XR21B1424IV64TR-F

XR21B1424 Enhanced 4-Ch Full-Speed USB UART General Description FEATURES The XR21B1424 is an enhanced Universal Asynchronous Receiver and Transmitter (UART) bridge to USB interface. The USB interface is fully compliant to the USB 2.0 (Full-Speed) specification with 12 Mbps USB data transfer rate. The USB interface also supports USB suspend, resume and remote wakeup operations. The USB Vendor ID, Product ID, power mode, remote wakeup support, maximum power, and numerous other settings may be programmed in the on-chip OTP memory via the USB interface. • ±15kV ESD on USBD+/USBD• USB 2.0 Compliant, Full-Speed (12Mbps) • Unique pre-programmed USB serial number • Internally generated 48MHz core clock • Enhanced UART features • Baud rates from 300 bps to 12 Mbps • Fractional Baud Rate Generator • 512-byte TX and 512-byte RX FIFOs • Auto Hardware / Software Flow Control • Multidrop and Half-Duplex Modes • Auto RS-485 Half-Duplex Control • Selectable GPIO or Modem I/O • Up to 10 GPIOs per channel • 5V tolerant GPIO inputs • Suspend state GPIO configuration • Configurable clock output • 64-pin LQFP package The XR21B1424 includes an internal oscillator and does not require an external crystal/oscillator. Any UART baud rate from 300 bps to 12 Mbps may be generated with this internal clock and the fractional baud rate generator. The UART pins for each port may also be configured as GPIO; direction, state, output driver type and input pull-up or pull-down resistors are programmed either through on chip OTP, or on the fly via memory mapped registers. Large 512-byte TX and RX FIFOs prevent buffer overflow errors and optimize data throughput. Automatic half-duplex direction control and optional multi drop (9-bit) mode simplify both hardware and software in half-duplex RS-485 applications. Wide mode allows for each individual received character to be monitored for errors. The XR21B1424 uses the native OS CDC-ACM driver or a MaxLinear supplied custom driver. MaxLinear provides WHQL/HCK-certified software drivers for Windows 2000, 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. The XR21B1424 operates from a single 5V or 3.3V power supply. When powered with 5V input, a regulated 3.3V output is supplied. • Industrial -40°C to +85°C Temperature Range APPLICATIONS • Building Automation • Security Systems • Factory and Process Control • ATM Terminals • USB to Serial Controllers Ordering Information – page 64 Typical Application XR21B1424 MCU USB 0D[/LQHDU UART   'DWD 1 / 66   ESV exar.com/XR21B1424 Rev 1E XR21B1424 Absolute Maximum Ratings Operating Conditions Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any Maximum Rating may affect device reliability and lifetime. Operating Temperature Range.....................-40°C to +85°C Supply Voltage (VCC_REG)......................................+5.75V Supply Voltage (VCC, VIO)............................................+4V Input Voltage (VBUS_SENSE).......................-0.3 to +5.75V Input Voltage (All other pins)............................-0.3 to +5.6V Junction Temperature.................................................125°C Electrical Characteristics Unless otherwise noted: TA = -40°C to +85°C, VCC_REG = +4.4V to +5.25V or +3.0V to +3.6V, VIO = +1.8V to +3.6V. Symbol Parameter Conditions Min Typ Max Units 15 23 mA 0.85 1.25 mA 3.3 3.6 V Power ICC Power Supply Current ISUSP Lowpower Mode Current VOUT Regulated Output Voltage (VCC pin) VCC_REG = +4.4V to +5.25V VCC_REG = +4.4V to +5.25V. Maximum output current = 200 mA including the supply current of the XR21B1424. 