ZHCA962 October   2019

 

  1.    说明
  2.    资源
  3.    特性
  4.    应用
  5.    设计图像
  6. 1System Description
    1. 1.1 Key System Specifications
    2. 1.2 Description
  7. 2System Overview
    1. 2.1 Block Diagram
    2. 2.2 Design Considerations
      1. 2.2.1 Input Power
        1. 2.2.1.1 Vpwr
        2. 2.2.1.2 3.3 V
        3. 2.2.1.3 3.3 V_ISO
      2. 2.2.2 Communication Interface
        1. 2.2.2.1 PSE I2C Communication
        2. 2.2.2.2 MCU - Host Communication
      3. 2.2.3 MSP430F523x Hardware Design
    3. 2.3 Highlighted Products
      1. 2.3.1  TPS23882
      2. 2.3.2  MSP430F523x
      3. 2.3.3  ISO7741
      4. 2.3.4  ISO7731
      5. 2.3.5  CSD19538
      6. 2.3.6  LM5017
      7. 2.3.7  LM5020
      8. 2.3.8  LM5050
      9. 2.3.9  INA240
      10. 2.3.10 REF3425
      11. 2.3.11 TPS3890
  8. 3Hardware, Software, Testing Requirement and Test Result
    1. 3.1 Required Hardware and Software
      1. 3.1.1 Hardware
      2. 3.1.2 Software
    2. 3.2 Testing and Results
      1. 3.2.1 Test Setup
        1. 3.2.1.1 Hardware Setup
        2. 3.2.1.2 LED, Test Point, Jumper and Connector Settings
          1. 3.2.1.2.1 EVM LEDs
          2. 3.2.1.2.2 EVM Test Points
          3. 3.2.1.2.3 EVM Jumpers
          4. 3.2.1.2.4 EVM Input and Output Connectors
        3. 3.2.1.3 System Firmware GUI Setup
          1. 3.2.1.3.1 PSE System Firmware GUI Installation
          2. 3.2.1.3.2 PSE System Firmware GUI Operation
      2. 3.2.2 Test Results
  9. 4Design Files
    1. 4.1 Schematic
    2. 4.2 Bill of Materials
    3. 4.3 PCB Layout Recommendations
      1. 4.3.1 Layout Prints
    4. 4.4 Altium Project
    5. 4.5 Gerber Files
    6. 4.6 Assembly Drawings
  10. 5Software Files
  11. 6Related Documentation
    1. 6.1 商标

2.3.11 TPS3890

The TPS3890 device is used to monitor the existence of the power supply and generate power good signal to MCU. The MCU can adjust the total power budget of the system.

The TPS3890 device is a precision voltage supervisor with low-quiescent current that monitors system voltages as low as 1.15 V, asserting an open-drain RESET signal when the SENSE voltage drops below a preset threshold or when the manual reset (MR) pin drops to a logic low. The RESET output remains low for the user-adjustable delay time after the SENSE voltage and manual reset (MR) return above the respective thresholds. The TPS3890 family uses a precision reference to achieve 1% threshold accuracy. The reset delay time can be user-adjusted between 40 μs and 30 s by connecting the CT pin to an external capacitor. The TPS3890 device has a very low quiescent current of 2.1 μA and is available in a small 1.5-mm × 1.5-mm package, making the device well-suited for battery-powered and space-constrained applications.