USB4624 datasheet(15/68 Pages) SMSC

15 / 68 page

USB 2.0 HSIC Hi-Speed 4-Port Hub Controller

Datasheet

SMSC USB4624

Revision 1.0 (06-17-13)

DATASHEET

System Reset

Input

RESET_N

I_RST

This active-low signal allows external hardware to

reset the device.

Note:

The active-low pulse must be at least

5us wide. Refer to Section 8.4.2,

"External Chip Reset (RESET_N)," on

page 53 for additional information.

Crystal Input

XTAL1

ICLK

External 24 MHz crystal input

Reference

Clock Input

REFCLK

ICLK

Reference clock input. The device may be

alternatively driven by a single-ended clock

oscillator. When this method is used, XTAL2

should be left unconnected.

Crystal

Output

XTAL2

OCLK

External 24 MHz crystal output

External USB

Transceiver

Bias Resistor

RBIAS

A 12.0k

Ω (+/- 1%) resistor is attached from

ground to this pin to set the transceiver’s internal

bias settings.

Suspend

Output

SUSPEND

This signal is used to indicate that the entire hub

has entered the USB suspend state and that

VBUS current consumption should be reduced in

accordance with the USB specification. Refer to

Section 8.6, "Suspend (SUSPEND)," on page 54

for additional information.

Note:

SUSPEND must be enabled via the

Protouch configuration tool.

SOF

Synchronized

8KHz Clock

Output

SOF

This signal outputs an 8KHz clock synchronized

with the USB Host SOF.

Note:

SOF output is controlled via the

SOF_ENABLE bit in the

UTIL_CONFIG1 register

Detect

Upstream

VBUS Power

VBUS_DET

Detects state of upstream bus power.

When designing a detachable hub, this pin must

be connected to the VBUS power pin of the

upstream USB port through a resistor divider

(50k

Ω by 100kΩ) to provide 3.3V.

For self-powered applications with a permanently

attached host, this pin must be connected to

either 3.3V or 5.0V through a resistor divider to

provide 3.3V.

In embedded applications, VBUS_DET may be

controlled (toggled) when the host desires to

renegotiate a connection without requiring a full

reset of the device.

Table 3.1 Pin Descriptions (continued)

NUM PINS

NAME

SYMBOL

BUFFER

TYPE

DESCRIPTION

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