SBASAW1A September   2023  – December 2023 AMC21C12

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Pin Configuration and Functions
  6. 5 Specifications
    1. 5.1 Absolute Maximum Ratings
    2. 5.2 ESD Ratings
    3. 5.3 Recommended Operating Conditions
    4. 5.4 Thermal Information 
    5. 5.5 Package Characteristics
    6. 5.6 Electrical Characteristics
    7. 5.7 Switching Characteristics 
    8. 5.8 Timing Diagrams
    9. 5.9 Typical Characteristics
  7. 6 Detailed Description
    1. 6.1 Overview
    2. 6.2 Functional Block Diagram
    3. 6.3 Feature Description
      1. 6.3.1 Analog Input
      2. 6.3.2 Reference Input
      3. 6.3.3 Isolation Channel Signal Transmission
      4. 6.3.4 Open-Drain Digital Output
        1. 6.3.4.1 Transparent Output Mode
        2. 6.3.4.2 Latch Output Mode
      5. 6.3.5 Power-Up and Power-Down Behavior
      6. 6.3.6 VDD1 Brownout and Power-Loss Behavior
    4. 6.4 Device Functional Modes
  8. 7 Application and Implementation
    1. 7.1 Application Information
    2. 7.2 Typical Applications
      1. 7.2.1 Overcurrent Detection
        1. 7.2.1.1 Design Requirements
        2. 7.2.1.2 Detailed Design Procedure
        3. 7.2.1.3 Application Curves
      2. 7.2.2 Overvoltage Detection
        1. 7.2.2.1 Design Requirements
        2. 7.2.2.2 Detailed Design Procedure
        3. 7.2.2.3 Application Curves
    3. 7.3 Best Design Practices
    4. 7.4 Power Supply Recommendations
    5. 7.5 Layout
      1. 7.5.1 Layout Guidelines
      2. 7.5.2 Layout Example
  9. 8 Device and Documentation Support
    1. 8.1 Documentation Support
      1. 8.1.1 Related Documentation
    2. 8.2 Receiving Notification of Documentation Updates
    3. 8.3 Support Resources
    4. 8.4 Trademarks
    5. 8.5 Electrostatic Discharge Caution
    6. 8.6 Glossary
  10. 9 Revision History
  11. 10Mechanical, Packaging, and Orderable Information

Package Options

Refer to the PDF data sheet for device specific package drawings

Mechanical Data (Package|Pins)
  • DEN|8
Thermal pad, mechanical data (Package|Pins)
Orderable Information

6.1 Overview

The AMC21C12 is an isolated window comparator with an open-drain output and optional latch function. The window comparator is comprised of comparator Cmp0 and Cmp1. Cmp0 compares the input voltage (VIN) against the positive threshold (VIT+) and Cmp1 compares the input voltage (VIN) against the negative threshold (VIT–). VIT+ and VIT– are of equal magnitude but opposite signs, therefore the comparison window is centered around 0 V. The comparison threshold is adjustable from ±20 mV to ±300 mV through an internally generated 100-μA reference current and a single external resistor.

The open-drain output is actively pulled low when the input voltage (VIN) is outside the comparison window. The behavior when VIN drops back inside the window is determined by the LATCH pin, as described in the Open-Drain Digital Output section.

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 voltages. The negative comparator (Cmp1) is disabled and only the positive comparator (Cmp0) is 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, 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 note. The digital modulation scheme used in the AMC21C12 to transmit data across the isolation barrier, and the isolation barrier characteristics, result in high reliability and common-mode transient immunity.