USB2640 datasheet(5/60 Pages) MICROCHIP

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DS00001947C-page 5

USB2640/USB2641

• 8051 8-bit microprocessor

- 60 MHz - single cycle execution

- 64 KB ROM; 9 KB RAM

• Internal regulator for 1.8 V core operation

• Optimized pinout improves signal flow, easing implementation and allowing for improved signal integrity treatment

1.1.2

Software Features

• Optimized for low latency interrupt handling

• Hub and flash media reader/writer configuration from a single source: External I2C ROM or external SPI ROM

• EEPROM update via USB

• Please see the USB2640/USB2641 Software Release Notes for additional software features

1.2

OEM Selectable Features

1.2.1

Hub

A default configuration is available in USB2640/USB2641 following a reset. The USB2640/USB2641 may also be con-

figured by an external I2C EEPROM or via external SPI ROM 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.

• 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.

• 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 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.

• Programmable USB differential-pair pin location.

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

• Programmable USB signal drive strength. Recover USB signal integrity due to compromised system environ-

ments using 4 levels of signal drive strength.

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

• Indicate the maximum current required for the hub controller.

1.2.2

FLASH MEDIA CONTROLLER

• Customize vendor ID, product ID, and device ID.

• 12-hex digit (max) serial number string

• Customizable vendor specific data by optional use of external serial EEPROM

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

• LED blink interval or duration

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