Overview
The ISO1540-Q1 is a low-power, bidirectional isolator designed by Texas Instruments, 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 automotive, industrial, and medical devices, where high voltage isolation and noise protection are critical.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Operating Temperature | -40°C to +125°C | °C |
| Supply Voltage Range | 3 V to 5.5 V | V |
| Maximum Operating Frequency | Up to 1 MHz | Hz |
| Output Sink Current Capability (Side 1) | 3.5 mA | mA |
| Output Sink Current Capability (Side 2) | 35 mA | mA |
| Transient Immunity | ±50 kV/µs (Typical) | kV/µs |
| Isolation Voltage | 4242 VPK (DIN EN IEC 60747-17) | VPK |
| RMS Isolation Voltage | 2500 VRMS (UL 1577) | VRMS |
| Package Type | SOIC (8-pin) | |
| Body Size | 4.90 mm × 3.91 mm | mm |
Key Features
- Qualified for automotive applications with AEC-Q100 certification.
- Functional Safety-Capable with documentation available for system design.
- Isolated bidirectional, I2C compatible communication.
- Supports up to 1-MHz operation.
- Open-drain outputs with specified sink current capabilities.
- High transient immunity (±50 kV/µs typical).
- Safety-related certifications including VDE, CSA, UL, and CQC.
- Two isolated bidirectional channels for clock and data lines, suitable for multi-controller applications.
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 voltage isolation and noise protection.
- What are the operating temperature ranges for the ISO1540-Q1?
The operating temperature range is -40°C to +125°C.
- What is the maximum operating frequency of the ISO1540-Q1?
The maximum operating frequency is up to 1 MHz.
- What are the output sink current capabilities of the ISO1540-Q1?
The output sink current capability is 3.5 mA on Side 1 and 35 mA on Side 2.
- What safety certifications does the ISO1540-Q1 have?
The ISO1540-Q1 has certifications from VDE, CSA, UL, and CQC, among others.
- How many isolated channels does the ISO1540-Q1 have?
The ISO1540-Q1 has two isolated bidirectional channels for clock and data lines.
- What is the package type and body size of the ISO1540-Q1?
The package type is SOIC (8-pin) with a body size of 4.90 mm × 3.91 mm.
- Is the ISO1540-Q1 suitable for multi-controller applications?
- What is the transient immunity of the ISO1540-Q1?
The transient immunity is ±50 kV/µs (typical).
- What are some common applications of the ISO1540-Q1?
