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PDF XR21V1410 Data sheet ( Hoja de datos )
| Número de pieza | XR21V1410 | |
| Descripción | 1-Ch Full-Speed USB UART | |
| Fabricantes | Exar Corporation | |
| Logotipo |  |
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XR21V1410
1-CH FULL-SPEED USB UART
www.DataShJeUeNt4EU2.c0o0m9
REV. 1.0.0
GENERAL DESCRIPTION
The XR21V1410 (V1410) 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 V1410 operates from an internal 48MHz clock
therefore no external crystal/oscillator is required like
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 FIFO and 384-byte RX FIFO of
the V1410 helps to optimize the overall data
throughput for various applications. The Automatic
Transceiver Direction control feature simplifies both
the hardware and software for half-duplex RS-485
applications. If required, the multidrop (9-bit) mode
with automatic half-duplex transceiver control feature
further simplifies typical multidrop RS-485
applications.
The V1410 operates from a single 2.97 to 3.63 volt
power supply and has 5V tolerant inputs. The V1410
is available in a 16-pin QFN package.
Software drivers for Windows 2000, XP, Vista, and
CE, as well as Linux and Mac are supported for the
XR21V1410.
APPLICATIONS
• Portable Appliances
• External Converters (dongles)
• Battery-Operated Devices
• Cellular Data Devices
• Factory Automation and Process Controls
• Industrial applications
FEATURES
• USB 2.0 Compliant Interface
■ Supports 12 Mbps USB full-speed data rate
■ Supports USB suspend, resume and remote
wakeup operations
• Enhanced UART Features
■ 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
■ Automatic Hardware (RTS/CTS or DTR/DSR)
Flow Control
■ Automatic Software (Xon/Xoff) Flow Control
■ Multidrop mode w/ Auto Half-Duplex
Transceiver Control
■ Multidrop mode w/ Auto TX Enable
■ Half-Duplex mode
■ Sleep Mode with Remote Wake-up
■ Selectable GPIO or Modem I/O
• Internal 48 MHz clock
• Single 2.97-3.63V power supply
• 5V tolerant inputs
• 16-pin QFN package
• Virtual COM Port drivers
■ Windows 2000, XP and Vista
■ Windows CE 4.2, 5.0, 6.0
■ Linux
■ Mac
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (510) 668-7000 • FAX (510) 668-7017 • www.exar.com
1 page  
XR21V1410
www.DataShReEeVt4.U1..c0o.0m
1.0 FUNCTIONAL DESCRIPTIONS
1-CH FULL-SPEED USB UART
1.1 USB interface
The USB interface of the V1410 is compliant with the USB 2.0 Full-Speed Specifications. The USB
configuration model presented by the V1410 to the device driver is compatible to the Abstract Control Model of
the USB Communication Device Class (CDC-ACM). The V1410 uses the following set of parameters:
• 1 Control Endpoint
■ Endpoint 0 as outlined in the USB specifications
• 1 Configuration is supported
• 2 interfaces for the UART channel
■ Single interrupt endpoint
■ Bulk-in and bulk-out endpoints
1.1.1 USB Vendor ID
Exar’s USB Vendor ID is 0x04E2. This is the default Vendor ID that is used for the V1410 unless a valid
EEPROM is present on the I2C interface signals. If a valid EEPROM is present, the Vendor ID from the
EEPROM will be used.
1.1.2 USB Product ID
The default USB Product ID for the V1410 is 0x1410. If a valid EEPROM is present, the Product ID from the
EEPROM will be used.
1.2 I2C Interface
The I2C interface provides connectivity to an external I2C memory device (i.e. EEPROM) that can be read by
the V1410 for configuration.
The SDA and SCL are used to specify whether Remote Wakeup and/or Bus Powered configurations are to be
supported. These pins are sampled at power-up. The following table describes how Remote Wakeup and Bus
Powered support.
TABLE 1: REMOTE WAKEUP AND POWER MODES
SDA
SCL
REMOTE WAKE-UP
SUPPORT
POWER MODE
COMMENTS
11
No
Self-Powered
Default, if no EEPROM is present
10
No Bus-Powered
01
Yes Self-Powered
00
Yes Bus-Powered
5
5 Page 
www.DataShReEeVt4.U1..c0o.0m
NAME
CDC_ACM_IF
SEND_BREAK
XR_SET_REG
XR_GETN_REG
XR21V1410
1-CH FULL-SPEED USB UART
TABLE 3: SUPPORTED USB CONTROL COMMANDS
REQUEST
TYPE
REQUEST
VALUE
INDEX
LENGTH
DESCRIPTION
0x21
35 val val 0, 2, 0 0 0 Send a break for the speci-
LSB MSB 4, 6
fied duration
0x40
0
val 0 regis- block 0
0 Exar custom command: set
ter one 8-bit register
val: 8-bit register value
register address: see
Table 6
block number: see Table 4
0xC0 1 0 0 regis- block count count Exar custom register: get
ter
LSB MSB
count 8-bit registers
register address: see
Table 6
block number: see Table 4
2.1 UART Block Numbers
The table below lists the block numbers for accessing each of the UART channels and the UART Manager..
TABLE 4: CONTROL BLOCKS
BLOCK NAME
BLOCK NUMBER
DESCRIPTION
UART
0 The configuration and control registers for UART.
Reserved
1-3 Block Numbers 1-3 are Reserved
UART Manager
4 The control registers for the UART Manager. The UART Manager
enables/disables the TX and RX FIFOs for each UART.
11
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| PDF Descargar | [ Datasheet XR21V1410.PDF ] | |
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