LTC4331CUFD#PBF

The LTC4331CUFD#PBF from LT is a point-to-point SMBus compatible I2C slave device extender. It is engineered for operation in high noise industrial environments, utilizing a ±60V fault protected differential transceiver. This device can extend an I2C/SMBus bus, including SMBALERT and a control signal, over a single twisted pair differential link up to 1200 meters.

With an extended common mode operating range, the LTC4331CUFD#PBF provides tolerance to large ground differences between nodes. For EMI sensitive environments, a slew rate control pin is available to reduce emitted EMI from the differential link. Additionally, it can function as an I2C to I2C bridge, allowing independent bus frequencies between local and remote networks. The solution is transparent to the master in most cases, requiring no additional code, though a control interface is provided for configuration and fault monitoring.

Key features include operation up to 1MHz serial clock (Fast-mode Plus), selectable link baud rates, ±40kV ESD on link pins, and IEC Level 4 ESD protection. It also offers ±15V extended common mode range, remote interrupt/SMBALERT and control signals, low EMI mode, SMBus 3.0 compatibility, I2C idle detection, and stuck bus protection. The device operates with a 3V to 5.5V supply voltage and a 1.62V to 5.5V logic supply. It is housed in a 4mm x 5mm 20-lead QFN package.

Applications for the LTC4331CUFD#PBF include industrial control and sensors, and lighting and sound system control.