SI535X-20QFN-EVB Datasheet, PDF (2/14 Pages) Silicon Laboratories – Fully-powered from a single USB port

Si535x-20QFN-EVB
1. Functional Block Diagram
Figure 1 highlights the main features of the EVB. The onboard MCU is responsible for programming the Si535x
timing IC, measuring the device's current consumption reported in the ClockBuilder™ Desktop, managing power,
and controlling status LEDs. VDD and VDDO jumpers allow the option of choosing between 2.5 V and 3.3 V or
powering the device with external supplies (see “2. Jumpers” for details). I²C jumpers allow the Si535x to be
disconnected from the I²C bus, allowing external control from another I²C master.
The device can run in stand-alone asynchronous mode using the onboard 27 MHz XTAL (Y1), or it can be
synchronized to an external clock using the CLKIN SMA connector or TP39/TP40.
Figure 1. EVB Features
2
Preliminary Rev. 0.1