SLVSG51A April   2021  – February 2022 TPS23882B

PRODUCTION DATA  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Device Comparison Table
  6. 6 Pin Configuration and Functions
    1. 6.1 Detailed Pin Description
  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 Typical Characteristics
  8. 8 Parameter Measurement Information
    1. 8.1 Timing Diagrams
  9. 9 Detailed Description
    1. 9.1 Overview
      1. 9.1.1 Operating Modes
        1. 9.1.1.1 Auto
        2. 9.1.1.2 Autonomous
        3. 9.1.1.3 Semiauto
        4. 9.1.1.4 Manual and Diagnostic
        5. 9.1.1.5 Power Off
      2. 9.1.2 PoE Compliance Terminology
      3. 9.1.3 PoE 2 Type-3 2-Pair PoE
      4. 9.1.4 Requested Class Versus Assigned Class
      5. 9.1.5 Power Allocation and Power Demotion
      6. 9.1.6 Programmable SRAM
    2. 9.2 Functional Block Diagram
    3. 9.3 Feature Description
      1. 9.3.1 Port Remapping
      2. 9.3.2 Port Power Priority
      3. 9.3.3 Analog-to-Digital Converters (ADC)
      4. 9.3.4 I2C Watchdog
      5. 9.3.5 Current Foldback Protection
    4. 9.4 Device Functional Modes
      1. 9.4.1 Detection
      2. 9.4.2 Classification
      3. 9.4.3 DC Disconnect
    5. 9.5 I2C Programming
      1. 9.5.1 I2C Serial Interface
    6. 9.6 Register Maps
      1. 9.6.1 Complete Register Set
      2. 9.6.2 Detailed Register Descriptions
        1. 9.6.2.1  INTERRUPT Register
        2. 9.6.2.2  INTERRUPT MASK Register
        3. 9.6.2.3  POWER EVENT Register
        4. 9.6.2.4  DETECTION EVENT Register
        5. 9.6.2.5  FAULT EVENT Register
        6. 9.6.2.6  START/ILIM EVENT Register
        7. 9.6.2.7  SUPPLY and FAULT EVENT Register
          1. 9.6.2.7.1 Detected SRAM Faults and "Safe Mode"
        8. 9.6.2.8  CHANNEL 1 DISCOVERY Register
        9. 9.6.2.9  CHANNEL 2 DISCOVERY Register
        10. 9.6.2.10 CHANNEL 3 DISCOVERY Register
        11. 9.6.2.11 CHANNEL 4 DISCOVERY Register
        12. 9.6.2.12 POWER STATUS Register
        13. 9.6.2.13 PIN STATUS Register
          1. 9.6.2.13.1 AUTONOMOUS MODE
        14. 9.6.2.14 OPERATING MODE Register
        15. 9.6.2.15 DISCONNECT ENABLE Register
        16. 9.6.2.16 DETECT/CLASS ENABLE Register
        17. 9.6.2.17 Power Priority / 2Pair PCUT Disable Register Name
        18. 9.6.2.18 TIMING CONFIGURATION Register
        19. 9.6.2.19 GENERAL MASK Register
        20. 9.6.2.20 DETECT/CLASS RESTART Register
        21. 9.6.2.21 POWER ENABLE Register
        22. 9.6.2.22 RESET Register
        23. 9.6.2.23 ID Register
        24. 9.6.2.24 Connection Check and Auto Class Status Register
        25. 9.6.2.25 2-Pair Police Ch-1 Configuration Register
        26. 9.6.2.26 2-Pair Police Ch-2 Configuration Register
        27. 9.6.2.27 2-Pair Police Ch-3 Configuration Register
        28. 9.6.2.28 2-Pair Police Ch-4 Configuration Register
        29. 9.6.2.29 Capacitance (Legacy PD) Detection
        30. 9.6.2.30 Power-on Fault Register
        31. 9.6.2.31 PORT RE-MAPPING Register
        32. 9.6.2.32 Channels 1 and 2 Multi Bit Priority Register
        33. 9.6.2.33 Channels 3 and 4 Multi Bit Priority Register
        34. 9.6.2.34 Port Power Allocation Register
        35. 9.6.2.35 TEMPERATURE Register
        36. 9.6.2.36 INPUT VOLTAGE Register
        37. 9.6.2.37 CHANNEL 1 CURRENT Register
        38. 9.6.2.38 CHANNEL 2 CURRENT Register
        39. 9.6.2.39 CHANNEL 3 CURRENT Register
        40. 9.6.2.40 CHANNEL 4 CURRENT Register
        41. 9.6.2.41 CHANNEL 1 VOLTAGE Register
        42. 9.6.2.42 CHANNEL 2 VOLTAGE Register
        43. 9.6.2.43 CHANNEL 3 VOLTAGE Register
        44. 9.6.2.44 CHANNEL 4 VOLTAGE Register
        45. 9.6.2.45 2x FOLDBACK SELECTION Register
        46.       93
        47. 9.6.2.46 FIRMWARE REVISION Register
        48. 9.6.2.47 I2C WATCHDOG Register
        49. 9.6.2.48 DEVICE ID Register
        50. 9.6.2.49 CHANNEL 1 DETECT RESISTANCE Register
        51. 9.6.2.50 CHANNEL 2 DETECT RESISTANCE Register
        52. 9.6.2.51 CHANNEL 3 DETECT RESISTANCE Register
        53. 9.6.2.52 CHANNEL 4 DETECT RESISTANCE Register
        54. 9.6.2.53 CHANNEL 1 DETECT CAPACITANCE Register
        55. 9.6.2.54 CHANNEL 2 DETECT CAPACITANCE Register
        56. 9.6.2.55 CHANNEL 3 DETECT CAPACITANCE Register
        57. 9.6.2.56 CHANNEL 4 DETECT CAPACITANCE Register
        58. 9.6.2.57 CHANNEL 1 ASSIGNED CLASS Register
        59. 9.6.2.58 CHANNEL 2 ASSIGNED CLASS Register
        60. 9.6.2.59 CHANNEL 3 ASSIGNED CLASS Register
        61. 9.6.2.60 CHANNEL 4 ASSIGNED CLASS Register
        62. 9.6.2.61 AUTO CLASS CONTROL Register
        63. 9.6.2.62 CHANNEL 1 AUTO CLASS POWER Register
        64. 9.6.2.63 CHANNEL 2 AUTO CLASS POWER Register
        65. 9.6.2.64 CHANNEL 3 AUTO CLASS POWER Register
        66. 9.6.2.65 CHANNEL 4 AUTO CLASS POWER Register
        67. 9.6.2.66 ALTERNATIVE FOLDBACK Register
        68. 9.6.2.67 SRAM CONTROL Register
          1. 9.6.2.67.1 SRAM START ADDRESS (LSB) Register
          2. 9.6.2.67.2 SRAM START ADDRESS (MSB) Register
          3. 9.6.2.67.3 118
  10. 10Application and Implementation
    1. 10.1 Application Information
      1. 10.1.1 Autonomous Operation
      2. 10.1.2 Introduction to PoE
        1. 10.1.2.1 2-Pair Versus 4-Pair Power and the New IEEE802.3bt Standard
    2. 10.2 Typical Application
      1. 10.2.1 Design Requirements
      2. 10.2.2 Detailed Design Procedure
        1. 10.2.2.1 Connections on Unused Channels
        2. 10.2.2.2 Power Pin Bypass Capacitors
        3. 10.2.2.3 Per Port Components
        4. 10.2.2.4 System Level Components (not Shown in the Schematic Diagrams)
      3. 10.2.3 Application Curves
  11. 11Power Supply Recommendations
    1. 11.1 VDD
    2. 11.2 VPWR
  12. 12Layout
    1. 12.1 Layout Guidelines
      1. 12.1.1 Kelvin Current Sensing Resistors
      2.      138
    2. 12.2 Layout Example
      1. 12.2.1 Component Placement and Routing Guidelines
        1. 12.2.1.1 Power Pin Bypass Capacitors
        2. 12.2.1.2 Per-Port Components
  13. 13Device and Documentation Support
    1. 13.1 Documentation Support
      1. 13.1.1 Related Documentation
    2. 13.2 Receiving Notification of Documentation Updates
    3. 13.3 Support Resources
    4. 13.4 Trademarks
    5. 13.5 Electrostatic Discharge Caution
    6. 13.6 Glossary
  14. 14Mechanical, Packaging, and Orderable Information

