Micro/sys Releases High Density StackableUSB Expansion Board with 96 Lines of Digital I/O

Montrose, CA (PRWEB) May 24, 2007

The Micro/sys USB196 is a high density digital I/O board that implements the new StackableUSB standard. The USB196 offers high quantities of digital I/O for OEM systems by providing four 82C55s that support 96 TTL I/O lines. The 8-position DIP switch and 8 LEDs can be used for debugging during system development, for station number, or configuration settings in the final production system. All discrete I/O lines have software programmable pull-ups or pull-downs. Protecting against power sequencing problems, the robust USB196 prevents overload currents with onboard current-limiting resistors.

At the core of the USB196 is a Silicon Laboratories C8051F340 microcontroller unit that runs at 48 MHz. This core is compatible with 8051 architecture and integrates many peripherals such as the 10-bit A/D converter, 2 UARTs, 1 I2C, and 1 SPI bus, all of which are available to the user. Due to a predefined protocol that carries data over the USB, it is not necessary to modify the code which runs on the USB196. In conjunction with this protocol, host applications, via a custom driver, can directly access and control all of the onboard peripherals. Therefore, the only code that needs to be modified to control the USB196 resides on the host CPU. This expansion board also has USB 2.0 compatibility which supports both full speed (12 Mbps) and low speed (1.5 Mbps).

The rugged USB196 is rated for operation over the industrial temperature range of 40

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