XR20V2170 I2C/SPI UART WITH 64-BYTE FIFO AND RS232 TRANSCEIVER JUNE 2011 REV. 1.0.1 FEATURES GENERAL DESCRIPTION 2 Selectable I C/SPI Interface 1 The XR20V2170 (V2170) is a high performance universal asynchronous receiver and transmitter SPI clock frequency up to 18 MHz (UART) with 64 byte TX and RX FIFOs, a selectable Meets true EIA/TIA-232-F Standards from +2.97V 2 I C/SPI slave interface and RS232 transceiver. The to +3.63V operation V2170 operates from 2.97 to 3.63 volts. The Data rate up to 250 Kbps enhanced features in the V2170 include a programmable fractional baud rate generator, an 8X 45us sleep mode exit (charge pump to full power) and 4X sampling rate that allows for a maximum baud ESD protection for RS-232 I/O pins at rate of 250 Kbps at 3.3V. The standard features include 16 selectable TX and RX FIFO trigger levels, +/-15kV - Human Body Model automatic hardware (RTS/CTS) and software (Xon/ +/-15kV - IEC 61000-4-2, Air-Gap Discharge Xoff) flow control, and a complete modem interface. +/- 8kV - IEC 61000-4-2, Contact Discharge Onboard registers provide the user with operational status and data error flags. An internal loopback Full-featured UART capability allows system diagnostics. The V2170 is Fractional Baud Rate Generator available in the 40-pin QFN. Transmit and Receive FIFOs of 64 bytes NOTE: 1 Covered by U.S. Patent 5,649,122 16 Selectable TX and RX FIFO Trigger Levels APPLICATIONS Automatic Hardware (RTS/CTS) Flow Control Portable Appliances Automatic Software (Xon/Xoff) Flow Control Halt and Resume Transmission Control Battery-Operated Devices Automatic sleep mode Cellular Data Devices General Purpose I/Os Factory Automation and Process Controls Full modem interface 40-QFN packages FIGURE 1. XR20V2170 BLOCK DIAGRAM VREF+ Crystal C harge P um p Osc /Buffer VREF- 64 B y te TX TXD BRG TX & R X RX RXD FIFO 5K RTS RTS DTR DTR IR Q CTS CTS 5K M odem SDA DSR DSR I/O s 5K SCK RI RI 5K I2C /S P I A0/CS CD CD In te rfa ce 5K A1/SI R S -232 T ransceiver GPIOs G P IO 3:0 SO I2C/SPI UART XR20V 2170 Exar Corporation 48720 Kato Road, Fremont CA, 94538 (510) 668-7000 FAX (510) 668-7017 www.exar.com UART Registers XTAL1 XTAL2 GND VCC (2.97 3.63V) ACP C2+ C2- C1+ C1-XR20V2170 I2C/SPI UART WITH 64-BYTE FIFO AND RS232 TRANSCEIVER REV. 1.0.1 FIGURE 2. PIN OUT ASSIGNMENT 30 29 28 27 26 25 24 23 22 21 N.C. 31 20 C2+ N.C. 32 19 N.C. N.C. 33 SDA 18 VREF 34 17 GND 40-Pin QFN 35 VCC 16 GPIO3 A0/CS 36 15 ACP A1/SI XTAL2 37 14 CD 38 13 XTAL1 RI 39 12 DTR 40 11 SO RTS 1 234 56 78 9 10 ORDERING INFORMATION PART NUMBER PACKAGE OPERATING TEMPERATURE RANGE DEVICE STATUS XR20V2170IL40-F 40-pin QFN -40C to +85C Active XR20V2170IL40TR-F 40-pin QFN -40C to +85C Active NOTE: TR = Tape and Reel, F = Green / RoHS 2 C1- DSR C1+ GPIO0 RESET RXD IRQ CTS GND GPIO1 EN485 I2C/SPI ENIR GND SCK GPIO2 VREF- N.C. C2- TXD