Philips ISP1521 Philips Semiconductors ISP1521

Philips Semiconductors ISP1521

Hi-Speed USB hub controller

Product data Rev. 03 — 24 November 2004 15 of 53

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

For global overcurrent detection, an increased voltage drop is needed for the

overcurrent sense device (in this case,a low-ohmic resistor). This can be realized by

using a special power supply of 5.1 V ±3 %, as shown in Figure 6.

The PCB resistance may cause a drop of 25 mV, which leaves 75mV for the power

switch and overcurrent sense device.

PSWn_N pins have integrated weak pull-up resistors inside the chip.

9.1.3 Overcurrent protection mode

The ISP1521 supports all overcurrent protection modes: none, global and individual.

No overcurrent protection mode reporting is selected when pin NOOC = HIGH.

Global and individual overcurrentprotection modes are selected using pins PSWn_N,

following the power switching modes selection scheme; seeTabl e 6.

For the global overcurrent protection mode, only PSW1_N and OC1_N are active;

that is, in this mode, the remaining overcurrent indicator pins are disabled. To inhibit

the analog overcurrent detection, the OC_N pins must be connected to VREF(5V0).

(1) Includes PCB traces, ferrite beads, and so on.

Fig 5. Typical voltage drop components in the self-powered mode using individual overcurrent detection.

5 V

POWER SUPPLY

± 3 % regulated −

+4.85 V (min)

004aaa264

low-ohmic

PMOS switch

ISP1521

power switch

VBUS

D+

D−

GND

SHIELD

4.75 V (min)

downstream

port

connector

hub board

resistance

voltage drop

25 mV

voltage drop

75 mV

(1)

(PSWn_N)

(1) Includes PCB traces, ferrite beads, and so on.

Fig 6. Typical voltage drop components in the self-powered mode using global overcurrent detection.

5.1 V KICK-UP

POWER SUPPLY

± 3 % regulated −

+4.95 V(min)

004aaa265

low-ohmic

PMOS switch

VBUS

D+

D−

GND

SHIELD

4.75 V(min)

downstream

port

connector

hub board

resistance

voltage drop

25 mV

voltage drop

75 mV

low-ohmic

sense resistor

for overcurrent

detection

voltage drop

100 mV

(1)

ISP1521 power

switch

(PSWn_N)

Table 5: Power switching mode: pin conﬁguration

Power switching mode PSW1_N PSW2_N PSW3_N PSW4_N PSW5_N PSW6_N PSW7_N

None ground ground ground ground ground ground ground

Ganged internal

pull-up ground ground ground ground ground ground

Individual internal

pull-up internal

pull-up internal

pull-up internal

pull-up internal

pull-up internal

pull-up internal

pull-up

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