UG298: Si5xxUC-EVB Universal Oscillator Evaluation Board KEY FEATURES This document describes operation of the Silicon Laboratories Si5xxUC-EVB evaluation 2 Evaluation of any Silicon Labs XO or board designed to evaluate any of Silicon Labs pin-controlled or I C configurable Si5xx VCXO (Si51x, Si53x, Si54x, Si55x, Si56x, XOs or VCXOs. Three device sites are available to support one of either 5mm x 7mm, Si57x, Si59x) 3.2mm x 5mm, or 2.5mm x 3.2mm devices in either 4, 6, or 8 pin configurations. AC coupled differential/single-ended output Selector switches make it easy to configure device control pins (pins 1, 2, 7, or 8) for clocks. proper operation without the use of jumpers. Similarly, XO device VDD voltage (3.3V, Voltage control (Vc) port for VCXO 2.5V, 1.8V) can be selected via switches based on either external +5V (for stand-alone evalution. operation) or micro USB sourced +5V USB operation. The EVB also features flexible Switch selectable settings. No jumpers. output termination circuits and PCB layout optimized for superior signal integrity. External power or USB powered. Use stand-alone or with our Pro- grammable Oscillator Calculator SW tool Ext +5V Power Voltage Power Select Selector Supply micro Switch Switches USB +VDD Silicon Labs SDA MCU Pin 1 SCL XO I2C Bus Pin 2 CLK1 P Output +VDD Location 1 Pin 1 Termination Pin 7 GND Signal (5mm x 7mm) Pin 1 CLK1 N Pin 8 Selector SDA Switch Vc In Pin 1 Pin 2 +VDD XO Signal Pin 2 Pin 2 GND CLK2 P Selector Output Location 2 SCL Switch Pin 7 Termination (3.2mm x 5mm) CLK2 N Pin 8 +VDD Pin 7 Signal Pin 7 GND Selector SDA Pin 1 Switch XO Pin 2 CLK3 P Output Pin 8 +VDD Location 3 Pin 7 Termination Signal Pin 8 (2.5mm x 3.2mm) GND CLK3 N Selector Pin 8 SCL Switch Skyworks Solutions, Inc. Phone 781 376-3000 Fax 781 376-3100 sales skyworksinc.com www.skyworksinc.com 1 Rev. 0.5 Skyworks Proprietary Information Products and Product Information are Subject to Change Without Notice July 26, 2021 1Table of Contents 1. Quick Start - Board Configuration Check List ...................3 2. Functional Description............................4 3. General Operational Restrictions........................5 3.1 Evaluate Only a Single Device at a Time .....................5 2 4. Power Supply and I C Bus Control .......................6 5. Control Signal Switch Settings.........................7 5.1 Oscillator Pin 1 Control DIP Switch (Pin 1 Ctrl)...................8 5.2 Oscillator Pin 2 Control DIP Switch (Pin 2 Ctrl)...................9 5.3 Oscillator Pin 7 Control DIP Switch (Pin 7 Ctrl)...................10 5.4 Oscillator Pin 8 Control DIP Switch (Pin 8 Ctrl)...................11 6. Supported Devices - Stand-Alone Mode .................... 12 2 7. Supported Devices - Software Controlled Mode - I C ............... 15 8. USB Port and External Powering....................... 16 9. Output Clock Terminations ......................... 17 10. EVB Test Points and LEDs......................... 18 10.1 Test Points...............................18 10.2 LEDs.................................18 11. VCXO Voltage Control Input Circuit ..................... 19 12. Programmable Oscillator Calculator Tool ................... 20 13. Layout of Board............................. 21 13.1 Si56x XO and VCXO 2.5x3.2mm Footprint Recommendation..............22 14. Si5xxUC-EVB Schematic ......................... 23 Skyworks Solutions, Inc. Phone 781 376-3000 Fax 781 376-3100 sales skyworksinc.com www.skyworksinc.com 2 Rev. 0.5 Skyworks Proprietary Information Products and Product Information are Subject to Change Without Notice July 26, 2021 2