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XR21V1412 Datasheet Preview

XR21V1412 Datasheet

2-CH FULL-SPEED USB UART

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XR21V1412
2-CH FULL-SPEED USB UART
JUNE 2018
REV. 1.3.1
GENERAL DESCRIPTION
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.
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.
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.
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.
APPLICATIONS
Portable Appliances
External Converters (dongles)
Battery-Operated Devices
Cellular Data Devices
Factory Automation and Process Controls
Industrial applications
FEATURES
USB 2.0 Compliant, Full-Speed (12 Mbps)
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
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
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
Internal 48 MHz clock
Single 3.3V power supply
5V tolerant GPIO inputs
32-pin QFN package
Virtual COM Port WHQL certified drivers
Windows XP, Vista, Win7 and Win8
Windows CE 4.2, 5.0, 6.0, 7.0
Linux
Mac
1




MaxLinear

XR21V1412 Datasheet Preview

XR21V1412 Datasheet

2-CH FULL-SPEED USB UART

No Preview Available !

XR21V1412
2-CH FULL-SPEED USB UART
FIGURE 1. XR21V1412 BLOCK DIAGRAM
3.3V VCC
GND
USBD+
USBD-
SDA
SCL
USB Slave
Interface
I2C
Interface
Internal
48MHz
Oscillator
Fractional
BRG
128-byte
TX FIFO
384-byte
RX FIFO
Internal
Status and
Control
Registers
GPIOs/
Modem IO
UART Channel A
Fractional
BRG
128-byte
TX FIFO
384-byte
RX FIFO
Internal
Status and
Control
Registers
GPIOs/
Modem IO
UART Channel B
REV. 1.3.1
TXA
RXA
GPIOA5/RTSA#/RS485A
GPIOA4/CTSA#
GPIOA3/DTRA#
GPIOA2/DSRA#
GPIOA1/CDA#
GPIOA0/RIA#
TXB
RXB
GPIOB5/RTSB#/RS485B
GPIOB4/CTSB#
GPIOB3/DTRB#
GPIOB2/DSRB#
GPIOB1/CDB#
GPIOB0/RIB#
2


Part Number XR21V1412
Description 2-CH FULL-SPEED USB UART
Maker MaxLinear
Total Page 30 Pages
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