ZHCSKD1C October   2019  – January 2021 TCA9511A

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 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 Feature Description
      1. 8.3.1 Hot bus insertion
      2. 8.3.2 Pre-charge voltage
      3. 8.3.3 Rise time accelerators
      4. 8.3.4 Bus ready output indicator
      5. 8.3.5 Powered-off high impedance for I2C and I/O pins
      6. 8.3.6 Supports clock stretching and arbitration
    4. 8.4 Device Functional Modes
      1. 8.4.1 Start-up and precharge
      2. 8.4.2 Bus idle
      3. 8.4.3 Bus active
  9. 9 Application Information Disclaimer
    1. 9.1 Application Information
    2. 9.2 Typical Application
      1. 9.2.1 Design Requirements
        1. 9.2.1.1 Series connections
        2. 9.2.1.2 Multiple connections to a common node
        3. 9.2.1.3 Propagation delays
      2. 9.2.2 Detailed Design Procedure
      3. 9.2.3 Application Curves
    3. 9.3 Typical Application on a Backplane
      1. 9.3.1 Design Requirements
      2. 9.3.2 Detailed Design Procedure
  10. 10Power Supply Recommendations
    1. 10.1 Power Supply Best Practices
    2. 10.2 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 支持资源
    3. 12.3 Trademarks
    4. 12.4 静电放电警告
    5. 12.5 术语表
  13. 13Mechanical, Packaging, and Orderable Information

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10.1 Power Supply Best Practices

In order for the pre-charge circuitry to dampen the effect of hot-swap insertion of the TCA9511A into an active I2C bus, VCC must be applied before the SCL and SDA pins make contact to the main I2C bus. This is essential when the TCA9511A is placed on the add-on card circuit board, as in Section 9.3. Although the pre-charge circuitry exists on both the -IN and -OUT side, the example in Section 9.3 shows SCLIN and SDAIN connecting to the main bus. The supply voltage to VCC can be applied early by ensuring that the VCC and GND pin contacts are physically longer than the contacts for the SCLIN and SDAIN pins. If a voltage supervisor will also be used to control the voltage supply on the add-on card, additional delay will exist before the 1 V pre-charge voltage is present on the SCL and SDA pins.