Overview
The ISO1540-Q1, produced by Texas Instruments, is a low-power, bidirectional isolator designed to be compatible with I2C interfaces. This device utilizes Texas Instruments' Capacitive Isolation technology, which employs a silicon dioxide (SiO2) barrier to separate the logic input and output buffers. This technology provides advantages in function, performance, size, and power consumption compared to traditional optocouplers. The ISO1540-Q1 is particularly suited for applications requiring isolated I2C communication, such as in electric and hybrid-electric vehicles, isolated I2C buses, and motor control systems.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Operating Frequency | Up to 1 MHz | |
| Supply Voltage Range | 3 V to 5.5 V | |
| Ambient Temperature Range | –40°C to +125°C | °C |
| Junction Temperature Range | –40°C to +136°C | °C |
| Output Sink Current Capability | 3.5 mA (Side 1), 35 mA (Side 2) | mA |
| Transient Immunity | ±50 kV/µs (Typical) | kV/µs |
| Isolation Voltage | 4242 VPK (Transient), 566 VPK (Repetitive Peak) | VPK |
| Package Type | SOIC (8-pin) | |
| Package Size | 4.90 mm × 3.91 mm | mm |
Key Features
- Qualified for automotive applications with AEC-Q100 certification
- Functional Safety-Capable with available documentation for system design
- Isolated bidirectional I2C communication
- Open-drain outputs with specified sink current capabilities
- High transient immunity (±50 kV/µs typical)
- Safety-related certifications including VDE, CSA, UL, and CQC
- Low power consumption with supply current characteristics detailed for various operating conditions
Applications
- Electric and hybrid-electric vehicles
- Isolated I2C buses and SMBus/PMBus interfaces
- Open-drain networks
- Motor control systems
- Battery management systems
- I2C level shifting applications
Q & A
- What is the ISO1540-Q1 used for?
The ISO1540-Q1 is used for isolated bidirectional I2C communication, particularly in applications requiring high isolation and low power consumption, such as in automotive, motor control, and battery management systems.
- What is the operating frequency of the ISO1540-Q1?
The ISO1540-Q1 supports operating frequencies up to 1 MHz.
- What is the supply voltage range for the ISO1540-Q1?
The supply voltage range for the ISO1540-Q1 is from 3 V to 5.5 V.
- What are the key safety certifications for the ISO1540-Q1?
The ISO1540-Q1 has safety-related certifications including VDE, CSA, UL, and CQC, ensuring compliance with various safety standards.
- How does the ISO1540-Q1 achieve isolation?
The ISO1540-Q1 achieves isolation through Texas Instruments' Capacitive Isolation technology, using a silicon dioxide (SiO2) barrier.
- What is the maximum transient isolation voltage for the ISO1540-Q1?
The maximum transient isolation voltage for the ISO1540-Q1 is 4242 VPK.
- What is the ambient temperature range for the ISO1540-Q1?
The ambient temperature range for the ISO1540-Q1 is from –40°C to +125°C.
- What are the typical applications of the ISO1540-Q1 in automotive systems?
In automotive systems, the ISO1540-Q1 is typically used in electric and hybrid-electric vehicles, isolated I2C buses, and motor control systems.
- How does the ISO1540-Q1 handle clock stretching in I2C communication?
The ISO1540-Q1 is designed to handle clock stretching by the target, making it suitable for multi-controller applications.
- What is the package type and size of the ISO1540-Q1?
The ISO1540-Q1 comes in an 8-pin SOIC package with dimensions of 4.90 mm × 3.91 mm.
