ISO1541

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2.5-kVrms, isolated unidirectional clock, bidirectional I2C isolator

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Product details

Parameters

Serial data Bi-directional Serial clock Uni-directional Isolation rating (Vrms) 2500 Number of channels (#) 2 Operating temperature range (C) -40 to 125 Data rate (Max) (Mbps) 1 Surge voltage rating (Vpk) 4000 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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No results found. Please clear your search and try again. View all 11
Type Title Date
* Datasheet ISO154x Low-Power Bidirectional I2C Isolators datasheet (Rev. E) Apr. 08, 2019
Technical articles What the DIN VDE V 0884-11:2017-01 standard means for your isolated designs Feb. 27, 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
More literature UL Certification (Rev. N) Jul. 30, 2019
Technical articles Top 6 design questions about I2C isolators Mar. 13, 2019
Application notes How to isolate signal and power for I2C (Rev. A) Oct. 02, 2018
Application notes Simplify current and voltage monitoring with isolated SPI and I2C in your BMS Jul. 03, 2018
Application notes Designing an Isolated I2C Bus interface by using digital isolators (Rev. A) Mar. 13, 2018
User guides 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 BOARDS Download
Description
The MSP430™ CapTIvate™ isolation board (CAPTIVATE-ISO) provides a way to maintain Spy-by-Wire, I2C, and UART communication between the CAPTIVATE-PGMR and the CapTIvate MCU Board (such as the CAPTIVATE-FR2633) when the MCU Board is powered from an external power source such as a battery (...)
Features
  • Provides digital isolation for Spy-by-Wire, I2C, and UART
  • No shared power or ground
EVALUATION BOARDS Download
document-generic User guide
$49.00
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
EVALUATION BOARDS Download
document-generic User guide
$149.00
Description
The TPS23523 evaluation module (TPS23523EVM-863) contains evaluation and reference circuitry for the TPS23523, which is a low side Hot Swap and Oring controller targeted at telecom applications.
Features
  • Inrush current conrol
  • Hot Swap output short circuit protection
  • Undervoltage and Overvoltage protection
  • Lightning Surge support
DAUGHTER CARDS 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  (...)
DAUGHTER CARDS Download
document-generic User guide
$299.00
Description
The TPS23881EVM-083 daughter card features an 8 channel, IEEE 802.3bt ready PSE controller. When paired with motherboard PSEMTHR24EVM-081  and MCU daughter card PSEMCUDAUEVM-082 (sold separately), users can evaluate a full multiple-port PSE system.

The full PoE Evaluation ecosystem includes the (...)
Features
  • 24 port PoE PSE system and expandable to 48 ports
  • Highly flexible system with configurable GUI and host interface
  • Multiport power management
  • IEEE 802.3bt compliance
  • Mutiple power supplies
  • Supporting Legacy PD

