LTC4331 Datasheet

• Up to 1MHz Serial Clock, Fast-mode Plus (Fm+)
• Selectable Link Baud Rates Extend I²C Up to 1200m
• Protected from Overvoltage Line Faults to ±60V
• ±40kV ESD on Link Pins
• IEC Level 4 ESD ±8kV and EFT ±5kV on Link Pins
• Extended Common Mode Range: ±15V
• Remote Interrupt/SMBALERT and Control Signals
• Low EMI Mode
• SMBus 3.0 Compatible
• I²C Idle Detection, and Stuck Bus Protection
• I²C Device Address Sharing
• 3V to 5.5V Supply Voltage
• 1.62V to 5.5V Logic Supply
• 4mm × 5mm 20-Lead QFN package

• Industrial Control and Sensors
• Lighting and Sound System Control

The LTC4331 is a point-to-point SMBus compatible I²C slave device extender designed for operation in high noise industrial environments. Using a ±60V fault protected differential transceiver, the LTC4331 can extend an I²C/SMBus bus, including SMBALERT and a control signal, over a single twisted pair differential link up to 1200m. With an extended common mode operating range the solution provides tolerance to large ground differences between nodes. For EMI sensitive environments, a slew rate control pin reduces the EMI emitted from the differential link.

In addition, the LTC4331 can act as an I²C to I²C bridge allowing independent bus frequencies between the local and remote networks. The solution is completely transparent to the master requiring no additional code in most cases; however, a control interface is provided for additional configuration and fault monitoring.

A master controller fully supporting SCL clock-stretching is strongly recommended.