Supported by a complete set of royalty-free USB host device drivers, the bridge chips create transparent interfaces between USB and serial ports which require no firmware changes. For legacy applications, the OXUSB95x chips provide a simple means to upgrade peripherals from serial to USB communication. Power economy is assured by the integral USB suspend/resume function.
Handling USB transaction and control data processing is the bridge chip's advanced 16-bit micro-controller. Operating at 5MIPs and featuring 3Kbytes of on-board RAM and masked ROM, the controller also offers the flexibility and processing power to enable development of peripherals able to process data before it is passed to the host PC. The task optimisation this achieves further improves system performance.
An additional independent UART is provided for code development and debug. Supporting transmit and receive data rates up to 115Kbps, this UART can also be configured as an extra serial communications port. A universal E2PROM interface is a standard feature of both ICs and two multi-purpose GPIOs are offered by the OXUSB950. Packaging for the 3.3-volt OXUSB950 and OXUSB954 bridge chips is respectively 44-pin and 100-pin LQFP.
Through distribution channels the price of the OXUSB950 is $2.60 in 1,000 piece quantities and the price of the OXUSB954 is $7.79 in 1,000 piece quantities.
Oxford Semiconductor Andy Thorne, +44 (0)1235 824 900 Email Contact www.oxsemi.com or Publitek Limited Rob Davies, +44 (0)1225 470 000 Email Contact www.publitek.com