ZHCSHU7J August   2005  – March 2021 PCA9555

PRODUCTION DATA  

  1. 1 特性
  2. 2 应用
  3. 3 说明
  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 Electrical Characteristics
    6. 6.6 I2C Interface Timing Requirements
    7. 6.7 Switching Characteristics
    8. 6.8 Typical Characteristics
  7. 7 Parameter Measurement Information
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Device Features
      1. 8.3.1 Power-On Reset (POR)
      2. 8.3.2 I/O Port
    4. 8.4 Device Functional Modes
      1. 8.4.1 Interrupt ( INT) Output
        1. 8.4.1.1 Interrupt Errata
          1. 8.4.1.1.1 INT Description
          2. 8.4.1.1.2 System Impact
          3. 8.4.1.1.3 System Workaround
    5. 8.5 Programming
      1. 8.5.1 I2C Interface
      2. 8.5.2 Register Map
        1. 8.5.2.1 Device Address
        2. 8.5.2.2 Control Register And Command Byte
        3. 8.5.2.3 Register Descriptions
        4. 8.5.2.4 Bus Transactions
          1. 8.5.2.4.1 Writes
          2. 8.5.2.4.2 Reads
  9. 9 Application Information Disclaimer
    1. 9.1 Application Information
      1. 9.1.1 Typical Application
        1. 9.1.1.1 Design Requirements
        2. 9.1.1.2 Design Requirements
          1. 9.1.1.2.1 Minimizing ICC When I/O Is Used To Control Led
        3. 9.1.1.3 Application Curves
  10. 10Power Supply Recommendations
    1. 10.1 Power-On Reset Requirements
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
  12. 12Device and Documentation Support
    1. 12.1 Receiving Notification of Documentation Updates
    2. 12.2 Support Resources
    3. 12.3 Trademarks
    4. 12.4 Electrostatic Discharge Caution
    5. 12.5 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

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8.4.1.1.1 INT Description

The INT will be improperly de-asserted if the following two conditions occur:

  1. The last I2C command byte (register pointer) written to the device was 00h.
    Note:

    This generally means the last operation with the device was a Read of the input register. However, the command byte may have been written with 00h without ever going on to read the input register. After reading from the device, if no other command byte written, it will remain 00h.

  2. Any other slave device on the I2C bus acknowledges an address byte with the R/W bit set high