Hot-Swappable I2C Isolator Reliable I2C Performance Courtesy of Fully Bidirectional Isolation, Rise Time Acceleration and Stuck Bus Disconnect and Recovery The LTC®4310 is a hot-swappable I2C isolator that provides fully bidirectional SCL and SDA communication between two I2C busses whose grounds are isolated from one another. The LTC4310 simplifies I2C isolation by encoding and transmitting I2C bus signals over an isolation barrier. The signals are decoded and recombined on the other side of the barrier using a second LTC4310, while maintaining I2C signal integrity. The LTC4310 allows the signals to be bridged by an Ethernet transformer to achieve communications across voltage differences of more than 1500VRMS or capacitors for lower voltage differentials. Each I2C bus can be pulled up to a supply voltage ranging from 3V to 5.5V with respect to its local ground, independent of each other. Features Fully Bidirectional SCL and SDA Communication Between Two Isolated Busses Full Isolation with Inexpensive Ethernet Transformers or Capacitors Low Voltage Level Shifting High Logic Low Noise Margin I2C Maximum Operating Frequency: 100kHz for LTC4310-1 400kHz for LTC4310-2 I2C Specification Compliant VOL, VIL ±5kV Human Body Model ESD Protection Rise Time Accelerators SDA, SCL Hot-Swapping Very Low Shutdown Current Stuck Bus Disconnect and Recovery Thermal Shutdown 10-Lead MSOP and 3mm × 3mm DFN Packages LTC4310 Operating Through 20kV/µs Transient* n n n 2V/DIV 0V SCL #1 SDA #1 n n n n n 500V/DIV 20kV/µs 0V n COMMON MODE TRANSIENT FROM GND1 TO GND2 2µs/DIV n n n n www.linear.com/4310 n 1-800-4-LINEAR L, LT, LTC, LTM, Linear Technology, the Linear logo and µModule are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. *“Roundtrip” Configuration (SCL #2 Connected to SDA #2) SPI/Digital or I2C µModule Isolators + Power Complete Isolated Digital Interface with Three Isolated Power Rails— No External Components Required The LTM®2883 is a complete digital µModule® galvanic isolator. The LTM2883’s internal inductive isolation barrier breaks ground loops by isolating the logic level interface for SPI, I2C or general purpose I/O. An onboard DC/DC converter provides power to the internal communications interface and to three adjustable isolated power supply outputs, nominally 5V, 12.5V and –12.5V. Each supply can be adjusted from its nominal value using a single external resistor. The LTM2883’s 2500VRMS isolation, onboard secondary power, digital communications interface and uninterrupted communication through common mode transients greater than 30kV/µs, provides a simple, highly integrated µModule solution for isolated serial data communications. Features 6-Channel Logic Isolator: 2500VRMS n UL Recognized File #E151738 Isolated Adjustable DC Power: 3V to 5V at Up to 30mA ±12.5V at Up to 20mA No External Components Required High Speed Logic Isolation: 10MHz Digital (LTM2883-S) 4MHz Full Duplex SPI (LTM2883-S) 400kHz I2C (LTM2883-I) High Common Mode Transient Immunity: 30kV/μs 3.3V (LTM2883-3) or 5V (LTM2883-5) Operation 1.62V to 5.5V Logic Supply ±10kV HBM ESD Across the Isolation Barrier Common Mode Working Voltage: 560VPEAK Low Current Shutdown Mode (<10µA) 15mm × 11.25mm BGA Package n LTM2883 Operating Through 35kV/µs Common Mode Transients* ® n 2V/DIV 2V/DIV n SCK SDO n REPETITIVE COMMON MODE TRANSIENTS FROM GND TO GND2 n n n 200V/DIV 20ns/DIV n n n *LTM2883-S “Roundtrip” Configuration SCK2 Output Connected to SDO2 Input n www.linear.com/2883 n 1-800-4-LINEAR 0211D