ISO1540

ACTIVE

2.5-kVrms, isolated bidirectional clock, bidirectional I2C isolator

A newer version of this product is available
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Exact equivalent in functionality and parametrics to the compared device:
NEW ISO1640 ACTIVE Robust-EMC bidirectional I2C digital isolator Pin-to-pin upgrade with hot-swap capability and improved EMC
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Product details

Parameters

Serial clock Bi-directional Number of channels (#) 2 Isolation rating (Vrms) 2500 Serial data Bi-directional Operating temperature range (C) -40 to 125 Data rate (Max) (Mbps) 1 Surge voltage rating (Vpk) 4000 Supply voltage (Max) (V) 5.5 Supply voltage (Min) (V) 3 open-in-new Find other I2C isolators

Package | Pins | Size

SOIC (D) 8 19 mm² 4.9 x 3.9 open-in-new Find other I2C isolators

Features

  • 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-related certifications:
    • 4242-VPK isolation per DIN VDE V 0884-11:2017-01
    • 2500-VRMS isolation for 1 minute per UL 1577
    • CSA approval per IEC 60950-1 and IEC 62368-1 end equipment standards
    • CQC basic insulation per GB4943.1-2011

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Description

The ISO1540 and ISO1541 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 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 suitable for multi-master applications. For applications where clock stretching by the slave is possible, the ISO1540 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.

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Technical documentation

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Type Title Date
* Datasheet ISO154x Low-Power Bidirectional I2C Isolators datasheet (Rev. E) Apr. 08, 2019
Application note How Do Isolated I2C Buffers with Hot-Swap Capability and IEC ESD Improve ... Mar. 25, 2021
More literature UL Certification (Rev. O) Feb. 03, 2021
Application note How to Replace Optocouplers with Digital Isolators in Standard Interface Circuit Aug. 31, 2020
More literature CSA Certification (Rev. P) Nov. 19, 2019
More literature VDE certificate for basic isolation for DIN VDE V 0884-11:2017-01 (Rev. Q) Sep. 20, 2019
More literature CQC Certification (Rev. F) Sep. 13, 2019
Technical article Top 6 design questions about I2C isolators Mar. 13, 2019
Application note How to isolate signal and power for I2C (Rev. A) Oct. 02, 2018
Application note Designing an Isolated I2C Bus interface by using digital isolators (Rev. A) Mar. 13, 2018
User guide ISO154xEVM_UserGuide May 11, 2012

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Hardware development

EVALUATION BOARD Download
14.99
Description

The MSP430™ CapTIvate™ isolation board (CAPTIVATE-ISO) is an add-on board for the CapTIvate Development Kits (MSP-CAPT-FR2633 or CAPTIVATE-FR2676) that allows a way to maintain Spy-by-Wire, I2C, and UART communication between the CAPTIVATE-PGMR and the CapTIvate MCU Board when the MCU Board is (...)

Features
  • Provides digital isolation for Spy-by-Wire, I2C, and UART
  • No shared power or ground
EVALUATION BOARD Download
document-generic User guide
49
Description

The ISO154xEVM Evaluation Module has been designed to allow the user to evaluate the electrical parameter performance and features of TI's ISO154x family of 3kV I2C isolators which are based on TI's capacitive isolation technology. The ISO154xEVM Evaluation Module provides for the evaluation of:

(...)
Features
  • Isolated Bidirectional, I2C Compatible Communications
  • Supports up to 1 Mbps
  • 3.0-V to 5.5-V Supply Range
  • Open Drain Outputs with 3.5-mA/35-mA Sink Current Capability
DAUGHTER CARD Download
document-generic User guide
Description

The MSP-ISO Isolation board is an easy-to-use plug-in module that offers galvanic isolation between the Debug and Target circuits for MSP430 LaunchPad developers. This is important in cases where the debug circuitry may adversely affect the quality of analog signal measurements made by the MSP430 (...)

Features
  • Isolating target microcontroller from power and data signals removes influence of emulation  hardware in order to improve analog measurements
  • Galvanic isolation between emulation programming and target sides of supported development boards
  • No directly connected data signals
  • No directly connected  (...)

Design tools & simulation

SIMULATION MODEL Download
SLLM189.ZIP (31 KB) - IBIS Model

Reference designs

REFERENCE DESIGNS Download
Temperature Sensor Interface Module for Programmable Logic Controllers (PLC)
TIDA-00018 The TIDA-00018 reference design enables faster development of high precision temperature measurement solutions using 24-Bit delta-sigma ADC and most widely used temperature sensors like thermocouple and RTD. The design guide will address the sensor signal conditioning, thermocouple cold junction (...)
document-generic Schematic document-generic User guide

CAD/CAE symbols

Package Pins Download
SOIC (D) 8 View options

Ordering & quality

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  • Ongoing reliability monitoring

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