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USB2514I-HZH

Industrial Temperature Rated USB 2.0 High-Speed 4-Port Hub Controller

SMSC -> Microchip 

Industrial Temperature Rated USB 2.0 High-Speed 4-Port Hub Controller

Datasheet

Chapter 4 Configuration Options

4.1

4.1.1

4.1.1.1

4.1.2

4.2

4-Port Hub

SMSC’s USB 2.0 4-Port Hub is fully specification compliant to the Universal Serial Bus Specification

Revision 2.0 April 27, 2000 (12/7/2000 and 5/28/2002 Errata). Please reference Chapter 10 (Hub

Specification) for general details regarding Hub operation and functionality.

For performance reasons, the 4-Port Hub provides 1 Transaction Translator (TT) per port (defined as

Multi-TT configuration), divided into 4 non-periodic buffers per TT.

Hub Configuration Options

The SMSC Hub supports a large number of features (some are mutually exclusive), and must be

configured in order to correctly function when attached to a USB host controller. There are three

principal ways to configure the hub: SMBus, EEPROM, or by internal default settings (with or without

pin strapping option over-rides). In all cases, the configuration method will be determined by the

CFG_SEL2, CFG_SEL1 and CFG_SEL0 pins immediately after RESET_N negation.

Power Switching Polarity

The selection of active state “polarity” for the PRTPWR pins is made by a strapping option only (the

PRTPWR_POL pin).

Note: If PRTPWR_POL is not an available pin on the package, the hub will support active high power

controllers only!

VBus Detect

According to Section 7.2.1 of the USB 2.0 Specification, a downstream port can never provide power

to its D+ or D- pull-up resistors unless the upstream port’s VBUS is in the asserted (powered) state.

The VBUS_DET pin on the Hub monitors the state of the upstream VBUS signal and will not pull-up

the D+ resistor if VBUS is not active. If VBUS goes from an active to an inactive state (Not Powered),

Hub will remove power from the D+ pull-up resistor within 10 seconds.

36 QFN and 48 QFN Feature Differences

36 QFN

N/A

N/A

N/A

N/A

Available

Available

Table 4.1 36 QFN and 48 QFN Feature Differences

48 QFN

Available

Available

Available

Available

N/A

N/A

FEATURE

48MHz clock input mode

External 1.8V regulators

Port LED Indicators

Port Swap Strapping Options

Only Active High Port Power Control is supported in 36 QFN package

Boost Default Level is used; see Table 4.2, "Internal Default, EEPROM and

SMBus Register Memory Map"

Revision 1.98 (11-19-07)

18

DATASHEET

SMSC USB2514i

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