XR21V1412IL-0A-EB

XR21V1412 2-CH FULL-SPEED USB UART JUNE 2018 REV. 1.3.1 GENERAL DESCRIPTION FEATURES  USB 2.0 Compliant, Full-Speed (12 Mbps) The XR21V1412 is an enhanced 2-channel 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. ■ Supports USB suspend, resume and remote wakeup operations ■ ± 5 kV HBM ESD protection on USB data pins ■ ± 2 kV HBM ESD protection on all other pins  Enhanced Features of each UART The XR21V1412 operates from an internal 48MHz clock therefore no external crystal/oscillator is required as in previous generation UARTs. With the fractional baud rate generator, any baud rate can accurately be generated using the internal 48MHz clock. ■ UART data rates up to 12 Mbps ■ Fractional Baud Rate Generator ■ 128 byte TX FIFO ■ 384 byte RX FIFO ■ 7, 8 or 9 data bits The large 128-byte TX FIFO and 384-byte RX FIFO of the XR21V1412 helps to optimize the overall data throughput for various applications. If required, the multidrop mode and automatic RS-485 half-duplex direction control feature further simplifies typical multidrop RS-485 applications. ■ 1 or 2 stop bits ■ Odd, even, mark, space or no parity ■ Automatic Hardware (RTS/CTS or DTR/DSR) Flow Control ■ Automatic Software (Xon/Xoff) Flow Control ■ Multidrop mode ■ Auto RS-485 Half-Duplex Control ■ Half-Duplex mode ■ Selectable GPIO or Modem I/O The XR21V1412 operates from a single 2.97 to 3.63 volt power supply and has 5V tolerant inputs. The XR21V1412 is available in a 32-pin QFN package. The XR21V1412 uses the native OS CDC-ACM driver or a MaxLinear supplied custom driver. MaxLinear provides WHQL/HCK-certified software drivers for Windows XP, Vista, 7, 8, 8.1 and 10 as well as software drivers for Windows CE, Linux and Mac OS X. Full source code is available.  Internal 48 MHz clock  Single 3.3V power supply  5V tolerant GPIO inputs  32-pin QFN package  Virtual COM Port WHQL certified drivers APPLICATIONS  Portable Appliances  External Converters (dongles)  Battery-Operated Devices  Cellular Data Devices  Factory Automation and Process Controls  Industrial applications 1 ■ Windows XP, Vista, Win7 and Win8 ■ Windows CE 4.2, 5.0, 6.0, 7.0 ■ Linux ■ Mac XR21V1412 2-CH FULL-SPEED USB UART REV. 1.3.1 FIGURE 1. XR21V1412 BLOCK DIAGRAM 3.3V VCC GND Fractional BRG USBD+ USBD- Internal Status and Control Registers USB Slave Interface 128-byte TX FIFO TXA 384-byte RX FIFO RXA GPIOs/ Modem IO GPIOA5/RTSA#/RS485A GPIOA4/CTSA# GPIOA3/DTRA# GPIOA2/DSRA# GPIOA1/CDA# GPIOA0/RIA# UART Channel A SDA SCL I2C Interface Internal 48MHz Oscillator Fractional BRG Internal Status and Control Registers 128-byte TX FIFO TXB 384-byte RX FIFO RXB GPIOs/ Modem IO UART Channel B 2 GPIOB5/RTSB#/RS485B GPIOB4/CTSB# GPIOB3/DTRB# GPIOB2/DSRB# GPIOB1/CDB# GPIOB0/RIB# XR21V1412 2-CH FULL-SPEED USB UART REV. 1.3.1 VCC VCC USBD+ USBDGND GND SCL SDA FIGURE 2. PIN OUT ASSIGNMENT 32 31 30 29 28 27 26 25 GND LOWPOWER GND VCC TXA RXA GPIOA5/RTSA#/RS485A GPIOA4/CTSA# 1 2 3 4 5 6 7 8 24 23 22 21 20 19 18 17 32-pin QFN VCC GND GPIOB0/RIB#/RWKB# GPIOB1/CDB# GPIOB2/DSRB# GPIOB3/DTRB# GPIOB4/CTSB# GPIOB5/RTSB#/RS485B GPIOA3/DTRA# GPIOA2/DSRA# GPIOA1/CDA# GPIOA0/RIA#/RWKA# VCC GND TXB RXB 9 10 11 12 13 14 15 16 ORDERING INFORMATION(1) PART NUMBER XR21V1412IL32-F XR21V1412IL32TR-F OPERATING TEMPERATURE RANGE LEAD-FREE PACKAGE -40°C to +85°C Yes(2) 32-pin QFN PACKAGING METHOD Tray Tape and Reel XR21V1412IL-0A-EB XR21V1412 Evaluation Board - RS-232 and RS-485 capable XR21V1412IL-0B-EB XR21V1412 Evaluation Board - RS-232 capable NOTES: 1. Refer to www.exar.com/XR21V1412 for most up-to-date Ordering Information. 