SWRU612 December   2023 CC3300 , CC3301 , CC3351

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
    1. 1.1 Overview
  5. 2Schematic Considerations
    1. 2.1 Schematic Reference Design
    2. 2.2 Power Supply
      1. 2.2.1 Power Input/Output Requirements
      2. 2.2.2 Power-Up Sequence
        1. 2.2.2.1 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
    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)
      5. 2.5.5 Serial Wire Debug (SWD)
      6. 2.5.6 Coexistence
  6. 3Layout Considerations
    1. 3.1 Layout Reference Design
      1. 3.1.1 Reference Design Layout
      2. 3.1.2 BP-CC3301 Design Layout
      3. 3.1.3 M2-CC3301 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

2.2 Power Supply

There are two power rails that must be routed to the CC33xx devices:

  • 1.8 V: VDD_MAIN_IN, VDDA_IN1, VDDA_IN2, VIO, and VPP_IN
  • 3.3V: PA_LDO_IN

The CC33xx device has internal LDO's for regulating the digital core, memory, and power amplifier supplies. The output of the LDO can be measured from DIG_LDO_OUT and PA_LDO_OUT. Please note that the output of PA_LDO_OUT is not enabled until firmware has been loaded onto the device.

For further information on the operating conditions for the supply pins, see Table 2-2.

Table 2-2 Required Device Power
Pin Signal Dir (I/O) Required Voltage (Typical)
1 PA_LDO_OUT O N/A
31 DIG_LDO_OUT O N/A
17 VIO I/O 1.8V
32 VDD_MAIN_IN I 1.8V
4 VDDA_IN1 I 1.8V
5 VDDA_IN2 I 1.8V
35 VPP_IN I 1.8V
39 and 40 PA_LDO_IN I 3.3V