Philips UM10011 Port Power Switch Transistors, Overcurrent Circuit Detection, Power Supply

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Philips Semiconductors

UM10011_4

 

 

 

ISP1521 Hi-Speed USB Hub Demo Board

 

 

 

 

5.5.Port Power Switch Transistors

The hub switches on or off the bus power to each downstream facing port through a low ohmic PMOS transistor.

5.6.Overcurrent Circuit Detection

The integrated analog overcurrent detection circuit of the ISP1521 senses the voltage drop across the power switch. When the port draws too much current, the voltage drop across the power switch exceeds the trip voltage threshold. The overcurrent circuit detects this and automatically switches off the power switch. More information on choosing the switch and trimming the overcurrent detection voltage can be found in the ISP1521 Hi-Speed Universal Serial Bus hub controller data sheet.

5.7.Power Supply

To power up the hub, plug the power supply into the power supply socket (PWR_C1).

Jumper J15 will set the powering mode in the hub’s descriptors as self-powered hub; see

Table 5-2.

Table 5-2: Setting the Power Mode Using J15

J15

Power Mode

Logic State

OFF

Self*

1 (HIGH)

*—Default settings.

J15

 

 

© Koninklijke Philips Electronics N.V. 2004. All rights reserved.

User manual

Rev. 04.00 — 17 June 2004

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Contents UM100114 Contact information Philips SemiconductorsDisclaimer Contents ISP1521 Hub Demo Board Features IntroductionPower Supply Adapter Requirements System RequirementsHub Demo Board Description ISP1521 80-Pin Lqfp PackageGoodLink Indicator Port IndicatorsPower LED Indicator Overcurrent Circuit Detection Port Power Switch TransistorsPower Supply Windows Reporting of the Bus-Powered Mode Windows Reporting of the Self-Powered Mode I2C-Bus InterfaceSchematics Other JumpersISP1521 Eval Board VCC5 VBUS1 VCC5 Vbus Component Placement Layer 1 Top Routing Layer 2 Ground Planes Layer3 Power Planes Layer 4 Bottom Routing Installing the Board Bill of Materials for the ISP1521 Hub Demo Board References

UM10011 specifications

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