SWRU493C July   2024  – January 2025 CC2564C

 

  1.   1
  2.   Trademarks
  3. 1Introduction to the CC256xCQFN-EM Board
    1. 1.1 Key Features
    2. 1.2 QFN EM Board Applications
  4. 2Module Description
  5. 3Module Detailed Description
    1. 3.1 Pin Description
      1. 3.1.1 Board Jumpers
        1. 3.1.1.1 Measuring Current Consumption
      2. 3.1.2 Antenna and U.FL Selector
      3. 3.1.3 RF Connectors
      4. 3.1.4 Debug Header
      5. 3.1.5 COM Connector
    2. 3.2 Clock Inputs
  6. 4Module Dimensions
  7. 5Tools and Software
    1. 5.1 TI's Bluetooth Software Solution
    2. 5.2 Evaluation Platforms
    3. 5.3 Bluetooth Hardware Evaluation Tool
  8. 6Certification
  9. 7Life Support Policy
  10. 8References
  11. 9Revision History

3.2 Clock Inputs

The slow clock can come from two sources, internal and external to the board. The CC256xCQFN-EM has the option to place the slow clock on the board or source it from an external source. The source is connected to the SLOW_CLK_IN (see Figure 3-5) and can be a digital signal in the range of 0 to 1.8V.

The frequency accuracy of the slow clock must be 32.768kHz and ±250ppm for Bluetooth use (according to the Bluetooth specification).

When the MSP432 Launchpad is connected, the SLOW_CLK_IN signal, is sourced from the oscillator on the CC256xCQFN-EM board, therefore no additional clock source is needed.

CC256xC Clocking Scheme Figure 3-5 CC256xC Clocking Scheme