USB UART LDL
July 2009
Rakesh Bhatia
Sr. Manager, Strategic Marketing
Interface Product Line
Markets and Applications
MFP
HDTV
BRE
Communications
Set Top Box
Industrial/POS
Consumer
Wireless
Transceiver
Console Servers
KVM Switches
PC104/104+
Tablets
GPS/Telematics
PCI
Network Routers
cPCI Servers
ISA
Embedded Systems
Blade Servers
Servers
MB
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USB UART
XR21V1410IL16-F – single channel USB UART
Industry smallest package, QFN-16
XR21V1412IL32-F – two channel USB UART
Industry smallest package, QFN-32
XR21V1414IM48-F – four channel USB UART
Industry smallest package, TQFP48
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USB Basics
What is USB?
USB is a serial bus standard that allows devices to connect to a host
computer
Data rates : Low Speed-1.5 Mbps, Full Speed(FS)-12 Mbps, High
Speed (HS)- 480 Mbps
Connection (4 Wires)
Vbus - nominally 5V
GND
D+
DA simple, cost effective way to add UARTs to a system
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Target CPUs with USB Interface
Most new microcontrollers
Atmel, Microchip, Freescale low end microcontroller have USB ports
and few or no UART ports
Almost all microprocessors released in the last five years
Hitachi-Renesas SH series
Motorola-Freescale Coldfire series
IDT RC series
Most Intel CPUs
Most IBM CPUs
Also target FPGAs & custom ASICs with USB/UART ports
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Products using processors with USB
Cell phones (especially PDA & pocket PC type)
DVD player, DVR, set-top boxes
Mid to high end PC monitors
Docking stations
PMP, PVP
Health diagnostics meters
PCs, Laptops & Netbooks
Industrial POS systems and handhelds
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USB UART Block Diagram
3.3V
USB_DATA+
USB_DATASDA
SCL
UART
TX
RX
GPIOs
GPIO5/RTS#
GPIO4/CTS#
GPIO3/DTR#
GPIO2/DSR#
GPIO1/CD#
GPIO0/RI#
USB
Interface
EEPROM
Interface
48 MHz Oscillator
Exar USB UART XR21V1410
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USB UARTs – Key Features
USB 2.0 Compliant Interface
12 Mbps USB full-speed data rate
Suspend, resume and remote wakeup operations
Capability to support attributes
Smallest Package in industry
Software drivers support including source code
Enhanced Features
Data rates up to 12 Mbps on UART
Fractional Baud Rate Generator
128 byte TX FIFO, 384 byte RX FIFO
7 or 8 data bits, 1 or 2 stop bits, parity
Automatic Hardware and Software Flow Control
Multidrop modes
Selectable GPIO or Modem I/O
Internal 48 MHz clock
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Benefits
Why use a USB UART?
High performance at lower supply voltage
12Mbps (3.3V)
Overall System Cost Reduction
FBRG
No crystal needed
USB is a simpler and easier interface to design (4 wire)
Shorter Time To Market
Easier to add UARTs than to upgrade to new CPU
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Exar USB Advantage
Lowest BOM cost
Smallest packages
Complete Software support
Windows, Linux and MAC
Power Management expertise and support
USB suspend mode supported
Fractional Baud Rate Generator
Achieve desired baud rate
NO external crystal needed
Exar’s Value proposition is to deliver the lowest cost
solution with additional distinguishing features
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USB UART Target Markets
Consumer Segment
Cellular Handsets
Portable devices (GPS, PMP, PDAs, etc.)
PC/Laptop add-ons (docking stations, plug-in adapters)
Industrial Segment
Card/Barcode Reader
Gate Access
Add-on Cards
Commercial Segment
Point Of Sales Systems
Security surveillance cameras
Embedded Segment
Health diagnostics meters
Embedded computing applications
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USB UART Application Example 1
 Add additional UART port to embedded application
to communicate with serial peripherals or other systems
USB
Master
USB
Interface
UART
RS-232
TXCVR
MCU
XR21V1410
RS-232
TXCVR
UART
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Application Example 2 – Medical Equipment
Console
XCVR
UART
XCVR
UART
XCVR
UART
XCVR
UART
USB
Legacy Bedside Devices
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Application Example 3 - Industrial Controls
RS-485
USB
RS-485
Stand-alone box
with USB UART/s
(Device Server)
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Pricing and Availability
List pricing (1Ku)
V1410
V1412
V1414
$1.80
$3.07
$5.80
Samples, Evaluation boards and drivers
Now
Production
August 2009
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Summary
 USB 2.0 Compliant Interface
 Enhanced Features
 Smallest packages in the industry
 UART data rates up to 12 Mbps
 Innovative driver that allows maximum flexibility
6 GPIOs that can be programmed as flow control signals
 Software drivers support – free source code
 Industry’s Largest Portfolio of UART Products
&
We will be very cost competitive and
do not want to lose on price
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