Overview
The ISOW1432BDFMR is a high-performance, galvanically-isolated RS-485/RS-422 transceiver produced by Texas Instruments. This device integrates a low-emissions DC-DC converter, eliminating the need for a separate isolated power supply in space-constrained designs. It is designed to meet or exceed the requirements of the TIA/EIA-485A standard and offers data rates up to 12 Mbps, making it suitable for high-speed digital communication applications.
Key Specifications
| Parameter | Description | Value |
|---|---|---|
| Package | SOIC (DFM) | 20 pins |
| Operating Temperature Range | -40°C to 125°C | |
| Data Rate | Up to 12 Mbps | |
| Isolation Voltage | 5000 Vrms | |
| Logic Supply (VIO) | 1.71 V to 5.5 V | |
| Power Converter Supply (VDD) | 3 V to 5.5 V | |
| Common Mode Transient Immunity (CMTI) | 100 kV/µs (typical) | |
| ESD Bus Protection | HBM: ±16 kV, IEC 61000-4-2 contact discharge: ±8 kV | |
| GPIO Channel | 2 Mbps | |
| Additional Output Current | 20 mA |
Key Features
- Meets or exceeds the requirements of the TIA/EIA-485A standard.
- Data rates up to 12 Mbps.
- Integrated low-emissions DC-DC converter with low noise performance, meeting CISPR 32 Class B and EN 55032 Class B standards.
- Additional 2 Mbps GPIO channel for diagnostics, LED indication, or supply monitoring.
- High efficiency output power with typical efficiency of 46% and ±5% VISOOUT accuracy.
- Independent power supplies for RS-485 and DC-DC converter.
- RS-485 with PROFIBUS compatibility and open, short, and idle bus failsafe.
- Supports up to 256 nodes on the bus (1/8 unit load).
- Glitch-free power up and power down.
- Reinforced and basic isolation options.
- High CMTI and ESD bus protection.
- Operating temperature range of -40°C to 125°C.
- Current limit and thermal shutdown protection.
Applications
The ISOW1432BDFMR is suitable for various applications requiring secure and high-speed digital communication while maintaining isolation between primary and secondary circuits. These include:
- Industrial control systems.
- Data communication networks.
- Automotive electronics.
- Power distribution systems.
Q & A
- What is the data rate of the ISOW1432BDFMR?
The ISOW1432BDFMR supports data rates up to 12 Mbps.
- What type of isolation does the ISOW1432BDFMR provide?
The ISOW1432BDFMR provides galvanic isolation with a rating of 5000 Vrms.
- What is the operating temperature range of the ISOW1432BDFMR?
The operating temperature range is -40°C to 125°C.
- Does the ISOW1432BDFMR have integrated power management?
Yes, it includes an integrated low-emissions DC-DC converter.
- What is the purpose of the additional GPIO channel?
The additional 2 Mbps GPIO channel is for diagnostics, LED indication, or supply monitoring, eliminating the need for additional digital isolators or optocouplers.
- What are the ESD protection levels of the ISOW1432BDFMR?
The device offers ESD bus protection with HBM: ±16 kV and IEC 61000-4-2 contact discharge: ±8 kV.
- Is the ISOW1432BDFMR compatible with PROFIBUS?
Yes, it is compatible with PROFIBUS and meets the TIA/EIA-485A standard.
- How many nodes can the ISOW1432BDFMR support on the bus?
It supports up to 256 nodes on the bus (1/8 unit load).
- What is the typical efficiency of the DC-DC converter?
The typical efficiency of the DC-DC converter is 46%.
- Does the ISOW1432BDFMR have current limit and thermal shutdown protection?
Yes, it includes current limit and thermal shutdown protection.
