SWRU629 September   2024

 

  1.   1
  2.   Description
  3.   Features
  4.   4
  5. 1Evaluation Module Overview
    1. 1.1 Introduction
    2. 1.2 Kit Contents
    3. 1.3 Specification
    4. 1.4 Device Information
  6. 2Hardware
    1. 2.1 Wired Connections, Jumper Settings, Buttons, and LEDs
      1. 2.1.1  SWD Interface
      2. 2.1.2  I2C Connections
        1. 2.1.2.1 Default I2C Addresses
      3. 2.1.3  UART Signals
      4. 2.1.4  SD Card Interface
      5. 2.1.5  External Memory Interface
      6. 2.1.6  ADC Interface
      7. 2.1.7  Reset Pull-up Jumper
      8. 2.1.8  Push Buttons
      9. 2.1.9  LED Indicators
      10. 2.1.10 LaunchPad Header Pin Assignment
    2. 2.2 Power
      1. 2.2.1 VIO Selection
      2. 2.2.2 Measure the CC35xxE Current Draw
        1. 2.2.2.1 Low Current Measurement (LPDS)
        2. 2.2.2.2 Active Current Measurement
    3. 2.3 Clocking
    4. 2.4 Conducted RF Testing
    5. 2.5 Evaluation Setup
      1. 2.5.1 Wi-Fi Toolbox LP-EM-CC35X1 Hardware Setup
  7. 3Hardware Design Files
    1. 3.1 Schematics
    2. 3.2 PCB Layouts
    3. 3.3 Bill of Materials (BOM)
  8. 4Additional Information
    1. 4.1 Trademarks

2.1.4 SD Card Interface

The CC35xxE supports SD/MMC peripheral to write to SD memory cards. The LP-EM-CC35X1 features a footprint for an SD card slot (J3) on the back of the board.

To use the SD slot, the 693071010811 SD Slot must be assembled on J3 footprint on the back (see Figure 2-8), and some resistors need to have the configuration changed, (see Figure 2-9).

LP-EM-CC35X1 SD Card Slot Figure 2-8 SD Card Slot

On the front side of the board, there are some resistors that need to be changed or added. See Figure 2-9.

  • R34 footprint needs to have a 0 ohm resistor (0402) assembled.
  • R29-R33, R67 need to be placed on the right 2 solder pads instead of the default left two pads.
LP-EM-CC35X1 SD Slot Resistor Change Figure 2-9 SD Slot Resistor Change
Note: Conventional SD memory cards normally require 3.3V interface. Verify that the corresponding VIO ring for these SDMMC lines (VIO1) from the CC35xx is set to 3.3V using the appropriate VIO jumper. For details on this jumper, see Section 2.2.1.