LTC4331

1

Rev 0

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TYPICAL APPLICATION

FEATURES

DESCRIPTION

I2C Slave Device Extender

Over Rugged Differential Link

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 dif-

ferential 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 trans-

parent to the master requiring no additional code in most

cases; however, a control interface is provided for addi-

tional configuration and fault monitoring.

A master controller fully supporting SCL clock-stretching

is strongly recommended.

Extended I2C Network Over 30m, 1MHz Fm+ SCL

APPLICATIONS

n

Up to 1MHz Serial Clock, Fast-mode Plus (Fm+)

n

Selectable Link Baud Rates Extend I2C Up to

1200m

n

Protected from Overvoltage Line Faults to ±60V

n

±40kV ESD on Link Pins

n

IEC Level 4 ESD ±8kV and EFT ±5kV on Link Pins

n

Extended Common Mode Range: ±15V

n

Remote Interrupt/SMBALERT and Control Signals

n

Low EMI Mode

n

SMBus 3.0 Compatible

n

I2C Idle Detection, and Stuck Bus Protection

n

I2C Device Address Sharing

n

3V to 5.5V Supply Voltage

n

1.62V to 5.5V Logic Supply

n

4mm × 5mm 20-Lead QFN package

n

Industrial Control and Sensors

n

Lighting and Sound System Control

All registered trademarks and trademarks are the property of their respective owners. Patent

Pending.

110

110

2.7k

2.7k

10k

1.5k

D1

1µF

1µF

4.7µF 4.7µF

2.7k

2.7k

10k

620

D2

GND1

GND2

V GROUND LOOP

≤15V PEAK

VL

SCL

SDA

ALERT

CTRL

REMOTE

LINK

5V

MCU_SDA

MCU_SCL

MCU_INT

MCU_CTRL

5V

LTC4331

VCC

5V

A

B

A1/2

SLO

SPEED1/2

VL

SCL

SDA

ALERT

CTRL

REMOTE

LINK

3.3V

REM_SDA

REM_SCL

REM_INT

REM_CTRL

3.3V

LTC4331

VCC

3.3V

A

B

SLO

SPEED1/2

5V

3.3V

30m CAT5

3.3V

620

620

620

620