Brief Introduction

ISO1541DR

<p>2.5-kVrms, isolated unidirectional clock, bidirectional I2C isolator&nbsp;&nbsp;</p><p>The ISO1540 and ISO1541 devices are low-power, bidirectional isolators that are compatible withI2C interfaces. These devices have logic input and output buffers thatare separated by Texas Instruments Capacitive Isolation technology using a silicon dioxide(SiO2) barrier. When used with isolated power supplies, these devices blockhigh voltages, isolate grounds, and prevent noise currents from entering the local ground andinterfering with or damaging sensitive circuitry.<br></p><p>This isolation technology provides for function, performance, size, and power consumptionadvantages when compared to optocouplers. The ISO1540 andISO1541 devices enable a completeisolated I2C interface to be implemented within a small formfactor.</p><p>The ISO1540 has twoisolated bidirectional channels for clock and data lines while the ISO1541 has a bidirectional dataand a unidirectional clock channel. The ISO1541 is useful in applications that have a single master while theISO1540 is suitable formulti-master applications. For applications where clock stretching by the slave is possible, theISO1540 device should beused.</p><p>Isolated bidirectional communication is accomplished within these devices by offsettingthe low-level output voltage on side 1 to a value greater than the high-level input voltage on side1, thus preventing an internal logic latch that otherwise would occur with standard digitalisolators.</p>