Design tools & simulation

SIMULATION MODELS Download
SLLM190.ZIP (49 KB) - IBIS Model

Reference designs

REFERENCE DESIGNS Download
24-port (PoE 2, 4-pair) power sourcing equipment reference design for multi-port applications
TIDA-050026-23881 — This reference design showcases a Type-4 (PoE 2, 4-Pair) 24-port Ethernet switch for Power over Ethernet (PoE) applications which can send up to 90W per port for for IEEE 802.3bt (PoE 2) applications and up to 120W per port for non-standard applications. Based on the MSP430F523x family, our (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
24-port (PoE 2, 2-pair) power sourcing equipment reference design for multi-port applications
TIDA-050026-23882 — This reference design showcases a Type-3, 30W, 2-Pair 24-port Ethernet switch for Power over Ethernet (PoE) applications which can send up to 30W per port for IEEE 802.3bt Type 3 applications and up to 60W per port for non-standard applications. Based on the MSP430F523x family, TI's TPS2388x FirmPSE (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Isolated power architecture reference design for communication and analog input/output modules
TIDA-00300 This reference design provides a simple means through which to isolate I2C or SPI type communication lines. This is often required in Grid Infrastructure applications such as, protertion relays and circuit breakers, where high voltages are involved. This reference design provides the complete (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Type 2 PoE PSE, 6kV Lightning Surge Reference Design
TIDA-01411 — This reference design provides lightning surge protection solution for Power over Ethernet (PoE) Power Sourcing Equipment (PSE) systems based on TI's TPS23861 PSE controller. The need for implementing such protection will normally depend on the environment in which the PSE is intended to operate and (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Industrial Battery Management Module for 20S Applications Reference Design
TIDA-01093 — High serial cell count battery (>15s) systems are becoming more and more common for industrial applications. These applications are cost sensitive and require a simple solution that includes monitoring, protection, and control or even SOC (State of Charge) information rather than only basic (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
20-bit, 1-MSPS Isolator Optimized Data Acquisition Reference Design Maximizing SNR and Sample Rate
TIDA-01037 — TIDA-01037 is a 20-bit, 1 MSPS isolated analog input data acquisition reference design that utilizes two different isolator devices to maximize signal chain SNR and sample rate performance. For signals requiring low jitter, such as ADC sampling clocks, TI’s ISO73xx family of low jitter devices (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
-48V Telecom Current/Voltage/Power Sense with Isolation
TIDA-00313 This verified design can accurately measure current, voltage and power on a bus that carries -48V and is able to provide this data using an I²C compatible interface. This design is targeted for Telecom applications because the most common Telecom equipment’s are fed with this negative (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
EEPROM Programming Tool Reference Design
TIDA-01373 — The TIDA-01373 is a reference hardware and software example of a scalable programming tool for the DRV10983, DRV10975, DRV10983-Q1, and DRV10987 integrated BLDC motor drivers. These devices feature configurable EEPROM registers that need to be set to motor-specific parameters. This reference design (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
20-bit Isolated Data Acquisition Reference Design Optimizing Jitter for Max SNR and Sample Rate
TIDA-01035 — The TIDA-01035 is a 20-bit, 1 MSPS isolated analog input data acquisition reference design demonstrating how to resolve and optimize performance challenges typical of digitally isolated data acquisition systems.
  • Significantly improves high frequency AC signal chain performance (SNR  and THD) by (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
EMC Compliant, Group Isolated, 2-Channel Binary Input Module for Wide AC/DC Input Reference Design
TIDA-00809 — The TIDA-00809 TI design showcases a cost optimized architecture that improves resolution of a binary input module. A microcontroller unit (MCU) is shared between two input channels (group isolation) to minimize the cost per channel. Wide input range is covered using an amplifier with gain and a MCU (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Communication Module Reference Design for Functional Isolated RS-485, CAN and I2C Data Transmission
TIDA-01281 — The TIDA-01281 reference design is low cost, high efficiency, isolated RS-485, I2C & CAN communication module solution intended for use in industrial systems such as Uninterruptable Power Supplies (UPS) and energy storage banks that require isolated communication and isolated power for (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Digitally Isolated 2-Channel, Wide DC Binary Input Module Reference Design
TIDA-00420 This reference design enables translation of high DC voltage inputs upto 300VDC into binary logic level voltages that a typical electronic circuit can handle. This solution is very flexible, not only handling input voltages from 18 to 300VDC but also allowing programmable switching thresholds to set (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
18-bit, 2-Msps Isolated Data Acquisition Reference Design to Achieve Maximum SNR and Sampling Rate
TIDA-00732 This “18-bit, 2-Msps Isolated Data Acquisition Reference Design to achieve maximum SNR and sampling rate”  illustrates how to overcome performance-limiting challenges typical of isolated data acquisition system design:
  • Maximizing sampling rate by minimizing propagation delay introduced by digital (...)
document-generic Schematic document-generic User guide

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