SLUUDH6 April   2026 CC3501E , CC3551E

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
    1. 1.1 Overview
  5. 2Schematic Considerations - CC35xxE IC
    1. 2.1 Schematic Reference Design
    2. 2.2 Power Supply
      1. 2.2.1 Power Input/Output Requirements
        1. 2.2.1.1 LDO Recommendations
      2. 2.2.2 Boot Sequence
        1. 2.2.2.1 Hosted Mode (Power up by reset pin)
        2. 2.2.2.2 Standalone Mode (Power up when supply above threshold)
        3. 2.2.2.3 SOP Modes
    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
        3. 2.3.2.3 Slow Clock Using an External Crystal (XTAL)
    4. 2.4 Radio Frequency (RF)
    5. 2.5 Digital Interfaces
      1. 2.5.1 xSPI
        1. 2.5.1.1 External Serial Flash
      2. 2.5.2 Serial Wire Debug (SWD)
      3. 2.5.3 Logger
      4. 2.5.4 Coexistence
    6. 2.6 Stacked PSRAM Variant
  6. 3Layout Considerations - CC35xxE IC
    1. 3.1 Layout Reference Design
      1. 3.1.1 Reference Design - CC355xE Dual Band 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 External Flash Layout

3.1 Layout Reference Design

It is recommended to follow the provided reference design and guidelines as close as possible in order to achieve the capabilities of the CC35xxE listed in the data sheet as well as to pass radio certification. These layout guidelines are especially important in the engine area, which includes the sensitive RF components and traces.

The following designs incorporate the layout guidelines given throughout this document. Refer to these as reference sources:

The figures below include the engine area of CC35xxE on the top layer (layer 1) and ground layer (layer 2) for the designs. Note that the engine area as shown in the reference design can be rotated as necessary according to the design requirements.

Note: Before proceeding with any hardware build involving the CC35xxE, it is recommended to submit the design, both schematic and layout, for review.