SWRU630 December   2024

 

  1.   1
  2.   Description
  3.   Getting Started
  4.   Features
  5. 1Evaluation Module Overview
    1. 1.1 Introduction
    2. 1.2 Key Features
    3. 1.3 Kit Contents
    4. 1.4 Specification
    5. 1.5 Device Information
  6. 2Hardware
    1. 2.1  xWRL6844EVM Antenna
      1. 2.1.1 PCB Material
        1. 2.1.1.1 Transmitter and Receiver Virtual Array
    2. 2.2  EVM Mux Block Diagram
    3. 2.3  Switch Settings
    4. 2.4  Push Button Switches
    5. 2.5  LEDs
    6. 2.6  DC Input Jack
    7. 2.7  USB Connector
    8. 2.8  DCA1000 HD Connector
    9. 2.9  BoosterPack Connector for LaunchPad Connectivity
    10. 2.10 CAN-FD_B Connector
    11. 2.11 CAN-FD_A Connector
    12. 2.12 LIN-PHY Connector
    13. 2.13 I2C Connections
      1. 2.13.1 EEPROM
    14. 2.14 XDS110 Interface
    15. 2.15 FTDI Interface
    16. 2.16 DCA1000EVM Mode
    17. 2.17 PCB Storage and Handling Recommendations:
      1. 2.17.1 PCB Storage and Handling Recommendations
      2. 2.17.2 Higher Power Demanding Applications
  7. 3Software, Development Tools, and Example Code
  8. 4Hardware Design Files
    1. 4.1 Schematics, PCB Layout and Bill of Materials (BOM)
    2. 4.2 EVM Design Database
    3. 4.3 Hardware Design Checklist
  9. 5Additional Information
    1. 5.1 Trademarks
  10. 6References
    1. 6.1 TI E2E Community
  11. 7Revision History

2.1.1.1 Transmitter and Receiver Virtual Array

The transmitter and receiver antenna positions shown in Figure 2-6 form a virtual array of sixteen transmitter and receiver pairs. This allows finer object detections in both azimuth and Elevation planes with an angular resolution of 29°. Receiver antennas are spaced at distance D (λ/2) apart in both azimuth and elevation plane. The transmitter antennas are spaced at distance D (λ) apart in both azimuth and elevation plane.

AWRL6844EVM IWRL6844EVM Antenna Virtual array with respect to TXs and RXs Figure 2-6 Antenna Virtual array with respect to TXs and RXs

Figure 2-7 and Figure 2-8 below show the antenna radiation pattern with regard to azimuth and elevation planes. Both figures show the radiation pattern for TX1, TX2, TX3, TX4 and RX1, RX2, RX3 and RX4 together. All of the measurements were done with a Tx and Rx combination together. Thus, for the -6dB beam width, the user must see a 12dB drop (6dB from Tx and 6dB from Rx)

Note: Wavelength (λ) is computed based on a frequency of 59GHz. Antenna placements were made according to this frequency.

AWRL6844EVM IWRL6844EVM xWRL6844EVM Azimuth Antenna Radiation Pattern Figure 2-7 xWRL6844EVM Azimuth Antenna Radiation Pattern

AWRL6844EVM IWRL6844EVM xWRL6844EVM Elevation Antenna Radiation Pattern Figure 2-8 xWRL6844EVM Elevation Antenna Radiation Pattern

Note: In accordance with the EN 62311 RF exposure test, a minimum separation distance of 20 centimeters must be maintained between the user and the EVM during operation.