Smaller footprint for USB 2.0 controller

Edited by the Electronicstalk editorial team May 1, 2002

Sunrise Electronics has a new general purpose USB controller chip from NEC which meets the new high-speed USB 2.0 specifications.

Sunrise Electronics has a new general purpose USB controller chip from NEC which meets the new high-speed USB 2.0 specifications and is designed for incorporation into high-speed computer peripherals such as printers, scanners and digital cameras.

The USB 2.0 standard defines data transfer rates up to 480Mbit/s.

NEC's new uPD720122 device fully supports this whilst maintaining compatibility with the USB 1.1 standard, ensuring backward compatibility with all current USB products.

The uPD720122 has been designed to be easy to integrate into designs while offering facilities which increase the effective data-transfer rate achieved, such as bulk IN/OUT buffers which accept the maximum data packet size supported by USB 2.0, as well as interrupt handling provided by a dedicated eight byte buffer.

A general-purpose memory bus allows the uPD720122 to be connected to the CPU in the target design, and this bus can also be used for DMA transfers.

Both 8 and 16bit address and databuses are supported, selected via external control pins on the uPD720122 device.

The new uPD720122 complements NEC's existing range of certified host and hub controllers introduced last year and also available from Sunrise.

Supplied in a 100-pin TQFP (14 x 14mm) package, the uPD720122 is the smallest footprint USB 2.0 device NEC has produced to date and represents the most cost effective route to adding USB 2.0 to a peripheral design.

Sunrise can provide support to a wide range of USB 2.0 designs.

An evaluation board (ET-0138) is available and production quantities of uPD720122 are available now.