2. Functional Description
The Si5xxUC-EVB is an evaluation board designed to support any Silicon Labs XO/VCXO device. The Si5xxUC-EVB is designed to
operate in one of two general operational modes:
•
Stand-alone mode
: The stand-alone mode is for evaluation of
fixed output frequency or pin-controlled XO/VCXO devices
where I2C support is NOT required to operate or evaluate the device. Control of device pins, such as OE or FS, is done via on-board
switches. In Stand-alone mode the on-board switches must be set according to the requirements of the device installed on the
board. For example, if the installed device is a dual frequency part with output enable, the appropriate switches must be set to assert
output enable (OE) and the frequency select pin (FS) to give the desired output frequency. Device VDD voltage can be set via on-
board switches as well. Switch setting details for Stand-alone mode are shown in Section
4. Power Supply and I2C Bus Control
5. Control Signal Switch Settings
(for device pins).
•
Software controlled mode
: The software controlled mode is for use with PC-based software tools (such as our
) to control/configure the device being evaluated via the device I2C bus. The software controlled mode is pri-
marily intended for
I2C controlled XO/VCXO devices
. When using software controlled mode, some of the on-board switches must
be placed in specific default settings to allow the on-board MCU to perform I
2
C control. Other switches must still be used on certain
device signals, like output enable (OE). Switch setting details for software controlled mode are shown in Section
(for power supply & I2C) and Section
5. Control Signal Switch Settings
For each of the 3 device locations on the Si5XXUC-EVB, separate sets of SMA outputs and terminations are provided per XO “Device
Under Test” (DUT) location even though only one device may be populated and used at a time (see Section
below). Separate outputs and terminations per device site provides the best possible clock signal integrity for each DUT
location.
UG298: Si5xxUC-EVB
Functional Description
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