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Adafruit Si5351 Clock Generator Breakout Created by lady ada https://learn.adafruit.com/adafruit-si5351-clock-generator-breakout Last updated on 2021-11-15 06:16:36 PM EST ©Adafruit Industries Page 1 of 26 Table of Contents Overview 3 Pinouts 5 • Power Pins • I2C Pins 5 5 Assembly 7 • Prepare the header strip: • Add the breakout board: • And Solder! 7 7 8 Arduino Code 9 • • • • • • • • • • • 9 9 10 12 12 12 13 13 13 14 14 Wiring for Arduino Download Adafruit_Si5351 Load Demo Sketch Library Reference Begin! Set up the PLL Set up the PLL with 'integer mode' Set up the PLL with 'fractional mode' Set up the clock divider Additional R Divider Software CircuitPython Code 17 • • • • • • • • • 18 18 19 19 20 20 21 23 23 CircuitPython Microcontroller Wiring Python Computer Wiring CircuitPython Installation of SI5351 Library Python Installation of SI5351 Library CircuitPython & Python Usage Configure Phase Lock Loops Configure Clock Outputs Enabling Outputs Full Example Code Python Docs 24 Downloads 25 • Software • Datasheet • Schematic and PCB Print ©Adafruit Industries 25 25 25 Page 2 of 26 Overview Never hunt around for another crystal again, with the Si5351 clock generator breakout from Adafruit! This chip has a precision 25MHz crystal reference and internal PLL and dividers so it can generate just about any frequency, from