 GLI234N GLS5N Inactive GOCN 1 1 0 PSWLI234 N GLL234 N GLSN OCL234N OCSN Inactive OCX_N pins need to be tied to Vcc Philips Semiconductors Asia Product Innovation Centre Visit http www flexiusb com Interconnectivity 26 November 1998 Page 6 ISP1122 USB Hub Demonstration Board User s Manual Table 2b Mode selection table ctd Mode Self Bus Power Switch GoodLink Over current Remarks Powered control Protection Global Ganged and bus powered Self powered Global Ganged and self powered Self powered Global No power switch control Individual Self powered Individual No Power switch control Without Port 5 The demo board
3. BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES Philips Semiconductors Asia Product Innovation Centre Visit http www flexiusb com Interconnectivity 26 November 1998 Page 3 ISP1122 USB Hub Demonstration Board User s Manual PREFACE The Philips Semiconductors Hub ISP1122 is a state of the art 3 generation stand alone USB hub controller IC that complies with the latest USB Spec Rev 1 1 The major priorities for us during the design were 1 Interoperability 2 Reduction in the overall system cost 3 System designer friendly product We have relied on more than 3 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 We estimate that the ISP1122 enables cost reductions exceeding the cost of the IC itself Our overall ambition is to provide you with the Peace of Mind for using our products in the total system solution We welcome your comments and suggestions
4. ST IH E I 5 H HE 4 it ib ii o H H z3i opf Bat 512 s 24 Figure 2 Schematic diagram of the ISP1122 demo board Philips Semiconductors Asia Product Innovation Centre Visit http www flexiusb com Interconnectivity 26 November 1998 Page 11 ISP1122 USB Hub Demonstration Board User s Manual 3 3 Bill of Material BOM List Part Type Designator 0 01uF High frequency decoupling capacitors C3 C12 0 1uF High frequency decoupling capacitor C6 1uF TANT Low frequency decoupling capacitors C4 C13 4 7uF TANT Upstream bulk capacitor C25 150uF Downstream bulk capacitors for meeting voltage droop requirement C20 C21 C22 C23 C24 0 1uF Snubber capacitors for power switching C7 C8 C9 C10 C11 1k ohm Snubber resistors for power switching R34 R35 R36 R37 R38 100k ohm Open drain pull up resistors for power switch control R43 R44 R45 R46 R47 ojaa Orn nm nm 1 5k ohm 595 Upstream pull up resistor R21 15k ohm 5 Downstream pull down resistor package R40 15k ohm 5 Downstream port 5 pull down resistor R22 R23 18 ohm 1 Impedance matching resistors R1 R2 R3 R4 R5 R6 R7 R8 R9 R10 R11 R12 1M ohm Pull down resistor for self bus powered mode and local power loss detection R29 1uF Capacitor for self bus powered mode detection C15 22pF
5. implements modes 4 and 5 as selected by switch SW1 see Table 3 In these two modes the hub supports individual power control and individual over current protection for downstream ports Table 3 Bus Self powered selection switch 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 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 k bit 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 need to be pulled up to Vcc a 3 3k ohm value is recommended On power on the ISP1122 detects the presence of the EEPROM through the Signature byte ZAAh If the signature is correct the content of the EZPROM will overwrite the default setting The content of the EEPROM is listed in Table 4 and the meaning of the configuration bits are listed in Table 5 Table 4 EEPROM Content idVendor lower byte default CCh idVendor higher byte default 04h idProduct lower b
6. to help us improve For more information about the ISP1122 and the latest updates to the design support documents please visit the web site http www flexiusb com With Best Regards Team Members of the Asia Product Innovation Center Philips Semiconductors Asia Product Innovation Centre Visit http www flexiusb com Interconnectivity 26 November 1998 Page 4 ISP1122 USB Hub Demonstration Board User s Manual 1 INTRODUCTION The ISP1122 demonstration board simply called demo board in the following text is designed for evaluating the features and functionality of the ISP1122 IC This manual explains the schematic of the ISP1122 demo board demonstrates the PCB layout shows the complete BOM Bill of Material and describes the detailed usage of every switch 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 GoodLink 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 pending UL approved pending 8 kV ESD Optional VID PID in Configurable from external EEPROM 2 to 5 ports TE 6MHz crystal for Individual
