Overview
The ISO1540DR, produced by Texas Instruments, is a low-power, bidirectional I2C isolator designed to provide reliable and isolated communication between two different voltage domains. This device is part of the ISO1540 series and is compatible with I2C interfaces, making it suitable for a variety of applications that require isolated communication.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Isolation Voltage | 2.5 | kVrms |
| Operating Temperature | -40 to +125 | °C |
| Supply Voltage Range | 3 to 5.5 | V |
| Maximum Clock Frequency | 1 | MHz |
| Output Sink Current (Side 1) | 3.5 | mA |
| Output Sink Current (Side 2) | 35 | mA |
| Transient Immunity | ±50 | kV/µs (Typical) |
| ESD Protection | 4 kV (all pins), 8 kV (bus pins) | HBM |
| Maximum Junction Temperature | 150 | °C |
Key Features
- Isolated bidirectional I2C communication
- Supports up to 1-MHz operation
- Open-drain outputs with specified sink current capabilities
- Wide operating temperature range: -40°C to +125°C
- High transient immunity: ±50 kV/µs (Typical)
- ESD protection: 4 kV on all pins, 8 kV on bus pins (HBM)
- Safety-related certifications: VDE, CSA, UL, CQC
Applications
- Isolated I2C buses
- SMBus and PMBus interfaces
- Open-drain networks
- Motor control systems
- Battery management systems
- I2C level shifting
Q & A
- What is the isolation voltage of the ISO1540DR?
The isolation voltage of the ISO1540DR is 2.5 kVrms. - What is the operating temperature range of the ISO1540DR?
The operating temperature range is -40°C to +125°C. - What is the maximum clock frequency supported by the ISO1540DR?
The maximum clock frequency supported is 1 MHz. - What are the supply voltage ranges for the ISO1540DR?
The supply voltage range is from 3 V to 5.5 V. - What is the output sink current capability of the ISO1540DR on Side 1 and Side 2?
The output sink current capability is 3.5 mA on Side 1 and 35 mA on Side 2. - What kind of ESD protection does the ISO1540DR offer?
The ISO1540DR offers 4 kV ESD protection on all pins and 8 kV on bus pins (HBM). - What safety-related certifications does the ISO1540DR have?
The ISO1540DR has certifications from VDE, CSA, UL, and CQC. - What are some common applications of the ISO1540DR?
Common applications include isolated I2C buses, SMBus and PMBus interfaces, open-drain networks, motor control systems, battery management systems, and I2C level shifting. - How does the ISO1540DR ensure isolation between the two sides?
The ISO1540DR uses Texas Instruments' Capacitive Isolation technology with a silicon dioxide (SiO2) barrier to ensure isolation. - What is the maximum junction temperature of the ISO1540DR?
The maximum junction temperature is 150°C.