3 UART, USB_STAT and GPIO Pins VIL Input Low Voltage -0.3 0.25* VIO V VIH Input High Voltage 0.70* VIO 5.5 V VOL Output Low Voltage IOL = 1mA, VIO = +1.6V 0.3 V IOL = 4mA, VIO = +3.6V 0.5 V VOH Output High Voltage IOH = -400uA, VIO = +1.6V 1.3 VIO V IOH = -1.5mA, VIO = +3.6V 2.8 VIO V IIL Input Low Leakage Current VIO = +3V to +3.6V, VCC_REG = +4.4V to +5.25V, VINPUT = 0V ±10 µA IIH Input High Leakage Current VIO = +3V to +3.6V, VCC_REG = +4.4V to +5.25V, VINPUT = +3.3V ±10 µA VIO = +3V to +3.6V, VCC_REG = +4.4V to +5.25V, VINPUT = +5.5V ±120 µA 5 pF CIN Input Pin Capacitance 2 / 66 exar.com/XR21B1424 Rev 1E XR21B1424 Symbol Parameter Conditions Min Typ Max Units USB I/O Pins VIL Input Low Voltage -0.3 0.8 V VIH Input High Voltage 2.0 5.5 V VOL Output Low Voltage External 15kΩ to GND on USBD+ and USBD- pins 0 0.3 V VOH Output High Voltage External 15kΩ to GND on USBD+ and USBD- pins 2.8 3.6 V VDrvZ Driver Output Impedance 28 44 Ω 3 / 66 exar.com/XR21B1424 Rev 1E XR21B1424 GPIOD6/CLKD GPIOD7/RS485D GPIOD8/TXTD 50 49 TXD 52 51 GPIOD5/RTSD#/RS485D RXD 53 GPIOD4/CTSD# 55 54 GPIOD2/DSRD# GPIOD3/DTRD# 56 GPIOD1/CDD# 57 GPIOD0/RID#/RWKD# 59 GPIOA8/TXTA GPIOA9/RXTA 60 58 GPIOA7/RS485A 62 61 TXA 64 63 GPIOA6/CLKA Pin Configuration RXA 1 48 GPIOD9/RXTD GPIOA5/RTSA#/RS485A 2 47 GPIOB0/RIB#/RWKB# GPIOA4/CTSA# 3 46 GPIOB1/CDB# GPIOA3/DTRA# 4 45 GPIOB2/DSRB# GPIOA2/DSRA# 5 44 GPIOB3/DTRB# GPIOA1/CDA# 6 43 GPIOB4/CTSB# GPIOA0/RIA#/RWKA# 7 42 GPIOB5/RTSB#/RS485B MaxLinear XR21B1424 29 30 31 32 GPIOC3/DTRC# GPIOC1/CDC# TEST# GPIOC0/RIC#/RWKC# GPIOC2/DSRC# GPIOB9/RXTB 33 28 34 16 GPIOC4/CTSC# 15 27 NC VBUS_SENSE 26 GPIOB8/TXTB RXC 35 GPIOC5/RTSC#/RS485C 14 25 NC USB_STAT1 GPIOB7/RS485B 24 36 TXC 13 23 GPIOB6/CLKB# VCC_REG 22 37 GPIOC6/CLKC 12 GPIOC7/RS485C VIO VCC 21 38 NC 11 19 GND VIO 20 39 GPIOC8/TXTC 10 GPIOC9/RXTC TXB USBD- 17 RXB 40 18 41 9 RESET# 8 USB_STAT2 GND USBD+ Top View 4 / 66 exar.com/XR21B1424 Rev 1E XR21B1424 Pin Assignments Pin No. Pin Name Type I Description 1 RXA 2 GPIOA5/RTSA#/RS485A I/O General purpose I/O, or UART Request-to-Send output (active low), or auto RS-485 halfduplex control. Defaults to GPIO input with internal pull-up resistor. See “Automatic RTS/CTS Hardware Flow Control” on page 16 or “Multidrop mode with address matching” on page 18. 3 GPIOA4/CTSA# I/O General purpose I/O, or UART Clear-to-Send input (active low). Defaults to GPIO input with internal pull-up resistor. See “Automatic RTS/CTS Hardware Flow Control” on page 16. 4 GPIOA3/DTRA# I/O General purpose I/O, or UART Data-Terminal-Ready push-pull output (active low). Defaults to GPIO input with internal pull-up resistor. See “Automatic DTR/DSR Hardware Flow Control” on page 17. 5 GPIOA2/DSRA# I/O General purpose I/O, or UART Data-Set-Ready input (active low). Defaults to GPIO input with internal pull-up resistor. See “Automatic DTR/DSR Hardware Flow Control” on page 17. 6 GPIOA1/CDA# I/O General purpose I/O, or UART Carrier-Detect input (active low). Defaults to GPIO input with internal pull-up resistor. 7 GPIOA0/RIA#/RWKA# I/O General purpose I/O, or UART Ring-Indicator input (active low), or Remote Wakeup input. Defaults to GPIO input with internal pull-up resistor. Wakeup signaling to the USB host is sent when a falling edge is detected. See “Remote Wakeup” on page 10. 