Linear Technology DC1079A-B - LTC4310-2 (400kHz) I²C Isolator DC1079A-B DC1079A-B 数据表

LTC4310-1/LTC4310-2

1

431012fa

Hot-Swappable  

I

2

C Isolators

The LTC

®

4310 provides bidirectional I

2

C communications 

between two I

2

C buses whose grounds are isolated from 

one another. Each LTC4310 encodes I

2

C bus logic states 

into signals that are transmitted across an isolation barrier 

to another LTC4310. The receiving LTC4310 decodes the 

transmission and drives its l

2

C bus to the appropriate logic 

state. The isolation barrier can be bridged by an inexpensive 

Ethernet, or other transformer, to achieve communications 

across voltage differences reaching thousands of volts, or 

it can be bridged by capacitors for lower voltage isolation. 

The LTC4310-1 is intended for use in 100kHz I

2

C systems. 

The LTC4310-2 is intended for 400kHz I

2

C systems. 

Rise time accelerators provide strong pull-up currents on 

SCL and SDA rising edges to meet rise time specifications 

for heavily loaded systems. Data and clock Hot Swap™ 

circuitry prevent data corruption when a card is inserted 

into or removed from a live bus. When a bus is stuck low 

for 37ms, the LTC4310 turns off its pull-down devices 

and generates up to sixteen clocks and a STOP bit in an 

attempt to free the bus. Driving EN low sets the LTC4310 

in a very low current shutdown mode to conserve power.

L

, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear 

Technology Corporation. Hot Swap is a trademark of Linear Technology Corporation. All other 

trademarks are the property of their respective owners.

n

  Bidirectional I

n

  Full Isolation with Inexpensive Ethernet 

n

  Low Voltage Level Shifting

n

  I

n

  I

n

  ±5kV Human Body Model ESD Protection

n

  Rise Time Accelerators

n

  SDA, SCL Hot-Swapping

n

  Very Low Shutdown Current

n

  Stuck Bus Disconnect and Recovery

n

  Thermal Shutdown

n

  10-Lead MSOP and 3mm × 3mm DFN Packages

n

  Isolated I

2

C, SMBus and PMBus Interfaces

n

  Isolated Power Supplies

n

  Positive-to-Negative Rail Communications

n

 Power-over-Ethernet

RXP

10/100Base-TX

ETHERNET TRANSFORMER

EPF8119S

RXN
TXP

SDA

SCL

EN

TXN GND

READY

0.01µF

0.01µF

ISOLATED

5V

3.3V

3.3k

3.3k

3.3k

3.3k

LTC4310-1

VCC

SDA2
SCL2

SDA1

SCL1

0.01µF

0.01µF

431012 TA01a

TXP

TXN

RXP

RXN

SDA
SCL

EN

READY

GND

LTC4310-1

VCC

2µs/DIV

20kV/µs

0V

0V

500V/

DIV

2V/DIV

431012 TA01b

SDA

SCL