SNLS582C June   2017  – September 2020 FPC402

PRODUCTION DATA  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Description (continued)
  6. 6 Pin Configuration and Functions
    1.     Pin Functions
  7. 7 Specifications
    1. 7.1 Absolute Maximum Ratings
    2. 7.2 ESD Ratings
    3. 7.3 Recommended Operating Conditions
    4. 7.4 Thermal Information
    5. 7.5 Electrical Characteristics
    6. 7.6 Timing Requirements
    7. 7.7 Switching Characteristics
    8. 7.8 Typical Characteristics
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1  Host-Side Control Interface
      2. 8.3.2  LED Control
      3. 8.3.3  Low-Speed Output Signal Control
      4. 8.3.4  Low-Speed Input Status and Interrupt Generation
      5. 8.3.5  Downstream (Port-Side) I2C Master
      6. 8.3.6  Data Prefetch From Modules
      7. 8.3.7  Scheduled Write
      8. 8.3.8  Protocol Timeouts
      9. 8.3.9  General-Purpose Inputs and Outputs
      10. 8.3.10 Hot-Plug Support
    4. 8.4 Device Functional Modes
      1. 8.4.1 I2C Host-Side Control Interface
      2. 8.4.2 SPI Host-Side Control Interface
        1. 8.4.2.1 SPI Frame Structure
        2. 8.4.2.2 SPI Read Operation
        3. 8.4.2.3 SPI Write Operation
    5. 8.5 Programming
  9. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Application
      1. 9.2.1 SFP/QSFP Port Management
        1. 9.2.1.1 Design Requirements
        2. 9.2.1.2 Detailed Design Procedure
        3. 9.2.1.3 Application Curves
  10. 10Power Supply Recommendations
    1. 10.1 Power Supply Sequencing
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
    3. 11.3 Recommended Package Footprint
  12. 12Device and Documentation Support
    1. 12.1 Documentation Support
      1. 12.1.1 Related Documentation
    2. 12.2 Receiving Notification of Documentation Updates
    3. 12.3 Support Resources
    4. 12.4 Trademarks
    5. 12.5 Electrostatic Discharge Caution
    6. 12.6 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

Package Options

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

8.1 Overview

The FPC402 is designed to interface with four ports and aggregate the I2C and low-speed control and status signals associated with these ports into a single host-side interface (I2C or SPI). Multiple FPC402s can be combined to support up to 56 total ports, all of which are controlled via the same host-side interface. This greatly reduces the number of signals which route to the host controller, saving valuable I/O resources, board routing space, and bill of materials (BOM) cost.

Functionally, the FPC402 is organized as shown in Section 8.2. Two types of host-side control interfaces are supported (I2C and SPI) for controlling and monitoring the downstream ports. The FPC402 has two special outputs per downstream port (OUT_C and OUT_D) which can be used to drive port status LEDs.