ISO1540 Datasheet, PDF (1/21 Pages) Texas Instruments – Low-Power Bidirectional I2C Isolators

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Low-Power Bidirectional I²C Isolators
Check for Samples: ISO1540, ISO1541
ISO1540
ISO1541
SLLSEB6 – JULY 2012
FEATURES
1
•2 Isolated Bidirectional, I²C Compatible,
Communications
• 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
• 4000-V_PK Isolation per DIN EN 60747-5-2
(VDE 0884 Part 2) (Pending)
• 2500-V_RMS Isolation for 1 minute per UL 1577
(Approved)
• CSA Component Acceptance Notice 5A
(Pending)
• IEC 60950-1 and IEC 61010-1 End Equipment
Standards (Pending)
ISO1540
ISO1541
APPLICATIONS
• Isolated I²C Bus
• SMBus and PMBus Interfaces
• Open-drain Networks
• Motor Control Systems
• Battery Management
• I²C Level Shifting
VCC1 1
SDA1 2
SCL1 3
GND1 4
Side 1
8 VCC2
7 SDA2
6 SCL2
5 GND2
Side 2
VCC1 1
SDA1 2
SCL1 3
GND1 4
Side 1
8 VCC2
7 SDA2
6 SCL2
5 GND2
Side 2
DESCRIPTION
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.
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
I²C is a trademark of NXP B.V Corporation.
2
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2012, Texas Instruments Incorporated