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

Datasheet

OEM Selectable Hub Features

A default configuration is available in the USB4640/USB4640i following a reset. The USB4640/USB4640i may also be configured by an external I2C EEPROM or via external SPI ROM flash.

„Compound Device support on a port-by-port basis

- a port is permanently hardwired to a downstream USB peripheral device

„Select over-current sensing and port power control on an individual or ganged (all ports together) basis to match the OEM’s choice of circuit board component selection

„Port power control and over-current detection/delay features

„Configure the delay time for filtering the over-current sense inputs

„Configure the delay time for turning on downstream port power

„Bus- or self-powered selection

„Hub port disable or non-removable configurations

„Flexible port mapping and disable sequencing supports multiple platform designs

„Programmable USB differential-pair pin location eases PCB layout by aligning USB signal lines directly to connectors

„Programmable USB signal drive strength recovers USB signal integrity using 4 levels of signal drive strength

„Indicate the maximum current that the 2-port hub consumes

„Indicate the maximum current required for the hub controller

SMSC USB4640/USB4640i

9

Revision 1.0 (06-01-09)

DATASHEET