XR20V2172
XR20V2172 is TWO CHANNEL I2C/SPI UART manufactured by Exar.
DESCRIPTION
The XR20V21721 (V2172) is a high performance two channel universal asynchronous receiver and transmitter (UART) with 64 byte TX and RX FIFOs, a selectable I2C/SPI slave interface and RS232 transceiver. The V2172 operates from 3.3 to 5.5 volts. The enhanced features in the V2172 include a programmable fractional baud rate generator, an 8X and 4X sampling rate that allows for a maximum baud rate of 1 Mbps 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 plete modem interface. Onboard registers provide the user with operational status and data error flags. An internal loopback capability allows system diagnostics. The V2172 is available in the 64-pin QFN.
NOTE: 1 Covered by U.S. Patent #5,649,122
FEATURES
- Selectable I2C/SPI Interface
- Meets true EIA/TIA-232-F Standards from +3.3V to
+5.5V operation
- Data rate up to 1 Mbps
- 45us sleep mode exit (charge pump to full power)
- ESD protection for RS-232 I/O pins at
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- +/-15k V
- Human Body Model +/-15k V
- IEC 1000-4-2, Air-Gap Discharge +/- 8k V
- IEC 1000-4-2, Contact Discharge 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
- Full-featured UART
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- -
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- APPLICATIONS
- Portable Appliances
- Battery-Operated Devices
- Cellular Data Devices
- Factory Automation and Process Controls
FIGURE 1. XR20V2172 BLOCK DIAGRAM
XTAL1 XTAL2
- 64-QFN packages
R_EN
FAST
C2+
C1+
C2-
C1-
VR EF+ IR Q # RESET# C rys ta l O sc /B u ffe r BRG TXA RXA RTSA# DTRA# CTSA# DSRA# R IA # CDA# C hannel A CDB# R IB # DSRB# CTSB# D TR B# RTSB# TXB RXB
5K
C h a rg e P u m p VR EFTXDA RXDA RTSA DTRA CTSA DSRA R IA CDA CDB R IB DSRB CTSB DTRB RTSB...
