2.5-kVrms, isolated unidirectional clock, bidirectional I2C isolator
Product details
Parameters
Package | Pins | Size
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.
Technical documentation
| Type | Title | Date | |
|---|---|---|---|
| * | Datasheet | ISO154x Low-Power Bidirectional I2C Isolators datasheet (Rev. E) | Apr. 08, 2019 |
| 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 | |
| More literature | UL Certification (Rev. N) | Jul. 30, 2019 | |
| Technical articles | 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 | Simplify current and voltage monitoring with isolated SPI and I2C in your BMS | Jul. 03, 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
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
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
Description
Features
- Inrush current conrol
- Hot Swap output short circuit protection
- Undervoltage and Overvoltage protection
- Lightning Surge support
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 (...)
Description
TPS23881EVM-008 is a 24-port (48-channel) daughter card to evaluate the TPS23881 which is a 4-pair, type-4, 8-channel Power-over-Ethernet (PoE) PSE with 200mΩ sense resistor. This daughter card provides evaluation and reference circuitry for the TPS23881 in high port count applications such as (...)
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
Reference designs
CAD/CAE symbols
| Package | Pins | Download |
|---|---|---|
| SOIC (D) | 8 | View options |
Ordering & quality
- RoHS
- REACH
- Device marking
- Lead finish/Ball material
- MSL rating/Peak reflow
- MTBF/FIT estimates
- Material content
- Qualification summary
- Ongoing reliability monitoring
Recommended products may have parameters, evaluation modules or reference designs related to this TI product.
Support & training
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