ZHCSM34M May   2004  – March 2023 TPS3808

PRODUCTION DATA  

  1. 1 特性
  2. 2 应用
  3. 3 说明
  4. 4 Revision History
  5. 5 Device Voltage Thresholds
  6. 6 Pin Configuration and 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 Switching Characteristics
    7. 7.7 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 SENSE Input
      2. 8.3.2 Selecting the RESET Delay Time
      3. 8.3.3 Manual RESET ( MR) Input
      4. 8.3.4 RESET Output
    4. 8.4 Device Functional Modes
      1. 8.4.1 Normal Operation (VDD > VDD(min))
      2. 8.4.2 Above Power-On Reset but Less Than VDD(min) (VPOR < VDD < VDD(min))
      3. 8.4.3 Below Power-On Reset (VDD < VPOR)
  9. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Application
      1. 9.2.1 Design Requirements
      2. 9.2.2 Detailed Design Procedure
        1. 9.2.2.1 Immunity to SENSE Pin Voltage Transients
      3. 9.2.3 Application Curve
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
  12. 12Device and Documentation Support
    1. 12.1 Device Support
      1. 12.1.1 Development Support
        1. 12.1.1.1 Evaluation Modules
    2. 12.2 Documentation Support
      1. 12.2.1 Related Documentation
    3. 12.3 支持资源
    4. 12.4 Trademarks
    5. 12.5 静电放电警告
    6. 12.6 术语表
  13. 13Mechanical, Packaging, and Orderable Information

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8.3.3 Manual RESET ( MR) Input

The manual reset ( MR) input allows a processor or other logic circuits to initiate a reset. A logic low (0.3 VDD) on MR causes RESET to assert. After MR returns to a logic high and SENSE is above its reset threshold, RESET is de-asserted after the user-defined reset delay expires. Note that MR is internally tied to VDD using a 90-kΩ resistor, so this pin can be left unconnected if MR is not used.

See Figure 8-3 for how MR can be used to monitor multiple system voltages. Note that if the logic signal driving MR does not go fully to VDD, there is some additional current draw into VDD as a result of the internal pullup resistor on MR. To minimize current draw, a logic-level FET can be used as illustrated in Figure 8-4.

GUID-6744F781-E159-4C01-B46F-9A3C12A9F3EC-low.gifFigure 8-3 Using MR to Monitor Multiple System Voltages
GUID-1067D53A-E4FB-46E4-9948-5E9A83AB1083-low.gifFigure 8-4 Using an External MOSFET to Minimize IDD When MR Signal Does Not Go to VDD