Lowest-power, bidirectional I2C isolators extend industrial isolation lifetime
Two new TI isolators improve transient immunity and switching performance
DALLAS, Dec. 12, 2012
DALLAS, Dec. 12, 2012 /PRNewswire/ --Texas Instruments Incorporated (TI)
(NASDAQ: TXN) today introduced a bidirectional isolator family compatible with
I2C interfaces that consumes as much as 38-percent lower power than
competitive devices. Each of the new integrated circuits (ICs) can replace a
typical implementation of 16 or more discrete devices to isolate the I2C
signal in industrial applications. In addition, the ISO1540 and ISO1541 offer
better transient immunity and faster switching times than optocouplers. This
performance provides longer-lasting isolation in a variety of applications,
such as power supplies, networking, telecommunications, Power over Ethernet
(PoE) and battery management systems. For more information and to order
samples, visit www.ti.com/iso1540-pr.
The ISO1540 and ISO1541 employ a unique capacitive isolation technology with a
silicon dioxide barrier (SiO2) to separate logic input and output buffers.
This approach extends the lifetime of the isolators by more than three times
compared to optocouplers or magnetic isolators. The ISO1540 provides two
isolated bidirectional channels for clock and data lines for use in
applications that have multiple masters. The ISO1541 includes a bidirectional
data and a unidirectional clock channel for use in single-master applications.
The I2C isolator family joins TI's portfolio of long-lifetime digital
isolation products, including devices with isolated CAN or RS-485 interface;
isolated amplifiers; or other isolated functions for industrial applications.
Key features and benefits of the ISO1540 and ISO1541
oLowest power: With maximum current of less than 8.5 mA at 5 V, the ISO1540
and ISO1541 reduce power consumption by up to 38 percent compared to
competitive ICs, reducing heat generation in industrial applications.
oFastest switching time: Maximum propagation delay of 62 nanoseconds is
52-percent better than competitive ICs, enabling faster data transfer.
oHigher reliability: ± 50-kV/us typical transient immunity provides better
reliability in harsh environments.
oPrevents internal logic latch: Isolated bidirectional communications is
accomplished within these devices by employing an offset configuration
that prevents device latch-up and ensures reliable operation.
Complete isolated system power
To provide secondary power supply to the ISO1540 and ISO1541, the SN6501
transformer driver can be used in conjunction with a transformer, rectifier
and a regulator, such as TI's 5V TPS70950 or 3.3V TPS70933. The result is a
small, low-cost, high-efficiency, low electro-magnetic interference (EMI)
solution for generating isolated power to the system. The SN6501 evaluation
module can be used to evaluate the performance of these devices in an
application where only a single power supply is available to power both sides
of the isolation barrier.
Tools and support
The ISO1540EVMis available to evaluate device parameters for both the ISO1540
and ISO1541, while acting as a guide for board layout. It can be ordered today
Support is available on the Industrial Interface Forum in the TI E2E™
Community, where engineers designing with the ISO1540 and ISO1541 can ask
questions and get answers from TI experts.
Availability, packaging and pricing
The ISO1540 and ISO1541 are available in industry-standard, 8-pin SOIC
packages. Suggested retail pricing in 1,000-unit quantities is US$2.00 and
Learn more about TI's isolation portfolio by visiting the links below:
oOrder ISO1540 samples: www.ti.com/iso1540s-pr.
oOrder ISO1541 samples: www.ti.com/iso1541s-pr.
oOrder ISO1540 evaluation modules: www.ti.com/iso1540evms-pr.
oOrder the SN6501 evaluation module: www.ti.com/sn6501evms-pr.
oFollow the latest signal chain insights on our blog:
oDownload a news release graphic at: www.ti.com/newscenterphotos-pr.
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