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ISO1540 Datasheet(PDF) 1 Page - Texas Instruments

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Part # ISO1540
Description  ISO154x-Q1 Low-Power Bidirectional I2C Isolators
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

ISO1540 Datasheet(HTML) 1 Page - Texas Instruments

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VCC2
VCC1
SDA2
or SCL2
SDA1
or SCL1
GND1
GND2
VREF
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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.
ISO1540-Q1, ISO1541-Q1
SLLSEX0 – NOVEMBER 2016
ISO154x-Q1 Low-Power Bidirectional I2C Isolators
1
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-VPK Isolation per DIN V VDE V 0884-10
(VDE V 0884-10): 2006-12
2500-VRMS 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.
Simplified Schematic


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