DESCRIPTION
The LTC®4331 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.

FEATURES
- 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

APPLICATIONS
- Industrial Control and Sensors
- Lighting and Sound System Control