XR21B1411 ENHANCED 1-CH FULL-SPEED USB UART MAY 2018 REV. 1.2.2 FEATURES GENERAL DESCRIPTION 15kV HBM ESD on USBD+/USBD- The XR21B1411 is an enhanced Universal Asynchronous Receiver and Transmitter (UART) with USB 2.0 Compliant, Full-Speed (12 Mbps) a USB interface. The USB interface is fully compliant Supports USB suspend, resume and remote to Full Speed USB 2.0 specification that supports 12 wakeup operations Mbps USB data transfer rate. The USB interface also supports USB suspend, resume and remote wakeup Unique preprogrammed USB serial number operations. Enhanced UART Features The XR21B1411 operates from an internal clock that Data rates up to 12 Mbps is programmable to 6, 12, 24 or 48 MHz. Therefore, Fractional Baud Rate Generator no external crystal / oscillator is required as in previous generation UARTs. With the fractional baud 128 byte TX FIFO rate generator, any baud rate up to 12 Mbps can be 384 byte RX FIFO accurately generated using the internal clock. 7, 8 or 9 data bits The large 128-byte Tx FIFO and 384-byte Rx FIFO of 1 or 2 stop bits the XR21B1411 help to optimize the overall data Odd, even, mark, space or no parity throughput for various applications. The automatic Automatic Hardware (RTS/CTS or DTR/DSR) transceiver direction control feature simplifies both Flow Control the hardware and software for half-duplex RS-485 applications. If required, the multidrop (9-bit) mode Automatic Software (Xon/Xoff) Flow Control with automatic half-duplex transceiver control feature Multidrop mode further simplifies typical multidrop RS-485 Auto RS-485 Half-Duplex Control applications. Half-Duplex mode The Vendor ID, Product ID, bus-powered mode, self- Selectable GPIO or Modem I/O powered mode, remote wakeup support or maximum power consumption values, as well as default baud Internal 48 MHz clock with clock divisors rate settings can be programmed using the on-board programmable down to 6 MHz OTP through the USBD+ / USBD- pins. Single 5V power supply The XR21B1411 operates from a single 5V power 5V tolerant inputs supply and is available in a 16-pin QFN package. 16-pin QFN package WHQL certified software drivers for Windows XP, Vista, 7, 8, 8.1, 10 and CE, as well as Linux and Mac Virtual COM Port WHQL/HCK Windows certified are supported for the XR21B1411. drivers Windows XP, Vista, 7, 8, 8.1 and 10 APPLICATIONS Windows CE 5.0, 6.0, 7.0 Portable Appliances Linux, Mac drivers External Converters (dongles) Battery-Operated Devices Cellular Data Devices Factory Automation and Process Controls Industrial applications 1XR21B1411 ENHANCED 1-CH FULL-SPEED USB UART REV. 1.2.2 FIGURE 1. XR21B1411 BLOCK DIAGRAM 1.6V-3.6V VIO REF Internal Fractional 128-byte Programmable TX BRG TX FIFO Oscillator (6MHz 48MHz) 384-byte RX RX FIFO USBD+ USB Slave Interface Internal USBD- GPIO5/RTS /RS485 Status and GPIO4/CTS Control GPIO3/DTR GPIOs/ Registers GPIO2/DSR Modem IO USB OTP GPIO1/CD Descriptors GPIO0/RI 5V VCC UART GND FIGURE 2. PIN OUT DIAGRAM 16 15 14 13 LOWPOWER 1 12 VIO REF NC 2 16-Pin 11 VBUS SENSE QFN GPIO5/RTS /RS485 3 10 RX GPIO4/CTS 4 9 TX 567 8 (1) ORDERING INFORMATION PART NUMBER OPERATING TEMPERATURE RANGE LEAD-FREE PACKAGE PACKAGING METHOD XR21B1411IL16-F -40C to +85C 16-pin QFN Tray (2) XR21B1411IL16TR-F -40C to +85C 16-pin QFN Tape and Reel Yes XR21B1411IL16MTR-F -40C to +85C 16-pin QFN Mini Tape and Reel XR21B1411IL-0A-EB XR21B1411 Evaluation Board NOTE: 1. Refer to www.exar.com/XR21B1411 for most up-to-date Ordering Information. 2. Visit www.exar.com for additional information on Environmental Rating. 2 GPIO3/DTR VCC GPIO2/DSR USBD+ GPIO1/CD USBD- GPIO0/RI /RWK GND