SWRU612A December   2023  – January 2026 CC3300 , CC3300MOD , CC3301 , CC3301MOD , CC3351 , CC3351MOD

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
    1. 1.1 Overview
  5. 2Schematic Considerations – CC33xx Devices
    1. 2.1 Schematic Reference Design
    2. 2.2 Power Supply
      1. 2.2.1 Power Input/Output Requirements
      2. 2.2.2 Boot Sequence
        1. 2.2.2.1 SOP Modes
      3. 2.2.3 Power Down Sequence
    3. 2.3 Clock Source
      1. 2.3.1 Fast Clock
      2. 2.3.2 Slow Clock
        1. 2.3.2.1 Slow Clock Generated Internally
        2. 2.3.2.2 Slow Clock Using an External Oscillator
    4. 2.4 Radio Frequency (RF)
    5. 2.5 Digital Interfaces
      1. 2.5.1 Reset
      2. 2.5.2 Secure Digital Input Output (SDIO)
        1. 2.5.2.1 SDIO Timing Diagram: Default Speed
        2. 2.5.2.2 SDIO Timing Diagram: High Speed
      3. 2.5.3 Serial Peripheral Interface (SPI)
        1. 2.5.3.1 SPI Timing Diagram
      4. 2.5.4 Universal Asynchronous Receiver-Transmitter (UART)
        1. 2.5.4.1 UART Timing Diagram
      5. 2.5.5 Serial Wire Debug (SWD)
      6. 2.5.6 WLAN Interrupt Request (HOST_IRQ_WL)
      7. 2.5.7 Logger
      8. 2.5.8 Coexistence
  6. 3Layout Considerations – CC33xx Devices
    1. 3.1 Layout Reference Design
      1. 3.1.1 Reference Design – CC330x Single Band Layout
      2. 3.1.2 Reference Design – CC335x Dual Band Layout
      3. 3.1.3 BP-CC3351 Design Layout
      4. 3.1.4 M2-CC3351 Design Layout
    2. 3.2 IC Thermal Pad
    3. 3.3 Radio Frequency (RF)
    4. 3.4 XTAL
    5. 3.5 Power Supplies
    6. 3.6 SDIO
  7. 4Schematic Considerations – CC33xxMOD
    1. 4.1 Schematic Reference Design – CC33xxMOD
    2. 4.2 Power Supply
  8. 5Layout Considerations – CC33xxMOD
    1. 5.1 CC33xxMOD RF Layout Recommendations
  9. 6 CC33xxMOD Regulatory Compliance
    1. 6.1 CC33xxMOD OEM Integration Manual
  10. 7Revision History

2.5.4 Universal Asynchronous Receiver-Transmitter (UART)

UART is the main host interface for BLE, which supports a host controller interface (HCI) transport layer. When a UART is used with a host, take care to connect the UART correctly:

  • Pin 14 is the UART_TX of the device and must be connected to the host side of the RX.
  • Pin 13 is the UART_RX of the device and must be connected to the host side of the TX.
  • Pin 12 is the UART_CTS of the device and must be connected to the host side of the RTS.
  • Pin 13 is the UART_RTS of the device and must be connected to the host side of the CTS.