LTC4310-1 Datasheet, PDF (1/20 Pages) Linear Technology – Hot-Swappable I2C Isolators

Features
n _{Bidirectional I}²_{C Communication Between Two}
Isolated Buses
n _{Full Isolation with Inexpensive Ethernet}
Transformers or Capacitors
n _{Low Voltage Level Shifting}
n _I²_{C Maximum Operating Frequency:}
100kHz for LTC4310-1
400kHz for LTC4310-2
n _I²_{C Specification Compliant VOL, VIL}
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}
Applications
n _{Isolated I}²_{C, SMBus and PMBus Interfaces}
n _{Isolated Power Supplies}
n _{Positive-to-Negative Rail Communications}
n _{Power-over-Ethernet}
LTC4310-1/LTC4310-2
Hot-Swappable
I²C Isolators
Description
The LTC^®4310 provides bidirectional I²C communications
between two I²C buses whose grounds are isolated from
one another. Each LTC4310 encodes I²C bus logic states
into signals that are transmitted across an isolation barrier
to another LTC4310. The receiving LTC4310 decodes the
transmission and drives its l²C 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 I²C systems.
The LTC4310-2 is intended for 400kHz I²C 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.
Typical Application
1500V Isolated I²C System
10/100Base-TX
3.3V
0.01µF
ETHERNET TRANSFORMER
VCC TXP
RXP VCC
3.3k
3.3k
SDA1
SCL1
LTC4310-1
SDA TXN
SCL RXP
EN
READY
0.01µF
GND RXN
EPF8119S
0.01µF
LTC4310-1
RXN SDA
TXP SCL
EN
READY
TXN GND
0.01µF
3.3k
ISOLATED
5V
3.3k
LTC4310 Operating Through
20kV/µs Common Mode Transient
SCL
0V
SDA
2V/DIV
SDA2
SCL2
20kV/µs
0V
2µs/DIV
500V/
DIV
431012 TA01b
431012 TA01a
431012f