Exar XR21B1411 USB UART解决方案
Exar公司的XR21B1411是增强性能带USB接口的通用异步接收和发送器(UART),其USB接口和全速USB 2.0标准兼容,支持12Mbps USB数据传输速率,内部时钟可编程成6, 12, 24 或 48 MHz,因此不需要外接晶体/振荡器. 128字节TX FIFO,384字节RX FIFO以及7, 8或 9 数据位,主要用在手持设备,外接转换器,以电池为能源设备,蜂窝数据设备, 工厂自动化和过程控制以及工业应用.本文介绍了XR21B1411主要特性,方框图以及XR21B1411评估板电路图.
XR21B1411 ENHANCED 1-CH FULL-SPEED USB UART
The XR21B1411 (B1411) is an enhanced Universal Asynchronous Receiver and Transmitter (UART) with a USB interface. The USB interface is fully compliant to Full Speed USB 2.0 specification that supports 12 Mbps USB data transfer rate. The USB interface also supports USB suspend, resume and remote wakeup operations.
The B1411 operates from an internal clock that is programmable to 6, 12, 24 or 48 MHz. Therefore, no external crystal / oscillator is required as in previous generation UARTs. With the fractional baud rate generator, any baud rate up to 12 Mbps can be accurately generated using the internal clock.
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