ZHCSO90A november   2022  – april 2023 TPS36-Q1

PRODUCTION DATA  

  1.   1
  2. 1 特性
  3. 2 应用
  4. 3 说明
  5. 4 Revision History
  6. 5 器件比较
  7. 6 Pin Configuration and Functions
  8. 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 Timing Diagrams
    9. 7.9 Typical Characteristics
  9. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagrams
    3. 8.3 Feature Description
      1. 8.3.1 Voltage Supervisor
      2. 8.3.2 Window Watchdog Timer
        1. 8.3.2.1 tWC (Close Window) Timer
        2. 8.3.2.2 tWO (Open Window) Timer
        3. 8.3.2.3 Watchdog Enable Disable Operation
        4. 8.3.2.4 tSD Watchdog Start Up Delay
        5. 8.3.2.5 SET Pin Behavior
      3. 8.3.3 Manual RESET
      4. 8.3.4 RESET and WDO Output
    4. 8.4 Device Functional Modes
  10. 9 Application and Implementation
    1. 9.1 Application Information
      1. 9.1.1 CRST Delay
        1. 9.1.1.1 Factory-Programmed Reset Delay Timing
        2. 9.1.1.2 Adjustable Capacitor Timing
      2. 9.1.2 Watchdog Window Functionality
        1. 9.1.2.1 Factory-Programmed watchdog Timing
        2. 9.1.2.2 Adjustable Capacitor Timing
    2. 9.2 Typical Applications
      1. 9.2.1 Design 1: Monitoring Microcontroller Supply and Watchdog During Operational and Sleep Modes
        1. 9.2.1.1 Design Requirements
        2. 9.2.1.2 Detailed Design Procedure
          1. 9.2.1.2.1 Setting Voltage Threshold
          2. 9.2.1.2.2 Determining Window Timings During Operation and Sleep Modes
          3. 9.2.1.2.3 Meeting the Minimum Reset Delay
          4. 9.2.1.2.4 Setting the Watchdog Window
          5. 9.2.1.2.5 Calculating the RESET Pullup Resistor
    3. 9.3 Power Supply Recommendations
    4. 9.4 Layout
      1. 9.4.1 Layout Guidelines
      2. 9.4.2 Layout Example
  11. 10Device and Documentation Support
    1. 10.1 接收文档更新通知
    2. 10.2 支持资源
    3. 10.3 Trademarks
    4. 10.4 静电放电警告
    5. 10.5 术语表
  12. 11Mechanical, Packaging, and Orderable Information

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8.3.4 RESET and WDO Output

The TPS36-Q1 device can offer RESET or RESET with independent WDO output pin. The output configuration is dependent on the pinout variant selected. For a pinout which has only RESET output, the RESET output is asserted when VDD voltage is below the monitored threshold or MR pin voltage is lower than threshold or watchdog timer error is detected. For a pinout which has independent RESET and WDO output pins, the RESET output is asserted when VDD voltage is below the monitored threshold or MR pin voltage is lower than threshold. WDO output is asserted only when watchdog timer error is detected. RESET error has higher priority than WDO error. If RESET is asserted when WDO is asserted, the device deasserts the WDO pin and watchdog is disabled until RESET pin is deasserted and startup delay frame is terminated.

The output will be asserted for tD time when any relevant events described above are detected. The time tD can be programmed by connecting a capacitor between CRST pin and GND or device will assert tD for fixed time duration as selected by orderable part number. Refer Section 5 section for all available options.

Equation 2 describes the relationship between capacitor value and the time tD. Ensure the capacitance meets the recommended operating range. Capacitance outside the recommended range can lead to incorrect operation of the device.

Equation 2. tD (sec) = 4.95 x 106 x CCRST (F)

TPS36-Q1 also offers a unique option of latched output. An orderable with latched output will hold the output in asserted state indefinitely until the device is power cycled or the error condition is addressed. If the output is latched due to voltage supervisor undervoltage detection, the output latch will be released when VDD voltage rises above the VIT- + VHYS level. If the output is latched due to MR pin low voltage, the output latch will be released when MR pin voltage rises above 0.7 x VDD level. If the output is latched due to watchdog timer error, the output latch will be released when a WDI negative edge is detected or the device is shutdown and powered up again. Figure 8-13 shows timing behavior of the device with latched output configuration.

GUID-20230113-SS0I-CLK8-L1WH-NWFSK82NPTC4-low.svg Figure 8-13 Output Latch Timing Behavior
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