DC2754A Analog Devices

LTC4331 2 I C Slave Device Extender Over Rugged Differential Link FEATURES DESCRIPTION 2 n Up to 1MHz Serial Clock, Fast-mode Plus (Fm+) The LTC 4331 is a point-to-point SMBus compatible I C 2 n Selectable Link Baud Rates Extend I C Up to slave device extender designed for operation in high noise 1200m industrial environments. Using a 60V fault protected 2 n Protected from Overvoltage Line Faults to 60V differential transceiver, the LTC4331 can extend an I C/ n 40kV ESD on Link Pins SMBus bus, including SMBALERT and a control signal, n IEC Level 4 ESD 8kV and EFT 5kV on Link Pins over a single twisted pair differential link up to 1200m. n Extended Common Mode Range: 15V With an extended common mode operating range the n Remote Interrupt/SMBALERT and Control Signals solution provides tolerance to large ground differences n Low EMI Mode between nodes. For EMI sensitive environments, a slew n SMBus 3.0 Compatible rate control pin reduces the EMI emitted from the dif- 2 n I C Idle Detection, and Stuck Bus Protection ferential link. 2 n I C Device Address Sharing 2 2 In addition, the LTC4331 can act as an I C to I C bridge n 3V to 5.5V Supply Voltage allowing independent bus frequencies between the local n 1.62V to 5.5V Logic Supply and remote networks. The solution is completely trans- n 4mm 5mm 20-Lead QFN package parent to the master requiring no additional code in most cases however, a control interface is provided for addi- APPLICATIONS tional configuration and fault monitoring. n Industrial Control and Sensors A master controller fully supporting SCL clock-stretching n Lighting and Sound System Control is strongly recommended. All registered trademarks and trademarks are the property of their respective owners. Patent Pending. TYPICAL APPLICATION 2 Extended I C Network Over 30m, 1MHz Fm+ SCL 5V V V 5V 3.3V V V 3.3V L CC CC L 4.7F 4.7F LTC4331 LTC4331 2.7k 10k 10k 2.7k 1F 1F 2.7k 2.7k 620 620 30m CAT5 MCU SCL SCL SCL REM SCL A A 110 110 MCU SDA SDA SDA REM SDA MCU INT ALERT B B ALERT REM INT CTRL CTRL MCU CTRL REM CTRL 1.5k 5V 3.3V 620 SLO SLO 620 620 5V LINK LINK 3.3V D2 D1 REMOTE REMOTE 3.3V A1/2 SPEED1/2 SPEED1/2 V GROUND LOOP 15V PEAK GND1 GND2 Rev 0 1 Document Feedback For more information www.analog.comLTC4331 TABLE OF CONTENTS Features ............................................................................................................................ 1 Applications ....................................................................................................................... 1 Description......................................................................................................................... 1 Typical Application ............................................................................................................... 1 Absolute Maximum Ratings ..................................................................................................... 3 Pin Configuration ................................................................................................................. 3 Order Information ................................................................................................................. 3 Electrical Characteristics ........................................................................................................ 3 Switching Characteristics ....................................................................................................... 5 Typical Performance Characteristics .......................................................................................... 7 Pin Functions ...................................................................................................................... 8 Block Diagram ..................................................................................................................... 9 Test Circuits ......................................................................................................................10 Timing Diagrams ................................................................................................................11 Applications Information .......................................................................................................12 Typical Applications .............................................................................................................24 Package Description ............................................................................................................25 Typical Application ..............................................................................................................26 Related Parts .....................................................................................................................26 Rev 0 2 For more information www.analog.com