SMSC USB2640i User Manual

Ultra Fast USB 2.0 Multi-Format Flash Media Controller/USB Hub Combo

SMSC USB2640/USB2641

9

Revision 2.0 (10-03-08)

A default configuration is available in the USB2640/USB2641 following a reset. The
USB2640/USB2641 may also be configured by an external I

2

C EEPROM or via external SPI flash. 

The USB2640/USB2641 supports several OEM selectable features:

„

Compound device support (port is permanently hardwired to a downstream USB peripheral device), 
on a port-by-port basis.

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

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Port power control and over-current detection/delay features

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

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Configure the delay time for turning on downstream port power.

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Bus- or self-powered selection

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Hub port disable or non-removable configurations

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Port signal swapping for easier board layout

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Flexible port mapping and disable sequence. Ports can be disabled/reordered in any sequence to 
support multiple platforms with a single design. The hub will automatically reorder the remaining 
ports to match the host controller's numbering scheme.

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Programmable USB differential-pair pin location.

- Eases PCB layout by aligning USB signal lines directly to connectors

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Programmable USB signal drive strength. Recover USB signal integrity due to compromised 
system environments using 4 levels of signal drive strength.

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Indicate the maximum current that the 2-port hub consumes from the USB upstream port.

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Indicate the maximum current required for the hub controller. 

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Customize vendor ID, product ID, and device ID.

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12-hex digit (max) serial number string

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Customizable vendor specific data by optional use of external serial EEPROM

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28-character manufacturer ID and product string for flash media reader/writer

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LED blink interval or duration