The ISO1540 and ISO1541 are low-power, bidirectional isolators that are 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 ISO1540 and ISO1541 enable a complete isolated I2C interface to be implemented within a small form factor.
The ISO1540 has two isolated bidirectional channels for clock and data lines while the ISO1541 has a bidirectional data and a unidirectional clock channel. The ISO1541 is useful in applications that have a single Master while the ISO1540 is ideally fit for multi-master applications.
Isolated bidirectional communications is accomplished within these devices by offsetting the Side 1 Low-Level Output Voltage to a value greater than the Side 1 High-Level Input Voltage thus preventing an internal logic latch that otherwise would occur with standard digital isolators.
|UL 1577 Isolation Voltage (Single) (kVrms)|
|VDE DIN EN 60747-5-5 Basic Transient Overvoltage Rating (kVpk)|
|VDE DIN EN 60747-5-5 Basic Surge Voltage Rating (kVpk)|
|VDE DIN EN 60747-5-5 Basic Working Voltage Rating (kVpk)|
|CSA Isolation Rating (Vrms)|
|CSA 60950-1 Basic Working (Vrms)|
|CSA 61010-1 Basic Working (Vrms)|
|CSA 61010-1 Reinforced Working (Vrms)|
|Number of Channels (#)|
|Operating Temperature Range (C)|
|Approx. Price (US$)|
|Part #||Name||Product Family||Comments|
|SN6501||Transformer Driver for Isolated Power Supplies||CONVERTER (INTEGRATED SWITCH) - ISOLATED DC/DC CONVERTER||Transfomer driver for generating isolated secondary power supply|
|TPS76350||Single Output LDO, 150mA, Fixed(5.0V), Low Quiescent Current, Thermal Protection||LINEAR REGULATOR (LDO) - SINGLE CHANNEL LDO||Low-dropout (LDO) voltage regulator for isolated secondary power supply|