SLUS634F November   2004  – January 2022 TPS2384

PRODUCTION DATA  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  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 Typical Characteristics
  7. 7 Parameter Measurement Information
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagrams
    3. 8.3 Feature Description
      1. 8.3.1 PMM Faults
      2. 8.3.2 Watchdog Timer
    4. 8.4 Device Functional Modes
      1. 8.4.1  Auto Mode
      2. 8.4.2  Auto Mode Functional Description
        1. 8.4.2.1 AM Discovery
        2. 8.4.2.2 AM Classification
        3. 8.4.2.3 AM Power Delivery
      3. 8.4.3  AM Faults and INTB Output
      4. 8.4.4  Over and Undervoltage Fault
      5. 8.4.5  Over Current or Current Limit Faults
      6. 8.4.6  Undercurrent Fault (DC Modulated Disconnect)
      7. 8.4.7  Power Management Mode (PMM)
        1. 8.4.7.1 13 PMM Functions
      8. 8.4.8  PMM Discovery 1
      9. 8.4.9  PMM Discovery 2
      10. 8.4.10 PMM Classification
      11. 8.4.11 PMM Legacy
      12. 8.4.12 PMM Rup Pwr
      13. 8.4.13 PMM RDWN
    5. 8.5 Programming
      1. 8.5.1 I2C Interface Description
      2. 8.5.2 Start and Stop
      3. 8.5.3 Chip Address
      4. 8.5.4 Chip Addressing
      5. 8.5.5 Data Write Cycle
      6. 8.5.6 Port and Register Cycle
      7. 8.5.7 Data Read Cycle
    6. 8.6 Register Maps
      1. 8.6.1 Register/Port Addressing Map
      2. 8.6.2 Common Read, Register Select
      3. 8.6.3 Common Write, Register Select = 1111 (Test Register)
      4. 8.6.4 Common Control Write, Register Select = 0001
      5. 8.6.5 Port Control Write 1, Register Select = 0010 (One Per Port)
      6. 8.6.6 Port Control Write 2, Register Select = 0011 (One Per Port)
      7. 8.6.7 Port Status Read 1, Register Select = 0100 (One Per Port)
      8. 8.6.8 Port Status Read 2, Register Select = 0101 (One Per Port)
      9. 8.6.9 A/D Results Registers (Discovery Current, Voltage, Current and Temperature)
        1. 8.6.9.1 Discovery Current — Lower Bits, Register Select = 0110 (One Per Port)
        2. 8.6.9.2 Discovery Current — Upper Bits, Register Select = 0111 (One Per Port)
        3. 8.6.9.3 Voltage — Lower Bits, Register Select = 1000 (One Per Port)
        4. 8.6.9.4 Voltage — Upper Bits, Register Select = 1001 (One Per Port)
        5. 8.6.9.5 Current — Lower Bits, Register Select = 1010 (One Per Port)
        6. 8.6.9.6 Current — Upper Bits, Register Select = 1011 (One Per Port)
        7. 8.6.9.7 Temperature — Lower Bits, Register Select = 1100 (One Per Port)
        8. 8.6.9.8 Temperature — Upper Bits, Register Select = 1101 (One Per Port)
  9. 9 Application and Implementation
    1. 9.1 Application Information
      1. 9.1.1 AC Disconnect Drive Circuit Detail
      2. 9.1.2 Connection of Unused Ports and Pins
      3. 9.1.3 Opto-isolator Interface
      4. 9.1.4 Port Protection from Electrical Transients
    2. 9.2 Typical Application
      1. 9.2.1 Design Requirements
      2. 9.2.2 Detailed Design Procedure
        1. 9.2.2.1 Power Pin Bypass Capacitors
        2. 9.2.2.2 Per Port Components
        3. 9.2.2.3 Bias and Timing
      3. 9.2.3 Application Curves
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
      1. 11.1.1 Local Circuits
      2. 11.1.2 System Protection Circuits
    2. 11.2 Layout Example
    3. 11.3 Thermal Consideration
  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

8.4.6 Undercurrent Fault (DC Modulated Disconnect)

Undercurrent fault (dc modulated disconnect) is a condition when the load current that is being measured drops below 7.5 mA and turns on the disconnect timer. If the disconnect timer reaches its time out limit that is set between 300 ms to 400 ms, the corresponding port is turned off and the load disconnect fault code is generated in the Port Status 1 register. If the undercurrent condition goes away prior to the disconnect timer reaching its limit the timer is reset and the port remains powered.

Figure 8-10 shows DC Disconnect event. In this setup, the load current was set right above the 7.5-mA threshold. The duty cycle of the load was then adjusted until the off period exceeded the disconnect time out, causing turn-off of the port. The time-out period was > 300 ms.

GUID-CA657F2A-36AB-4840-AB58-3724466F7144-low.gifFigure 8-10 Port Undercurrent Response in DC Disconnect