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

7.1 Overview

The AMC23C14 is a dual, isolated window comparator with open-drain outputs. Window comparator 1 is comprised of comparator Cmp0 and Cmp1 and window comparator 2 is comprised of Cmp2 and Cmp3. Cmp0 and Cmp2 compare the input voltage (VIN) against their respective positive thresholds (VIT+) and Cmp1 and Cmp3 compare the input voltage (VIN) against their respective negative thresholds (VIT–). The respective VIT+ and VIT– thresholds are of equal magnitude but opposite signs, therefore both window comparators have windows that are centered around 0 V. Window comparator 2 has fixed thresholds of ±300 mV. Window comparator 1 has adjustable thresholds from ±20 mV to ±300 mV through an internally generated 100-μA reference current and a single external resistor.

The open-drain outputs are actively pulled low when the input voltage (VIN) is outside the respective comparison window, but are otherwise in a high-impedance state.

When the voltage on the REF pin is greater than VMSEL, the device operates in positive-comparator mode. This mode is particularly useful for monitoring positive voltage supplies. Both negative comparators (Cmp1 and Cmp3) are disabled and only the positive comparators (Cmp0 and Cmp2) are functional. The reference voltage in this mode can be as high as 2.7 V.

Galvanic isolation between the high- and low-voltage side of the device is achieved by transmitting the comparator states across a SiO2-based, reinforced capacitive isolation barrier. This isolation barrier supports a high level of magnetic field immunity, as described in the ISO72x Digital Isolator Magnetic-Field Immunity application report. The digital modulation scheme used in the AMC23C14 to transmit data across the isolation barrier, and the isolation barrier characteristics itself, result in high reliability and common-mode transient immunity.