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

2.1.1 SWD Interface

The LP-EM-CC35X1 supports Serial Wire Debug (SWD) interface to an external XDS110 or other JTAG-based debuggers. The SWD interface to the CC35xxE device is used for flashing the device and basic debugging. The SWD lines are part of the VIO1 IO ring, the voltage of which can be controlled by shunt J10, see Section 2.2.1 .

The default SWD connection is to the LP-XDS110 20-pin header on the bottom of the LP-EM-CC35X1 (J7).

LP-EM-CC35X1 SWD Interfaces Figure 2-2 SWD Interfaces
Table 2-1 20 pin LP-XDS110 Connector Assignment
Pin Signal Name Description
J7.6 SWCLK Serial wire clock
J7.8 SWDIO Serial wire data in/out
J7.10 XDS_RESET nRESET (enable line to the CC3551E)
J7.12 UART1_TX_XDS The CC3551E UART TX (from CC3551E)

(can be disconnected with jumpers; see Section 2.1.3)
J7.14 UART1_RX_XDS The CC3551E UART RX (to CC3551E) (can be disconnected with jumpers; see Section 2.1.3)
J7.16 VIO1 VIO1 supply reference voltage to connector
J7.18 VCC_BRD_5V 5V supply to LP-EM-CC35X1 from LP-XDS110
J7.1, J7.7, J7.13, J7.19, J7.20 GND Board ground
LP-EM-CC35X1 20-pin LP-XDS110 Connector (J7) Figure 2-3 20-pin LP-XDS110 Connector (J7)

There is also the option to use the ARM Cortex-M 10-pin (CM10) connector for SWD interface. This connector is not assembled by default but a CM10 header can be soldered on the J22 footprint on the LP-EM-CC35X1. For J22 footprint location, see Figure 2-2.

The pinout of the CM10 connector when assembled is shown in Figure 2-4 and Table 2-2.

Note: In addition to assembling the CM10 connector, 0 ohm resisters must change assembly location for SWD interface to this connector. R106 and R107 must be placed on the top two solder pads instead of the default bottom two solder pads, as shown in Figure 2-4.
Table 2-2 CM10 Connector (J22) Assignment
Pin Signal Name Description
J22.1 VIO1 VIO1 supply reference voltage to connector
J22.2 SWDIO Serial wire data in/out (See note)
J22.4 SWCLK Serial wire clock (See note)
J22.10 XDS_RESET nRESET (enable line to the CC3551E)
J22.3, J22.5, J22.7, J22.9 GND Board Ground
LP-EM-CC35X1 CM10 Connector (J22) Figure 2-4 CM10 Connector (J22)