USB4640 datasheet(16/64 Pages) SMSC

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High Speed Inter-Chip (HSIC) USB 2.0 Hub and Flash Media Controller

Datasheet

Revision 1.0 (06-09-09)

SMSC USB4640/USB4640i

DATASHEET

PRTCTL[3:2]

I/OD6PU

USB Power Enable

As an output, these pins enable power to downstream USB

peripheral devices and have weak internal pull-up resistors. See

Section 6.3, "Port Power Control" for diagram and usage instructions.

As an input, when the power is enabled, these pins monitor the over-

current condition. When an over-current condition is detected, the

pins turn the power off.

RBIAS

I-R

USB Transceiver Bias

A 12.0 k

Ω, ±1.0% resistor is attached from VSS to this pin in order

to set the transceiver's internal bias currents.

XTAL1 (CLKIN)

ICLKx

24 MHz Crystal Input or External Clock Input

This pin can be connected to one terminal of the crystal or it can be

connected to an external 24 MHz clock when a crystal is not used.

XTAL2

OCLKx

24 MHz Crystal Output

This is the other terminal of the crystal or it is left open when an

external clock source is used to drive XTAL1(CLKIN).

SECURE DIGITAL INTERFACE

SD_D[7:0]

I/O8PU

Secure Digital Data 7-0

These are the bi-directional data signals SD_D0 - SD_D7 with weak

pull-up resistors.

SD_CLK

Secure Digital Clock

This is an output clock signal to the SD/MMC device.

SD_CMD

I/O8PU

Secure Digital Command

This is a bi-directional signal that connects to the CMD signal of the

SD/MMC device. The bi-directional signal has a weak internal pull-

up resistor.

GPIO15 /

SD_nCD

I/O6

This general purpose pin may be used either as input, edge sensitive

interrupt input, or output. Custom firmware is required to activate this

function.

I/O8PU

Secure Digital Card Detect GPIO

This is a GPIO designated by the default firmware as the Secure

Digital card detection pin and has an internal pull-up.

Table 6.1 USB4640/USB4640i Pin Descriptions (continued)

SYMBOL

48-PIN

QFN

BUFFER

TYPE

(Table 6.2)DESCRIPTION

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