SLLSFF7B May   2021  – August 2026 ISOW1044

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Device Comparison Table
  6. 5 Pin Configuration and Functions
  7. 6 Specifications
    1. 6.1  Absolute Maximum Ratings
    2. 6.2  ESD Ratings
    3. 6.3  Recommended Operating Conditions
    4. 6.4  Thermal Information
    5. 6.5  Power Ratings
    6. 6.6  Insulation Specifications
    7. 6.7  Safety-Related Certifications
    8. 6.8  Safety Limiting Values
    9. 6.9  Electrical Characteristics
    10. 6.10 Supply Current Characteristics
    11. 6.11 Switching Characteristics
    12. 6.12 Insulation Characteristics Curves
    13. 6.13 Typical Characteristics
  8. 7 Parameter Measurement Information
  9. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Power Isolation
    3. 8.3 Signal Isolation
    4. 8.4 CAN Transceiver
    5. 8.5 Remote Wake Request Using Wake-Up Pattern (WUP) in Standby Mode
    6. 8.6 Functional Block Diagram
    7. 8.7 Feature Description
      1. 8.7.1 CAN Bus States
      2. 8.7.2 Digital Inputs and Outputs: TXD (Input) and RXD (Output)
      3. 8.7.3 TXD Dominant Timeout (DTO)
      4. 8.7.4 Power-Up and Power-Down Behavior
      5. 8.7.5 Protection Features
      6. 8.7.6 Floating Pins, Unpowered Device
      7. 8.7.7 Glitch-Free Power Up and Power Down
    8. 8.8 Device Functional Modes
    9. 8.9 Device I/O Schematics
  10. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Application
      1. 9.2.1 Design Requirements
      2. 9.2.2 Detailed Design Procedure
        1. 9.2.2.1 Bus Loading, Length and Number of Nodes
        2. 9.2.2.2 CAN Termination
      3. 9.2.3 Application Curve
        1. 9.2.3.1 Insulation Lifetime
    3. 9.3 Power Supply Recommendations
    4. 9.4 Layout
      1. 9.4.1 Layout Guidelines
      2. 9.4.2 Layout Example
  11. 10Device and Documentation Support
    1. 10.1 Documentation Support
      1. 10.1.1 Related Documentation
    2. 10.2 Receiving Notification of Documentation Updates
    3. 10.3 Support Resources
    4. 10.4 Trademarks
    5. 10.5 Electrostatic Discharge Caution
    6. 10.6 Glossary
  12. 11Revision History
  13. 12Mechanical, Packaging, and Orderable Information

3 Description

The ISOW1044 device is a galvanically-isolated controller area network (CAN) transceiver with a built-in isolated DC-DC converter that eliminates the need for a separate isolated power supply in space-constrained isolated designs. The low-emissions, isolated DC-DC meets CISPR 32 radiated emissions Class B standard with just two ferrite beads on a simple two-layer PCB. Additional 20mA output current can be used to power other circuits on the board. An integrated 10Mbps GPIO channel is available and can help remove an additional digital isolator or optocoupler for diagnostics, LED indication or supply monitoring.

The device supports both classical CAN and CAN FD networks up to 5 Megabits per second (Mbps) data rate. The device offers ±58V DC bus fault protection and ±12V common-mode voltage range. Both signal and power paths are 5kVRMS isolated per UL1577 and are qualified for reinforced and basic isolation per VDE, CSA, TUV and CQC. The bus pins of these devices can endure up to 8kV of IEC 61000-4-2 electrostatic discharge (ESD),.

The ISOW1044 device can operate from a single supply voltage of 4.5V to 5.5V by connecting VIO and VDD together on PCB. If lower logic levels are required, these devices support 1.71V to 5.5V logic supply (VIO) that can be independent from the power converter supply (VDD) of 4.5V to 5.5V. This device supports a wide operating ambient temperature range from –40°C to +125°C and are available in 20-pin DFM (SOIC-20 footprint compatible package) offering a minimum of 8mm creepage and clearance.

The ISOW1044 supports a standby mode and wake over CAN compliant to the ISO 11898-2:2016 defined wake-up pattern (WUP). The device also includes protection and diagnostic features supporting thermal-shutdown (TSD), TXD dominant time-out (DTO) and supply undervoltage detection.

ISOW1044 Simplified Schematic Simplified Schematic