Si535x-B20QFN-EVB
2
Rev. 0.3
1. Functional Block Diagram
Figures 1 and 2 highlight 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 1.8 (VDDO
only), 2.5, and 3.3 V or powering the device with external supplies (see Section “2. Jumpers” for details). I
2
C
jumpers allow the Si535x to be disconnected from the I
2
C bus, allowing external control from another I
2
C master.
The Si5350 device on this board is a hybrid of the Si5350/51 A, B, and C variants. It can run in stand-alone
asynchronous mode (Si5350/51A) using the onboard 27 MHz XTAL (Y1), or it can be synchronized to an external
clock using the CLKIN SMA connector or test points (Si5350/51C). It can also accept a V
C
input when in VCXO
(Si5350/51B) mode.
Note:
EVBs labelled "REV 1.1" or "REV 1.2" are populated with rev A devices.
Figure 1. EVB Features (Front)