2. Visit www.exar.com for additional information on Environmental Rating. 3 XR21V1412 2-CH FULL-SPEED USB UART REV. 1.3.1 PIN DESCRIPTIONS NAME 32-QFN TYPE PIN # DESCRIPTION UART Channel A Signals RXA 6 I UART Channel A Receive Data. This pin has an internal pull-up resistor. Internal pullup resistor is not disabled during suspend mode. TXA 5 O UART Channel A Transmit Data. GPIOA0/RIA#/ RWKA# 12 I/O UART Channel A general purpose I/O or UART Ring-Indicator input (active low) or Remote Wakeup Input (See ”Section 1.5.13, Remote Wakeup” on page 13.). This pin has an internal pull-up resistor which is disabled during suspend mode. If using this GPIO as an input, an external pull-up resistor is required to minimize the power  consumption in the suspend mode. GPIOA1/CDA# 11 I/O UART Channel A general purpose I/O or UART Carrier-Detect input (active low). This pin has an internal pull-up resistor which is disabled during suspend mode. If using this GPIO as an input, an external pull-up resistor is required to minimize the power consumption in the suspend mode. GPIOA2/DSRA# 10 I/O UART Channel A general purpose I/O or UART Data-Set-Ready input (active low). See ”Section 1.5.6, Automatic DTR/DSR Hardware Flow Control” on page 12. This pin has an internal pull-up resistor which is disabled during suspend mode. If using this GPIO as an input, an external pull-up resistor is required to minimize the power consumption in the suspend mode. GPIOA3/DTRA# 9 I/O UART Channel A general purpose I/O or UART Data-Terminal-Ready output (active low). See ”Section 1.5.6, Automatic DTR/DSR Hardware Flow Control” on page 12. This pin has an internal pull-up resistor which is disabled during suspend mode. If using this GPIO as an input, an external pull-up resistor is required to minimize the power consumption in the suspend mode. GPIOA4/CTSA# 8 I/O UART Channel A general purpose I/O or UART Clear-to-Send input (active low). See ”Section 1.5.5, Automatic RTS/CTS Hardware Flow Control” on page 11. This pin has an internal pull-up resistor which is disabled during suspend mode. If using this GPIO as an input, an external pull-up resistor is required to minimize the power consumption in the suspend mode. GPIOA5/RTSA#/ RS485A 7 I/O UART Channel A general purpose I/O or UART Request-to-Send output (active low) or auto RS-485 half-duplex control. See ”Section 1.5.5, Automatic RTS/CTS Hardware Flow Control” on page 11. This pin has an internal pull-up resistor which is  disabled during suspend mode. If using this GPIO as an input, an external pull-up resistor is required to minimize the power consumption in the suspend mode. UART Channel B Signals RXB 16 I UART Channel B Receive Data. This pin has an internal pull-up resistor. Internal pullup resistor is not disabled during suspend mode. TXB 15 O UART Channel B Transmit Data. GPIOB0/RIB#/ RWKB# 22 I/O UART Channel B general purpose I/O or UART Ring-Indicator input (active low) or Remote Wakeup Input (See ”Section 1.5.13, Remote Wakeup” on page 13.). This pin has an internal pull-up resistor which is disabled during suspend mode. If using this GPIO as an input, an external pull-up resistor is required to minimize the power  consumption in the suspend mode. GPIOB1/CDB# 21 I/O UART Channel B general purpose I/O or UART