XR18W750 WIRELESS UART CONTROLLER MARCH 2008 REV. 1.0.0 FEATURES GENERAL DESCRIPTION 2.25 to 3.63 Volt Operation The XR18W750 is a Wireless UART Controller with a 2 5 Volt Tolerant Inputs two-wire IC interface to the XR18W753 RF transceiver to complete Exars Wireless UART 8051 Microcontroller chipset solution. The XR18W750 supports both the 32KB System Memory parallel and serial interfaces to any host system thus 128-bit AES Engine providing flexibility for system designers to select their interface option. 2 I C Bus Master Interface to RF Transceivers The XR18W750 includes an embedded 8051 Optional UART interface to RF Transceiver microprocessor which provides the power to process Selectable Serial or Parallel Mode Interface the protocol framing for data transmission and to handle error processing. Internally, the XR18W750 Enhanced UART has a 32KB system memory for loading the firmware 16550 Compatible Register Set from an external EEPROM and for data processing. Parallel mode data rate from 1200 bps to 230.4 The XR18W750 also includes a 128-bit AES engine Kbps for data encoding and decoding. Serial mode data rate from 1200 bps to The XR18W750 is available in a 48-pin QFN 921.6Kbps package. Transmit and Receive FIFOs of 64 bytes APPLICATIONS Programmable TX and RX FIFO Trigger Levels Transmit and Receive FIFO Level Counters Industrial Automation Automatic Hardware (RTS/CTS) Flow Control Factory Automation Selectable Auto RTS Flow Control Hysteresis Point of Sales Systems Full modem interface Industrial Servers Device Identification and Revision Data Collection Terminals 48-pin QFN package FIGURE 1. XR18W750 BLOCK DIAGRAM A2:A0 AES Parallel D7:D0 Encoding/ Mode 16/68 , CS , IOW , IOR Decoding INT, TXRDY , RXRDY GPIO 3:0 32KB System CLK+ Memory CLK- Serial UART Mode SDA 2 TX, RX, RTS , CTS , 8051 I C Interface SCL DTR , DSR , CD , RI Microprocessor MODEM RESET RF IRQ RF DI RF DO S/P EN DIDO RESET Exar Corporation 48720 Kato Road, Fremont CA, 94538 (510) 668-7000 FAX (510) 668-7017 www.exar.com XR18W750 WIRELESS UART CONTROLLER REV. 1.0.0 FIGURE 2. PIN OUT ASSIGNMENT MODEM RESET 1 36 EN DIDO GND 2 35 TXRDY CLK- 3 34 D7 CLK+ 4 33 D6 VCC 5 32 D5 TEST2 6 31 D4 XR18W750 TEST1 7 30 D3 RF IRQ 8 29 D2 RF DO 9 28 D1 RF DI 10 27 D0 SDA 11 26 IOR SCL 12 25 VCC ORDERING INFORMATION PART NUMBER PACKAGE OPERATING TEMPERATURE RANGE DEVICE STATUS XR18W750IL48 48-Lead QFN -40C to +85C Active 2 GPIO0 48 13 GPIO3 INT 14 47 GPIO2 46 S/P 15 GPIO1 RESET 16 45 TEST0 44 TX 17 16/68 RX 18 43 IOW 42 DSR 19 CS RTS 20 41 RXRDY 40 RI 21 A0 CTS 22 39 A1 38 DTR 23 A2 CD 24 37 GND