TIDUF96 October   2024

 

  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 Power Topology
      2. 2.2.2 PCB and Form Factor
      3. 2.2.3 Antenna
    3. 2.3 Highlighted Products
      1. 2.3.1 AWRL1432BGAMFQ1
      2. 2.3.2 TPS628502-Q1
      3. 2.3.3 LMR43620-Q1
      4. 2.3.4 TLIN1021A-Q1
  9. 3Hardware, Software, Testing Requirements, and Test Results
    1. 3.1 Hardware Requirements
      1. 3.1.1 Getting Started With Hardware
        1. 3.1.1.1 Primary Power Up Option
          1. 3.1.1.1.1 Making the Connections in Primary Power Up Option
        2. 3.1.1.2 Secondary Power Up Option
          1. 3.1.1.2.1 Making the Connections in Secondary Power Up Option
        3. 3.1.1.3 Sense-on-Power (SOP)
        4. 3.1.1.4 AWRL1432 Initialization: Board Programming
    2. 3.2 Test Setup
    3. 3.3 Test Results
  10. 4Design and Documentation Support
    1. 4.1 Design Files
      1. 4.1.1 Schematics
      2. 4.1.2 BOM
      3. 4.1.3 Layout Prints
      4. 4.1.4 Altium Project
      5. 4.1.5 Gerber Files
    2. 4.2 Tools and Software
    3. 4.3 Documentation Support
    4. 4.4 Support Resources
    5. 4.5 Trademarks
  11. 5About the Authors

1 System Description

This reference design utilizes AWRL1432, TI’s 77GHz mmWave radar sensor and a fully automotive compliant Bill of Material (BOM). The small form factor allows an easy evaluation capability and integration into the end application system

AWRL1432 device operation is based on Frequency-Modulated Continuous Wave (FMCW) technology. Using two TX antennas for transmitting and two RX antennas for receiving RF signals, this FMCW radar system can capture various data points associated with the distance, angle, and velocity of the reflected radar signal that can be translated into specific gestures or presence being detected.

The battery power (DC supply – typically 12V) connects to the VBAT pin of the J2 connector. The wide VIN buck, LM43620-Q1, is utilized to convert this input supply to a 3.3V output. The TPS628502-Q1 then takes the 3.3V input and creates 1.8V rail. The AWRL1432 device powered by these two rails (3.3V and 1.8V) in BOM optimized power topology (3.3V I/O topology) enables the design to have an extremely small form factor.

The reference design comes with an onboard Local Interconnect Network (LIN) physical layer (PHY) which helps in communicating with an external automotive network. This design also supports an SPI-based raw data capture.