8 GND 9 USBD+ I/O USB port differential data positive. This pin has internal pull-up resistor compliant to the USB 2.0 specification. The ESD protection on this pin is ±15kV HBM. 10 USBD- I/O USB port differential data negative. The ESD protection on this pin is ±15kV HBM. 11 VIO PWR I/O voltage input to the UART/GPIO pins. Must be between 1.8 and 3.6V. May be connected to VCC (pin 12) if VCC_REG input voltage is 5V. See “USB Power Modes” on page 12. 12 VCC PWR 3.3V power to the device, or 3.3V power output from the device when 5V power is supplied to VCC_REG pin. 3.3V output power can source up to 200 mA maximum (including the device) and should be decoupled by minimum of 4.7µF ceramic capacitor. See “USB Power Modes” on page 12. 13 VCC_REG PWR 5V or 3.3V power to the device. In bus-powered mode, connect VBUS power from the USB host to this pin and to the VBUS_SENSE pin - see Figure 1. To conform to USB specifications, an inrush current limiting circuit is recommended. In self-powered mode, connect on-board 5V or 3.3V source to this pin and VBUS from the USB host to the VBUS_SENSE pin. See Figure 2 and Figure 3. USB specification requires a minimum of 1uF and a maximum of 10uF of decoupling on VBUS power. 14 NC - No Connect. 15 NC - No Connect. 16 VBUS_SENSE I Must be connected to VBUS power from the USB host PC. This pin is used to disable the internal pull-up resistor on the USBD+ signal when VBUS is not present. In bus-powered mode, connect VBUS (5V) power from the USB host to this pin and to the VCC_REG pin - see Figure 1. In self-powered mode, connect VBUS from the USB host to this pin. This pin must be decoupled by a 4.7 uF tantalum capacitor. 17 RESET# I/O / OD Active low open drain output. Asserted at power on or any time device is reset by either register or USB bus reset. As an input, must be asserted for at least 15µs to force a device reset. Reset pulse width input of shorter than 15µs will have unknown effects. A weak internal pull-up resistor provides noise immunity if left unconnected. PWR UART Receive Data. Power supply common, ground. 5 / 66 exar.com/XR21B1424 Rev 1E XR21B1424 Pin No. Pin Name Type Description O / OD This pin has the same functionality as the USB_STAT1 pin. However, the default output for this pin is active low polarity, asserted whenever the XR21B1424 is placed into a suspended state. This default may be changed via the PIN_CFG_USB_STAT2 register. 18 USB_STAT2 19 GPIOC9/RXTC I/O General purpose I/O, or UART receive data indicator. Defaults to GPIO input with internal pullup resistor. See “TXT and RXT Pins” on page 19. When configured as receive indicator, this pin will toggle at ~10Hz intervals while the UART is receiving data. 20 GPIOC8/TXTC I/O General purpose I/O, or UART transmit data indicator. Defaults to GPIO input with internal pullup resistor. See “TXT and RXT Pins” on page 19. When configured as transmit indicator, this pin will toggle at ~10Hz intervals while the UART is transmitting data. 21 NC 22 GPIOC7/RS485C I/O General purpose I/O, or RS-485 half-duplex enable output. Defaults to GPIO input with internal pull-up resistor. 23 GPIOC6/CLKC I/O General purpose I/O, or clock or pulse output. Defaults to GPIO input with internal pull-up resistor. See “Programmable Output Clock” on page 16. 24 TXC O UART Transmit Data. 25 USB_STAT1 O The USB_STAT1 output pin may be used to indicate any of three USB status conditions: 1. USB_STAT1 is asserted when the USB host asserts USB reset. 2. USB_STAT1 is asserted when the USB host PC places the XR21B1424 device into the suspended state. 3. USB_STAT1 is asserted when it is not safe to draw the amount of current requested in the Device Maximum Power field of the Configuration Descriptor. a. For a low power device (