Philips ISP1122 ,

Philips Semiconductors ISP1122

USB stand-alone hub

Product speciﬁcation Rev. 03 — 29 March 2000 23 of 48

9397 750 07002 © Philips Electronics N.V. 2000. All rights reserved.

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

•Power supply connector

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

•Power switch (FET on-resistance)

•Overcurrent sense device.

PCB resistance and power supply connector resistance may cause a drop of 25 mV,

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

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

Figure 6.

In case of 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 7.

11.1.2 Bus-powered hubs

Bus-powered hubs are guaranteed to receive a supply voltage of 4.5V at the

upstream port connector and must provide a minimum of 4.4 V to the downstream

port connectors. The voltage drop of 100 mV across bus-powered hubs includes:

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

•Power switch (FET on-resistance)

•Overcurrent sense device.

(1) Includes PCB traces, ferrite beads, etc.

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

handbook, full pagewidth

5 V

POWER SUPPLY

± 3% regulated −

+4.85 V(min)

MGR781

low-ohmic

PMOS switch

ISP1122

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)

(1) Includes PCB traces, ferrite beads, etc.

Fig 7. Typical voltage drop components in self-powered mode using global overcurrent detection.

handbook, full pagewidth

5.1 V KICK-UP

POWER SUPPLY

± 3% regulated −

+4.95 V(min)

MGR782

low-ohmic

PMOS switch

ISP1122

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

low-ohmic

sense resistor

for overcurrent

detection

voltage drop

100 mV

(1)

Contents

Main ISP1122 Universal Serial Bus stand-alone hub Universal Serial Bus Specication Rev. 1.1 USB Specication Rev. 1.1 Rev. 03 29 March 2000 Product specication 3. Ordering information 4. Block diagram This is a conceptual block diagram and does not include each individual signal. th ISP1122 5. Pinning information 5.1 ISP1122D (SO32) and ISP1122NB (SDIP32) Fig 2. Pin conguration SO32. Fig 3. Pin conguration SDIP32. 5.1.2 Pin description 5.1.1 Pinning Page Page 5.2 ISP1122BD (LQFP32) 5.2.1 Pinning Fig 4. Pin conguration LQFP32. 5.2.2 Pin description ISP1122BD Page 6. Functional description 6.1 Analog transceivers USB Specication Rev. 1.1 6.2 Philips Serial Interface Engine (SIE) 6.3 Hub repeater USB Specication Rev. 1.1 6.4 End-of-frame timers 6.5 General and individual port controller 7. Modes of operation Philips Semiconductors ISP1122 8. Endpoint descriptions 8.1 Hub endpoint 0 (control) 8.2 Hub endpoint 1 (interrupt) Philips Semiconductors ISP1122 9. Host requests 9.1 Standard requests 9.2 Hub specic requests Page 9.3 Descriptors The ISP1122 hub controller supports the following standard USB descriptors: USB Specication Rev. 1.1 Page USB Specication Rev. 1.0 9.4 Hub responses Page 10. I2C-bus interface 10.1 Protocol C-bus and how to use it The I 10.2 Hardware connections 10.3 Data transfer Philips Semiconductors ISP1122 11. Hub power modes USB Specication Rev.1.1 11.1 Voltage drop requirements 12. Overcurrent detection 12.1 Overcurrent circuit description 12.2 Power switch selection 12.3 Tuning the overcurrent trip voltage 12.4 Reference circuits Power switches 1 to 5 are low-ohmic PMOS devices as specied inSection 12.2. ISP1122 Fig 10. Mode 5: self-powered hub; individual port power switching; individual overcurrent detection. Power switch is low-ohmic PMOS device as specied inSection 12.2. Fig 11. Mode 1: self-powered hub; ganged port power switching; global overcurrent detection. Power switches 1 to 4 are low-ohmic PMOS devices as specied inSection 12.2. Fig 12. Mode 4: bus-powered hub; individual port power switching; individual overcurrent detection. Product specication Rev. 03 29 March 2000 29 of 48 Power switch is low-ohmic PMOS device as specied inSection 12.2. Fig 13. Mode 0: bus-powered hub; ganged port power switching; global overcurrent detection. 13. Limiting values In accordance with the Absolute Maximum Rating System (IEC 60134). 14. Static characteristics 15. Dynamic characteristics =0V;T on D = 1.5 k C; C = 50 pF; R =0V;T on D = 1.5 k C; C = 50 pF; R Fig 15. Source differential data jitter. Fig 16. Source differential data-to-EOP transition skew and EOP width. Fig 17. Receiver differential data jitter. Fig 18. Receiver SE0 width tolerance. Fig 19. Hub differential data delay and SOP distortion. [1] fSCL =164fXTAL. [2] Rise time is determined by Cb and pull-up resistor value Rp (typ. 4.7 k). Fig 20. Hub EOP delay and EOP skew. DD SS IH IL 16. Test information Fig 22. Load impedance for D+ and D- pins. Fig 21. I2C-bus timing. 17. Package outline Fig 23. SO32 package outline. SO32: plastic small outline package; 32 leads; body width 7.5 mm SOT287-1 SDIP32: plastic shrink dual in-line package; 32 leads (400 mil) SOT232-1 Fig 24. SDIP32 package outline. LQFP32: plastic low profile quad flat package; 32 leads; body 7 x 7 x 1.4 mm SOT358-1 Fig 25. LQFP32 package outline. c 18. Soldering 18.1 Introduction Data Handbook IC26; Integrated Circuit Packages 18.2 Surface mount packages 18.3 Through-hole mount packages 18.4 Package related soldering information 19. Revision history 20. Data sheet status 21. Denitions 22. Disclaimers 23. Licenses 24. Trademarks Philips Semiconductors - a worldwide company Internet: http://www.semiconductors.philips.com Contents