ISO1540-Q1 Datasheet, PDF (1/30 Pages) Texas Instruments – ISO154x-Q1 Low-Power Bidirectional I2C Isolators

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ISO1540-Q1, ISO1541-Q1
SLLSEX0 – NOVEMBER 2016
ISO154x-Q1 Low-Power Bidirectional I²C Isolators
1 Features
•1 Qualified for Automotive Applications
• AEC-Q100 Qualified With the Following Results:
– Device Temperature Grade 1: –40°C to
+125°C Ambient Operating Temperature
– Device HBM ESD Classification Level 3A
– Device CDM ESD Classification Level C6
• 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
• ±50-kV/µs Transient Immunity (Typical)
• Safety-Related Certifications:
– 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
– UL 1577 Certification Complete; All Other
Certifications Planned
2 Applications
• Electric and Hybrid-Electric Vehicles
• Isolated I²C Buses
• SMBus and PMBus Interfaces
• Open-Drain Networks
• Motor Control Systems
• Battery Management
• I²C Level Shifting
3 Description
The ISO1540-Q1 and ISO1541-Q1 devices are low-
power, bidirectional isolators that are compatible with
I²C interfaces. These devices have logic input and
output buffers that are separated by Texas
Instruments 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-Q1 and ISO1541-Q1 devices enable a
complete isolated I²C interface to be implemented
within a small form factor.
The ISO1540-Q1 has two isolated bidirectional
channels for clock and data lines while the ISO1541-
Q1 has a bidirectional data and a unidirectional clock
channel. The ISO1541-Q1 is useful in applications
that have a single master while the ISO1540-Q1 is
suitable for multi-master applications. For applications
where clock stretching by the slave is possible, the
ISO1540-Q1 device should be used.
Isolated bidirectional communication is accomplished
within these devices by offsetting the low-level output
voltage on side 1 to a value greater than the high-
level input voltage on side 1, thus preventing an
internal logic latch that otherwise would occur with
standard digital isolators.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
ISO1540-Q1
ISO1541-Q1
SOIC (8)
4.90 mm × 3.91 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
VCC1
Simplified Schematic
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.