SBAS945A February   2022  – July 2022 AMC23C14

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 Switching Characteristics 
    11. 6.11 Timing Diagrams
    12. 6.12 Insulation Characteristics Curves
    13. 6.13 Typical Characteristics
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Analog Input
      2. 7.3.2 Reference Input
      3. 7.3.3 Isolation Channel Signal Transmission
      4. 7.3.4 Open-Drain Digital Outputs
      5. 7.3.5 Power-Up and Power-Down Behavior
      6. 7.3.6 VDD1 Brownout and Power-Loss Behavior
    4. 7.4 Device Functional Modes
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Applications
      1. 8.2.1 Overcurrent and Short-Circuit Current Detection
        1. 8.2.1.1 Design Requirements
        2. 8.2.1.2 Detailed Design Procedure
      2. 8.2.2 Overvoltage and Undervoltage Detection
        1. 8.2.2.1 Design Requirements
        2. 8.2.2.2 Detailed Design Procedure
      3. 8.2.3 Application Curves
    3. 8.3 Best Design Practices
    4. 8.4 Power Supply Recommendations
    5. 8.5 Layout
      1. 8.5.1 Layout Guidelines
      2. 8.5.2 Layout Example
  9. 9 Device and Documentation Support
    1. 9.1 Documentation Support
      1. 9.1.1 Related Documentation
    2. 9.2 Receiving Notification of Documentation Updates
    3. 9.3 Support Resources
    4. 9.4 Trademarks
    5. 9.5 Electrostatic Discharge Caution
    6. 9.6 Glossary
  10. 10Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

7.3.1 Analog Input

The AMC23C14 has a single input that drives both window comparators. Window comparator 1 has an adjustable threshold and window comparator 2 has a fixed threshold.

The positive comparators trip when the input voltage (VIN) rises above the respective VIT+ threshold that is defined as the reference value plus the internal hysteresis voltage (for example, 304 mV for the fixed-threshold comparator). The positive comparators release when VIN drops below the respective VIT– threshold that equals the reference value (for example, 300 mV for the fixed-threshold comparator). The negative comparators trip when VIN drops below the respective VIT– threshold that is defined as the negative reference value minus the internal hysteresis voltage (for example, –304 mV for the fixed-threshold comparator). The negative comparators release when VIN rises above the respective VIT+ threshold that equals the negative reference value (for example –300 mV for the fixed-threshold comparator).

The difference between VIT+ and VIT– is referred to as the comparator hysteresis and is 4 mV for reference voltages below 450 mV. The integrated hysteresis makes the AMC23C14 less sensitive to input noise and provides stable operation in noisy environments without having to add external positive feedback to create hysteresis. The hysteresis of Cmp0 increases to 25 mV for reference values (VREF) greater than 600 mV. See the Section 7.3.2 description for more details.

Figure 7-1 shows a timing diagram of the relationship between hysteresis and switching thresholds.

Figure 7-1 Switching Thresholds and Hysteresis