Datasheet LTC4331 (Analog Devices)

LTC4331 I2C Slave Device Extender Over Rugged Differential Link FEATURES DESCRIPTION n
Up to 1MHz Serial Clock, Fast-mode Plus (Fm+)
The LTC®4331 is a point-to-point SMBus compatible I2C n
Selectable Link Baud Rates Extend I2C Up to
slave device extender designed for operation in high noise
1200m
industrial environments. Using a ±60V fault protected n
Protected from Overvoltage Line Faults to ±60V
differential transceiver, the LTC4331 can extend an I2C/ 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- n I2C Idle Detection, and Stuck Bus Protection ferential link. n I2C Device Address Sharing In addition, the LTC4331 can act as an I2C to I2C 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
Extended I2C Network Over 30m, 1MHz Fm+ SCL
5V VL VCC 5V 3.3V VCC VL 3.3V 10k 2.7k LTC4331 4.7µF 4.7µF LTC4331 2.7k 10k 2.7k 1µF 1µF 2.7k 620Ω 620Ω MCU_SCL SCL 30m CAT5 A SCL REM_SCL A 110Ω 110Ω MCU_SDA SDA SDA REM_SDA MCU_INT ALERT B B ALERT REM_INT MCU_CTRL CTRL CTRL REM_CTRL 1.5k SLO 5V 3.3V 620Ω 620Ω SLO 620Ω 5V LINK LINK 3.3V D1 D2 REMOTE REMOTE 3.3V A1/2 SPEED1/2 SPEED1/2 V GROUND LOOP GND1 ≤15V PEAK GND2 Rev 0 Document Feedback For more information www.analog.com 1 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Switching Characteristics Typical Performance Characteristics Pin Functions Block Diagram Test Circuits Timing Diagrams Applications Information Typical Applications Package Description Typical Application Related Parts