TI ISO1540/41 Low-Power Bidirectional Isolators
Texas Instruments ISO1540 and ISO1541 low-power, bidirectional isolators are compatible with I²C interfaces. These TI 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, IS01540 and IS1541 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 ISO1540 and ISO1541 enable a complete isolated I²C interface to be implemented within a small form factor.
ISO1540 has two isolated bidirectional channels for clock and data lines while ISO1541 has a bidirectional data and a unidirectional clock channel. ISO1541 is useful in applications that have a single master while ISO1540 is ideally fit for multi-master applications.