TIDUEV4B December   2019  – November 2025

 

  1.   1
  2.   Description
  3.   Resources
  4.   Features
  5.   Applications
  6.   6
  7. 1System Description
    1. 1.1 Key System Specifications
  8. 2System Overview
    1. 2.1 Block Diagram
    2. 2.2 Design Considerations
      1. 2.2.1  Processor – i.MX 7Dual Applications Processor
      2. 2.2.2  i.MX 7Dual Memory Interfaces
        1. 2.2.2.1 DDR3L
        2. 2.2.2.2 Quad SPI NOR Flash
        3. 2.2.2.3 eMMC iNAND
        4. 2.2.2.4 SD Card Connector
      3. 2.2.3  Audio CODEC
      4. 2.2.4  USB to UART Converter
      5. 2.2.5  USB Ports
      6. 2.2.6  LCD Screen Connector
      7. 2.2.7  Mobile Industry Processor Interface (MIPI) CSI Connector
      8. 2.2.8  Mini PCI Express Connector
      9. 2.2.9  CAN Transceiver and Standard Connector
      10. 2.2.10 JTAG Header
      11. 2.2.11 USB2ANY Header
      12. 2.2.12 Functional Switches and Status LEDs
    3. 2.3 Highlighted Products
      1. 2.3.1 TPS6521815 - Power Management IC
      2. 2.3.2 WL1831MOD - Wi-Fi + Bluetooth Module
      3. 2.3.3 DP83867CR - Ethernet PHY
      4. 2.3.4 OPT3001 - Ambient Light Sensor
      5. 2.3.5 INA3221 - Current Monitor
      6. 2.3.6 TPS3808 - Voltage Supervisor for Reset Scheme
      7. 2.3.7 TLV755P, TPS62067, TPS51200 - Auxiliary Power
    4. 2.4 System Design Theory
      1. 2.4.1 Power Estimation
      2. 2.4.2 Power Sequencing
      3. 2.4.3 I2C Device Chain
      4. 2.4.4 Clock Scheme
      5. 2.4.5 BOOT Configuration
      6. 2.4.6 PCB Floor Planning
  9. 3Getting Started, Testing Setup, and Test Results
    1. 3.1 Getting Started With Hardware and Software
      1. 3.1.1 Hardware
        1. 3.1.1.1 Onboard LED Information
      2. 3.1.2 Software
        1. 3.1.2.1 Booting of TIDA-050034
        2. 3.1.2.2 Example Linux Commands for Testing TIDA-050034
  10. 4Design Files
    1. 4.1 Schematics
    2. 4.2 Bill of Materials
    3. 4.3 CAD Files
    4. 4.4 Gerber Files
    5. 4.5 Assembly Drawings
  11. 5Software Files
  12. 6Documentation Support
    1. 6.1 Trademarks
    2.     59
  13. 7Revision History
  14.   A Processor Pin Mapping
    1.     A.1 i.MX 7Dual Pin Mapping

2.3.6 TPS3808 - Voltage Supervisor for Reset Scheme

Figure 2-16 shows the reset scheme for this project. The TPS3808 voltage supervisor senses the VSNS voltage from the coin-cell. Unless the coin-cell is inserted, the TPS3808 supervisor prevents the PMIC from turning on. This is critical to make sure the power-up sequence is correct.

The TPS3808 device has the input MR# connected to RESET Switch and watch dog from processor. If any of the inputs de-asserts (logic low), then this disables the PMIC. Once the reset and VSNVS is stable along with all the power outputs, the PGOOD pin deasserts the Power-ON Reset (POR_B).

TIDA-050034 Reset Scheme With TPS3808 SupervisorFigure 2-16 Reset Scheme With TPS3808 Supervisor