ISO1541 Bi-directional I²C Isolators

By Texas Instruments 126

ISO1541 Bi-directional I²C Isolators

Texas Instruments' ISO1541 is a low-power, bi-directional isolator that is compatible with I2C interfaces. These devices have their logic input and output buffers separated by TI's capacitive isolation technology using a silicon dioxide (SiO2) barrier. When used in conjunction with isolated power supplies, these devices block high voltages, isolate grounds, and prevent noise currents from entering the local ground and interfering with or damaging sensitive circuitry.

This isolation technology provides for function, performance, size, and power consumption advantages when compared to opto-couplers. The ISO1541 enables a complete isolated I2C interface to be implemented within a small form factor.

  • Isolated bidirectional, I2C compatible, communications
  • Supports up to 1 MHz operation
  • 3 V to 5.5 V supply range
  • Open drain outputs with 3.5 mA side 1 and 35 mA side 2 sink current capability
  • -40°C to +125°C operating temperature
  • Isolated I2C, SMBus, PMBus interfaces
  • Level shifting and hot swap applications
  • Power over Ethernet
  • Power supplies
  • Battery management