ZHCSDQ6C April   2015  – March 2024 TPS3702-Q1

PRODUCTION DATA  

  1.   1
  2. 1 特性
  3. 2 应用
  4. 3 说明
  5. 4 Pin Configuration and Functions
  6. 5 Specifications
    1. 5.1 Absolute Maximum Ratings
    2. 5.2 ESD Ratings
    3. 5.3 Recommended Operating Conditions
    4. 5.4 Thermal Information
    5. 5.5 Electrical Characteristics
    6. 5.6 Timing Requirements
    7. 5.7 Typical Characteristics
  7. 6 Detailed Description
    1. 6.1 Overview
    2. 6.2 Functional Block Diagram
    3. 6.3 Feature Description
      1. 6.3.1 Input (SENSE)
      2. 6.3.2 Outputs (UV, OV)
      3. 6.3.3 User-Configurable Accuracy Band (SET)
    4. 6.4 Device Functional Modes
      1. 6.4.1 Normal Operation (VDD > UVLO)
      2. 6.4.2 Undervoltage Lockout (V(POR) < VDD < UVLO)
      3. 6.4.3 Power-On Reset (VDD < V(POR))
  8. 7 Application and Implementation
    1. 7.1 Application Information
      1. 7.1.1 Window Voltage Detector Considerations
      2. 7.1.2 Input and Output Configurations
      3. 7.1.3 Immunity to SENSE Pin Voltage Transients
    2. 7.2 Typical Application
      1. 7.2.1 Design Requirements
      2. 7.2.2 Detailed Design Procedure
      3. 7.2.3 Application Curves
    3. 7.3 Power Supply Recommendations
    4. 7.4 Layout
      1. 7.4.1 Layout Guidelines
      2. 7.4.2 Layout Example
  9. 8 Device and Documentation Support
    1. 8.1 Device Support
      1. 8.1.1 Development Support
        1. 8.1.1.1 Evaluation Module
      2. 8.1.2 Device Nomenclature
    2. 8.2 Documentation Support
      1. 8.2.1 Related Documentation
    3. 8.3 支持资源
    4. 8.4 Trademarks
    5. 8.5 静电放电警告
    6. 8.6 术语表
  10. 9 Revision History
  11. 10Mechanical, Packaging, and Orderable Information

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6.3.3 User-Configurable Accuracy Band (SET)

The TPS3702-Q1 has a remarkable feature allowing each device to be set for one of two accuracy bands, Table 8-1 describes the available accuracy bands with nominal thresholds ranging from ±2% to ±10% of the monitored rail nominal voltage. Forcing the voltage on the SET pin above the high-level SET pin input voltage, VIH(SET), sets the thresholds for the tighter window whereas forcing the voltage on the SET pin below the low-level SET pin input voltage, VIL(SET), sets the thresholds for the wider window.

Using the TPS3702Cxxx-Q1 as an example, when VSET ≥ VIH(SET) the nominal thresholds are set to ±4% (see Figure 6-1). Thus, when the positive-going and negative-going threshold accuracy is accounted for, the device outputs an active low signal for voltage excursions outside a ±4.9% band (worst case), which is calculated by taking the nominal threshold percentage for that given part number and adding that value to the threshold accuracy found in the Section 5 section. Similarly, when VSET ≤ VIL(SET), the nominal thresholds are set to ±9% and the device outputs an active low signal for voltage excursions outside the ±9.9% band (worst case).

The ability for the user to change the accuracy band allows a system to programmatically change the accuracy band during certain conditions. One example is during system start up when the monitored voltage can be slightly outside the typical accuracy specifications but a reset signal is not desired. In this case, VSET can be set below VIL(SET) to detect voltage excursions outside the 10% band and, after the system is fully started up, VSET can be pulled higher than VIH(SET), thus tightening the band to ±5%.

GUID-0FDAA305-A7BA-4F75-B6E5-FBE20414F153-low.gifFigure 6-1 TPS3702Cxxx User-Configurable Accuracy Bands

Another benefit of allowing the user to change the accuracy band is the reduction in qualification costs. Users who have multiple rail monitoring needs (such as some rails that must be within ±5% of the nominal voltage and other rails that must be within ±10% of the same nominal voltage) benefit by only having to spend the time and money qualifying one device instead of two.