7. Crystal oscillator capacitors C1 C2 3 3k ohm 12C pull up resistors R32 R33 330 ohm LED current limiting resistors R15 6MHz Crystal oscillator x1 5V 2 5A DC JACK DC power supply jack for self powered mode P1 USB A Receptacle Downstream port connectors J1 J2 J8 J4 J5 USB B Receptacle Upstream port connector JO Ferrite beads Beads for EMI and in rush current limiting B1 B2 B3 B4 B5 B6 B7 B8 B9 B10 B11 B12 ISP1122 Philips Semiconductors USB Hub controller SDIP32 package UO ISP1122 Philips Semiconductors USB Hub controller SO32 package U1 PCA8581C PCF8582C 2 24C00 24C01 EEPROM with I2C interface U2 PHP109 PMOS power transistor Q1 Q2 Q3 Q4 Q5 LED LED1 Switch DIP 6 Switch for number of downstream ports configuration SW3 Switch SPDT EEPROM enable switch SW2 Switch SPDT Self Bus powered selection switch SW TEST POINT TP1 Philips Semiconductors Asia Product Innovation Centre Visit http www flexiusb com Interconnectivity 26 November 1998 Page 12 ISP1122 USB Hub Demonstration Board User s Manual 3 4 Component Placement Downstream Downstream Downstream Downstream Downstream Port 1 Port 2 Port 3 Port 4 Port 5 o Bi TON 1 e BS nen Of I e Ras R36 EX R4R3ReRSRSR7 RIO RSB Upstream Port Figure 3 Component placement
8. I issues 2 Power traces need to be thick to meet USB spec voltage drop requirement 3 Put 150 uF 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 Crystal oscillator should be placed close to the ISP1122 6 Decoupling capacitors for the ISP1122 Vcc and V3 3 signals should be placed close to the pins nd Philips Semiconductors Asia Product Innovation Centre Visit http www flexiusb com Interconnectivity ISP1122 USB Hub Demonstration Board User s Manual 3 Appendix 3 1 ISP1122 Pin Diagram 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 PSW1_N GL1_N DP2 DM2 DPO DMO DP1 DM1 DP5 DM5 INDV SCL OPTION SDA RESET_N XTAL2 XTAL1 ISP1122 PSWA N GL4 N Figure 1 Pin diagram of ISP1122 3 2 Schematic Diagram Philips Semiconductors Asia Product Innovation Centre Visit http www flexiusb com 26 November 1998 Page 9 PSW5 N GL5 N GPSW N Interconnectivity 26 November 1998 Page 10 ISP1122 USB Hub Demonstration Board User s Manual TN CI VEU PORT AA TASA
9. PHILIPS Philips Semiconductors Interconnectivity 26 Nov 1998 ISP1122 USB Hub Demonstration Board User s Manual Revision 1 01 Philips Semiconductors Asia Product Innovation Centre Visit http www flexiusb com Interconnectivity 26 November 1998 Page 2 ISP1122 USB Hub Demonstration Board User s Manual 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
10. of ISP1122 demo board Philips Semiconductors Asia Product Innovation Centre Visit http www flexiusb com Interconnectivity 26 November 1998 Page 13 ISP1122 USB Hub Demonstration Board User s Manual 3 5 PCB Layout Figure 4 Top Layer PCB Layout Philips Semiconductors Asia Product Innovation Centre Visit http www flexiusb com Interconnectivity 26 November 1998 Page 14 ISP1122 USB Hub Demonstration Board User s Manual VN alib Tos NEN igs te Pdl Tuin omo ooor ooos oco Jaco y vO me 0 o 1e Figure 5 Bottom Layer PCB Layout Philips Semiconductors Asia Product Innovation Centre Visit http www flexiusb com
11. wn 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 EEPROM EEPROM enabled EEPROM disabled 2 3 Number of Downstream Ports The ISP1122 number of downstream ports can also be configured from 5 to 2 For bus powered mode USB spec only allows for 4 downstream ports The port number configuration is set through switch SW3 and is listed in Table 7 Philips Semiconductors Asia Product Innovation Centre Visit http www flexiusb com Interconnectivity 26 November 1998 Page 8 ISP1122 USB Hub Demonstration Board User s Manual Table 7 Number of Downstream Ports Setting SW3 1 12 3 10 5 8 Number of Downstream 2 11 4 9 6 7 Ports OFF OFF OFF 5 ON OFF OFF 4 ON ON OFF 3 ON ON ON 2 Illegal Note Bus powered mode can only have 4 downstream ports according to 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 Selection Default Self Bus powered Bus powered EEPROM No EEPROM disabled Number of Downstream Ports 4 2 5 PCB layout consideration The following PCB layout considerations are employed Route signal traces on the top layer as much as possible The bottom layer is reserved for ground routing This should minimize EM
12. yte default 2 22h idProduct higher byte default 2 11h Signature AAh Philips Semiconductors Asia Product Innovation Centre Visit http www flexiusb com Interconnectivity 26 November 1998 Page 7 ISP1122 USB Hub Demonstration Board User s Manual Table 5 Configuration Bit Bit_ Nam Vaue Meaning OPTION Refer to mode selection table INDV JRefertomodeselectiontable Modifies the Hub Descriptor Field PwrOn2PwrGood PwrOn2PwrGood 100 ms 32h 500 ms FAh Disable String Descriptor Enable String Descriptor String is Philips Semiconductors and SP1122 Disable internal analog overcurrent detection circuit When disabled the overcurrent pins OCX_N convert to digital TTL level Enable internal analog overcurrent detection Circuit Modifies the Configuration Descriptor Field MaxPower 100 mA 32h 500 mA FAh 0 mA 00h Note denotes the internal default value when EEPROM is not present String Descriptor Enable Internal Analog Overcurrent Detection Enable MaxPower Although the CO 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 CO OPTION 0 C1 INDV 1 in order to work in this demo board The EEPROM can be disabled through switch SW2 as sho
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