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XR18W750
WIRELESS UART CONTROLLER
MARCH 2008
GENERAL DESCRIPTION
The XR18W750 is a Wireless UART Controller with a
two-wire I 2 C interface to the XR18W753 RF
transceiver to complete Exar ’s Wireless UART
chipset solution. The XR18W750 supports both the
parallel and serial interfaces to any host system thus
providing flexibility for system designers to select
their interface option.
The XR18W750 includes an embedded 8051
microprocessor which provides the power to process
the protocol framing for data transmission and to
handle error processing. Internally, the XR18W750
REV. 1.0.0
FEATURES
? 2.25 to 3.63 Volt Operation
? 5 Volt Tolerant Inputs
? 8051 Microcontroller
? 32KB System Memory
? 128-bit AES Engine
? I 2 C Bus Master Interface to RF Transceivers
? Optional UART interface to RF Transceiver
? Selectable Serial or Parallel Mode Interface
? Enhanced UART
has a 32KB system memory for loading the firmware
from an external EEPROM and for data processing.
The XR18W750 also includes a 128-bit AES engine
for data encoding and decoding.
The XR18W750 is available in a 48-pin QFN
package.
APPLICATIONS
■
■
■
■
■
16550 Compatible Register Set
Parallel mode data rate from 1200 bps to 230.4
Kbps
Serial mode data rate from 1200 bps to
921.6Kbps
Transmit and Receive FIFOs of 64 bytes
Programmable TX and RX FIFO Trigger Levels
? Industrial Automation
? Factory Automation
? Point of Sales Systems
? Industrial Servers
? Data Collection Terminals
F IGURE 1. XR18W750 B LOCK D IAGRAM
■ Transmit and Receive FIFO Level Counters
■ Automatic Hardware (RTS/CTS) Flow Control
■ Selectable Auto RTS Flow Control Hysteresis
■ Full modem interface
? Device Identification and Revision
? 48-pin QFN package
A2:A0
D7:D0
16/68#, CS#, IOW#, IOR#
INT, TXRDY#, RXRDY#
Parallel
Mode
AES
Encoding/
Decoding
32KB
System
Memory
GPIO[3:0]
CLK+
CLK-
TX, RX, RTS#, CTS#,
DTR#, DSR#, CD#, RI#
Serial
Mode
UART
8051
Microprocessor
I 2 C Interface
SDA
SCL
MODEM_RESET
RF_IRQ#
RF_DI
S/P#
RESET
RF_DO
EN_DIDO
Exar Corporation 48720 Kato Road, Fremont CA, 94538 ? (510) 668-7000 ? FAX (510) 668-7017 ? www.exar.com
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