10.2.3 Application Curves

Unless otherwise noted, measurements taken on the TPS23882B EVM and Sifos PSA-3000 PowerSync Analyzer with PSA3202 test cards. Test conditions are TJ  = 25 °C, VVDD = 3.3 V, VVPWR = 54 V, VDGND = VAGND, DGND, KSENSA, KSENSB, KSENSC and KSENSD connected to AGND, and all outputs are unloaded, 2xFBn = 0.  Positive currents are into pins.  RS = 0.200 Ω, to KSENSA (SEN1 or SEN2), to KSENSB (SEN3 or SEN4), to KSENSC (SEN5 or SEN6) or to KSENSD (SEN7 or SEN8). All voltages are with respect to AGND unless otherwise noted. Operating registers loaded with default values unless otherwise noted.

GUID-196D10FB-FF70-42FE-A057-C07286CB1D41-low.gifFigure 10-3 ILIM Foldback and Turn-Off
GUID-F0E5DCA0-55B5-47A2-B875-101758C145B0-low.gifFigure 10-5 Open Circuit Detection Signature
GUID-E8B52426-0805-4740-B840-D0B6E87717CA-low.gifFigure 10-7 1-Finger Classification and Turn-On
GUID-BDD1600B-4DE1-41AF-BB4F-82D1883FFF8C-low.gifFigure 10-4 Backoff Due to PCut Fault
GUID-7E897354-E2FD-46F3-A4EF-C949B874E579-low.gifFigure 10-6 Semiauto Mode Discovery with a Valid Class 0-3 Load
GUID-8C4F26A5-67FA-4B1D-9A21-CC00DAB7928F-low.gifFigure 10-8 3-Finger Classification and Turn-On