USB UARTs

Exar USB UART devices are designed for peripheral or inter-system communication and offer up to four UART ports in an ultra-compact package. These USB UART bridges are designed for serial communication devices where space is at a premium. Such peripherals include keyboards, mice, barcode scanners, receipt printers and wireless modules. Exar offers the industry’s smallest USB UART devices targeted for these applications. The XR21B1411 and XR21V1410, for example, are delivered in 3mm by 3mm QFN packages.

All of Exar’s USB UART products are designed for reliability in consumer and industrial environments. Error checking is built in with Exar’s “Wide Mode” feature. This enables software to check error and status bits concurrently with data. For applications where the USB interface may be disconnected and reconnected while a COM port is still open, Exar provides the XRUSB1 Windows driver that eliminates the need to close the COM port in the host application. To ensure robust operation and reliability in consumer and industrial environments, these bridging devices also offer the industry’s highest level of ESD protection of up to ±15kV HBM.

Development is simple with Exar’s USB UART bridging products. The devices work with the standard software drivers in Windows, Linux, Android and Mac OS X. For those designers who need to get to market quickly, enhanced features such as RS-485 Half-Duplex Control and 9-bit or Multidrop Mode can be enabled in Exar’s USB UART devices to simplify software and hardware development. Custom software drivers and applications are also available or for those instances where a standard driver is not available or where unique functionality is required. For example, Exar USB UARTs are easily configured for any non-standard baud rate over 300bps and the GPIOs are readily tailored for enhanced functionality. All the custom Windows drivers are certified to the Microsoft WHQL/HCK standard to ensure compatibility and reliable performance.


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