SLLSFC2D December   2020  – September 2021 ISO1642 , ISO1643 , ISO1644

PRODUCTION DATA  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
  6. 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 Timing Requirements
    12. 6.12 I2C Switching Characteristics
    13. 6.13 GPIO Switching Characteristics
    14. 6.14 Insulation Characteristics Curves
    15. 6.15 Typical Characteristics
  7. 7 Parameter Measurement Information
    1. 7.1 Parameter Measurement Information
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagrams
    3. 8.3 Isolation Technology Overview
    4. 8.4 Feature Description
      1. 8.4.1 Hot Swap
      2. 8.4.2 Protection Features
      3. 8.4.3 GPIO Channels
    5. 8.5 Isolator Functional Principle
      1. 8.5.1 Receive Direction (Left Diagram of Figure 1-1 )
      2. 8.5.2 Transmit Direction (Right Diagram of Figure 1-1 )
    6. 8.6 Device Functional Modes
  9. 9 Application and Implementation
    1. 9.1 Application Information
      1. 9.1.1 I2C Bus Overview
    2. 9.2 Typical Application
      1. 9.2.1 Design Requirements
      2. 9.2.2 Detailed Design Procedure
      3. 9.2.3 Application Curve
    3. 9.3 Insulation Lifetime
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
      1. 11.1.1 PCB Material
    2. 11.2 Layout Example
  12. 12Device and Documentation Support
    1. 12.1 Documentation Support
      1. 12.1.1 Related Documentation
    2. 12.2 Receiving Notification of Documentation Updates
    3. 12.3 Support Resources
    4. 12.4 Trademarks
    5. 12.5 Electrostatic Discharge Caution
    6. 12.6 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

8.5.1 Receive Direction (Left Diagram of Figure 8-5)

When the I2C bus drives SDA2 low, SDA1 follows after a certain delay in the receive path. The output low is the buffered output of VOL1 = 0.65 V, which is sufficiently low to be detected by Schmitt-trigger inputs with a minimum input-low voltage of VIL = 0.9 V at 3 V supply levels.

When SDA2 is released, its voltage potential increases towards VCC2 following the time-constant formed by RPU2 and Cbus. After the receive delay, SDA1 is released and also rises towards VCC1, following the time-constant RPU1 × Cnode. Because of the significant lower time-constant, SDA1 may reach VCC1 before SDA2 reaches VCC2 potential.