Carrier-Detect input (active low). This pin has an internal pull-up resistor which is disabled during suspend mode. If using this GPIO as an input, an external pull-up resistor is required to minimize the power consumption in the suspend mode. 4 XR21V1412 2-CH FULL-SPEED USB UART REV. 1.3.1 NAME 32-QFN TYPE PIN # DESCRIPTION GPIOB2/DSRB# 20 I/O UART Channel B general purpose I/O or UART Data-Set-Ready input (active low). See ”Section 1.5.6, Automatic DTR/DSR Hardware Flow Control” on page 12. This pin has an internal pull-up resistor which is disabled during suspend mode. If using this GPIO as an input, an external pull-up resistor is required to minimize the power consumption in the suspend mode. GPIOB3/DTRB# 19 I/O UART Channel B general purpose I/O or UART Data-Terminal-Ready output (active low). See ”Section 1.5.6, Automatic DTR/DSR Hardware Flow Control” on page 12. This pin has an internal pull-up resistor which is disabled during suspend mode. If using this GPIO as an input, an external pull-up resistor is required to minimize the power consumption in the suspend mode. GPIOB4/CTSB# 18 I/O UART Channel B general purpose I/O or UART Clear-to-Send input (active low). See ”Section 1.5.5, Automatic RTS/CTS Hardware Flow Control” on page 11. This pin has an internal pull-up resistor which is disabled during suspend mode. If using this GPIO as an input, an external pull-up resistor is required to minimize the power consumption in the suspend mode. GPIOB5/RTSB#/ RS485B 17 I/O UART Channel B general purpose I/O or UART Request-to-Send output (active low) or auto RS-485 half-duplex control. See “Section 1.5.5, Automatic RTS/CTS Hardware Flow Control” on page 11 or “Section 1.5.8, Auto RS-485 Half-Duplex Control” on page 12. This pin has an internal pull-up resistor which is disabled during  suspend mode. If using this GPIO as an input, an external pull-up resistor is required to minimize the power consumption in the suspend mode. USB Interface Signals USBD+ 30 I/O USB port differential data plus. This pin has a 1.5 K Ohm internal pull-up resistor. USBD- 29 I/O USB port differential data minus. I2C Interface Signals SDA 25 I/O OD I2C-controller data input/output (open-drain). An optional external I2C EEPROM can be used to store default configurations upon power-up including the USB Vendor ID and Device ID. See Table 3. A pull-up resisitor (typically 4.7 to 10k Ohms) is required. If an EEPROM is not used, this pin can be used with the SCL pin to select the Remote Wake-up and Power modes. An external pull-up or pull-down resistor is required. See Table 2. SCL 26 I/O OD I2C-controller serial input clock. An optional external I2C EEPROM can be used to store default configurations upon power-up including the USB Vendor ID and Device ID. See Table 3. A pull-up resisitor (typically 4.7 to 10k Ohms) is required. If an EEPROM is not used, this pin can be used with the SDA pin to select the Remote Wake-up and Power modes. An external pull-up or pull-down resistor is required. See Table 2. 5 XR21V1412 2-CH FULL-SPEED USB UART NAME REV. 1.3.1 32-QFN TYPE PIN # DESCRIPTION Miscellaneous Signals LOWPOWER 2 O Low power status output. The LOWPOWER pin will be asserted whenever it is not safe to draw the amount of current from VBUS power requested in the Device Max Power field of the Configuration Descriptor. The LOWPOWER pin will behave  differently for a low power device and a high power device. Low-power device (