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Silicon Labs ClockBuilder Desktop software should be used to prepare the register file.  Projects are included on the most reference designs.

Download: ClockBuilder Desktop for SI5338


  1. Install and start ClockBuilder
  2. Select SI5338
  3. Options → Open register map file
    Note: File location <design name>/misc/Si5338/RegisterMap.txt
  4. Modify settings
  5. Options → save C code header files
  6. Replace Header files from modified TE FSBL template or SCU FPGA projects with generated file

Note: SI338 is now included into Clock Builder Pro. Projects for this software are not available, but will be included in the future

Download: ClockBuilder Pro for SI5338


  1. working in process

I2C Configuration

Volatile memory

For Zynq based system Si5338 can be initialized during FSBL execution. For FPGA based modules init can be done by the application MicroBlaze.

Examples are included in the reference designs.

Non-volatile memory (NVM)

NVM can't be programmed on the module. This must be done before the device is assembled.  NVM is only one time programmable, before assembled. Depending of the Module Series, NVM of the SI5338 is empty or preprogrammed with fixed setup, see TRM.


AN408 describes the input termination options for Si5338.

The input termination for Si5338 differential clock inputs if available on B2B connectors on the Trenz Electronic Modules are usually not terminated on the Module. All termination must be on the base board. Please consult Module schematic and AN408.

  • Silicon Labs Appnote AN408

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