Philips ISP1521 9.1 Conguration through I/O pins,

Philips Semiconductors ISP1521

Hi-Speed USB hub controller

Product data Rev. 03 — 24 November 2004 14 of 53

9397 750 13702 © Koninklijke Philips Electronics N.V. 2004. All rights reserved.

9.1 Conﬁguration through I/O pins

9.1.1 Number of downstream facing ports

To discount a physical downstream facing port, connect pins DP and DM of that

downstream facing port to VCC (3.3 V) starting from the highest port number (7); see

Tab le 4.

The sum of physical ports conﬁgured is reﬂected in the bNbrPorts ﬁeld.

9.1.2 Power switching

Powerswitching of downstream ports can be done individually or ganged, where all

ports are simultaneously switched with one power switch.The ISP1521 suppor ts both

modes, which can be selected using input PSWn_N; see Tab le 5.

Voltage drop requirements:Self-powered hubs are required to provide a minimum

of 4.75 V to its output port connectors at all legal load conditions. To comply with

Underwriters Laboratory Inc. (UL) safety requirements, the power from any port must

be limited to 25 W (5 A at 5 V). Overcurrent protection may be implemented on a

global or individual basis.

Assuming a 5 V ±3 % power supply, the worst-case supply voltage is 4.85V. This

only allows a voltage drop of 100 mV across the hub Printed-Circuit Board (PCB) to

each downstream connector. This includes a voltage drop across the:

•Power supply connector

•Hub PCB (power and ground traces, ferrite beads)

•Power switch (FET on-resistance)

•Overcurrent sense device.

The PCB resistance and power supply connector resistance may cause a drop of

25 mV, leaving only 75mV as the voltage drop allowed across the power switch and

overcurrent sense device. The individual voltage drop components are shown in

Figure 5.

Table 4: Downstream facing port number pin conﬁguration

Number of physical

downstream facing port DM1/DP1 DM2/DP2 DM3/DP3 DM4/DP4 DM5/DP5 DM6/DP6 DM7/DP7

715kΩ

pull-down 15 kΩ

pull-down 15 kΩ

pull-down 15 kΩ

pull-down 15 kΩ

pull-down 15 kΩ

pull-down 15 kΩ

pull-down

615kΩ

pull-down 15 kΩ

pull-down 15 kΩ

pull-down 15 kΩ

pull-down 15 kΩ

pull-down 15 kΩ

pull-down VCC

515kΩ

pull-down 15 kΩ

pull-down 15 kΩ

pull-down 15 kΩ

pull-down 15 kΩ

pull-down VCC VCC

415kΩ

pull-down 15 kΩ

pull-down 15 kΩ

pull-down 15 kΩ

pull-down VCC VCC VCC

315kΩ

pull-down 15 kΩ

pull-down 15 kΩ

pull-down VCC VCC VCC VCC

215kΩ

pull-down 15 kΩ

pull-down VCC VCC VCC VCC VCC

Contents

Main ISP1521 Hi-Speed Universal Serial Bus hub controller Universal Serial Bus Specication Rev.2.0 Rev. 03 24 November 2004 Product data 1. General description 2. Features Universal Serial Bus Specication Rev.2.0 3. Applications 4. Abbreviations 5. Ordering information Product data Rev. 03 24 November 2004 4 of 53 6. Block diagram Fig 1. Block diagram. ISP1521 Philips Semiconductors ISP1521 Product data Rev. 03 24 November 2004 5 of 53 7. Pinning information Fig 2. Pin conguration. 7.2 Pin description 7.1 Pinning ISP1521BE Page ISP1521 Hub Demo Board Users Guide Page Page 8. Functional description 8.3 Phase-locked loop clock multiplier 8.4 I2C-bus controller 8.5 Overcurrent detection circuit 8.6 GoodLink 8.7 Power-on reset Fig 4. External clock with respect to power-on reset. Fig 3. Power-on reset timing. Stable external clock is to be available at A. 9. Conguration selections 9.1 Conguration through I/O pins Philips Semiconductors ISP1521 pull-up Fig 6. Typical voltage drop components in the self-powered mode using global overcurrent detection. PSWn_N pins have integrated weak pull-up resistors inside the chip. (1) Includes PCB traces, ferrite beads, and so on. Page 9.2 Device descriptors and string descriptors settings using I2C-bus The I C-bus specication Page 9.2.3 ROM or EEPROM map Page Philips Semiconductors ISP1521 Page Page 10. Hub controller description 11. Descriptors Page Page 12. Hub requests Tab le 23 shows the suppor ted standard USB requests. 12.1 Standard USB requests 12.2 Hub class requests Tab le 24 shows the hub class requests. 12.3 Detailed responses to hub requests Page Page 12.4 Various get descriptors bmRequestType 10000000B bmRequest GET_DESCRIPTOR = 6 13. Limiting values 14. Recommended operating conditions In accordance with the Absolute Maximum Rating System (IEC 60134). 15. Static characteristics Page Page 16. Dynamic characteristics C; test circuit Figure 21; unless otherwise specied. Page TPERIOD is the bit duration corresponding with the USB data rate. Fig 11. Source differential data-to-EOP transition skew and EOP width. TPERIOD is the bit duration corresponding with the USB data rate. tJR is the jitter reference point. Fig 13. Receiver SE0 width tolerance. Fig 12. Receiver differential data jitter. Fig 14. Hub differential data delay and SOP distortion. Fig 15. Hub EOP delay and EOP skew. and T within recommended operating range; V =5V; V =V ; V 17. Application information 17.1 Descriptor conguration selection ISP1521 Fig 18. Adjusting analog overcurrent detection limit (optional). . . 17.3 Self-powered hub congurations ISP1521 Fig 19. Self-powered hub; individual port power switching; individual overcurrent detection. Fig 20. Self-powered hub; ganged port power switching; global overcurrent detection. ISP1521 18. Test information DMn D Fig 22. Full-speed test circuit. Fig 21. High-speed transmitter and receiver test circuit. 19. Package outline LQFP80: plastic low profile quad flat package; 80 leads; body 12 x 12 x 1.4 mm SOT315-1 Fig 23. LQFP80 package outline. 20. Soldering 20.1 Introduction to soldering surface mount packages Data Handbook IC26; Integrated Circuit Packages 20.2 Reow soldering 20.3 Wave soldering 21. Revision history Philips Semiconductors ISP1521 Contact information 22. Data sheet status 23. Denitions 24. Disclaimers 25. Licenses 26. Trademarks Contents