XR20V2170 Datasheet, PDF (1/52 Pages) Exar Corporation – I2C/SPI UART WITH 64-BYTE FIFO AND RS232 TRANSCEIVER

XR20V2170
I2C/SPI UART WITH 64-BYTE FIFO AND RS232 TRANSCEIVER
JUNE 2007
REV. 1.0.0
GENERAL DESCRIPTION
The XR20V2170¹ (V2170) is a high performance
universal asynchronous receiver and transmitter
(UART) with 64 byte TX and RX FIFOs, a selectable
I²C/SPI slave interface and RS232 transceiver. The
V2170 operates from 2.97 to 3.63 volts. The
enhanced features in the V2170 include a
programmable fractional baud rate generator, an 8X
and 4X sampling rate that allows for a maximum baud
rate of 250 Kbps at 3.3V. The standard features
include 16 selectable TX and RX FIFO trigger levels,
automatic hardware (RTS/CTS) and software (Xon/
Xoff) flow control, and a complete modem interface.
Onboard registers provide the user with operational
status and data error flags. An internal loopback
capability allows system diagnostics. The V2170 is
available in the 40-pin QFN.
NOTE: 1 Covered by U.S. Patent #5,649,122
APPLICATIONS
• Portable Appliances
• Battery-Operated Devices
• Cellular Data Devices
• Factory Automation and Process Controls
FEATURES
• Selectable I²C/SPI Interface
• Meets true EIA/TIA-232-F Standards from +2.97V
to +3.63V operation
• Data rate up to 250 Kbps
• 45us sleep mode exit (charge pump to full power)
• ESD protection for RS-232 I/O pins at
■ +/-15kV - Human Body Model
■ +/-15kV - IEC 61000-4-2, Air-Gap Discharge
■ +/- 8kV - IEC 61000-4-2, Contact Discharge
• Full-featured UART
■ Fractional Baud Rate Generator
■ Transmit and Receive FIFOs of 64 bytes
■ 16 Selectable TX and RX FIFO Trigger Levels
■ Automatic Hardware (RTS/CTS) Flow Control
■ Automatic Software (Xon/Xoff) Flow Control
■ Halt and Resume Transmission Control
■ Automatic sleep mode
■ General Purpose I/Os
■ Full modem interface
• 40-QFN packages
FIGURE 1. XR20V2170 BLOCK DIAGRAM
IR Q #
SDA
SCK
A 0/C S#
A 1 /S I
SO
I2C /SP I#
C rystal
O sc / Buffer
BRG
64 Byte
TX & RX
F IF O
I2 C /S P I
In te rfa c e
M odem
I/O s
G PIO s
TX
RX
RTS#
DTR #
CTS#
DSR #
RI#
CD#
UART
X R20V 2170
Charge Pum p
5K
5K
5K
5K
5K
R S -232 Transceiver
VREF+
VREF-
TXD
RXD
RTS
DTR
CTS
DSR
RI
CD
G P IO [3:0]
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • [phone] • FAX [phone] • www.exar.com