ISO1540_15 Datasheet, PDF (1/31 Pages) Texas Instruments – Low-Power Bidirectional I2C Isolators

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ISO1540, ISO1541
SLLSEB6C – JULY 2012 – REVISED JUNE 2015
ISO154x Low-Power Bidirectional I²C Isolators
1 Features
•1 Isolated Bidirectional, I²C Compatible,
Communication
• 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
• ±50-kV/µs Transient Immunity (Typical)
• HBM ESD Protection of 4 kV on All Pins;
8 kV on Bus Pins
• Safety and Regulatory Approvals
– 4242-V_PK Isolation per DIN V VDE V 0884-10
(VDE V 0884-10): 2006-12
– 2500-V_RMS Isolation for 1 Minute per UL 1577
– CSA Component Acceptance Notice 5A, IEC
60950-1 and IEC 61010-1 End Equipment
Standards
– CQC Basic Insulation per GB4943.1-2011
2 Applications
• Isolated I²C Buses
• SMBus and PMBus Interfaces
• Open-Drain Networks
• Motor Control Systems
• Battery Management
• I²C Level Shifting
3 Description
The ISO1540 and ISO1541 devices 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 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 optocouplers. The
ISO1540 and ISO1541 devices 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.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
ISO1540
ISO1541
SOIC (8)
4.90 mm × 3.91 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Simplified Schematic
VCC1
VCC2
SDA1
or SCL1
GND1
VREF
SDA2
or SCL2
GND2
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.