Silicon Laboratories Si5342-EVB Manuel utilisateur
Rev. 1.0 5/15 Copyright © 2015 by Silicon Laboratories Si5342-EVB
Si5342-EVB
Si5342 EVALUATION BOARD USER’SGUIDE
Description
The Si5342-EVB is used for evaluating the Si5342
Any-Frequency, Any-Output, Jitter-Attenuating Clock
Multiplier. The Si5342 combines 4th generation DSPLL
and Multisynthtechnologies to enable any-frequency
clock generation for applications that require the highest
level of jitter performance. The Si5342-EVB can be
controlled and configured using the ClockBuilder Pro
(CB Pro) software tool.
EVB Features
Powered from USB port or external power supply.
Onboard 48 MHz XTAL or Reference SMA Inputs
allow holdover mode of operation on the Si5342.
CBProGUI programmable VDD supply allows
device to operate from 3.3, 2.5, or 1.8 V.
CBProGUI programmable VDDO supplies allow
each of the 4 outputs to have its own power supply
voltage selectable from 3.3, 2.5, or 1.8 V.
CBProGUI allows control and measurement of
voltage, current, and power of VDD and all 4 VDDO
supplies.
Status LEDs for power supplies and control/status
signals of Si5342.
SMA connectors for input clocks, output clocks, and
optional external timing reference clock.
Figure 1. Si5342 Evaluation Board
Si5342-EVB
2 Rev. 1.0
1. Si5342-EVB Functional Block Diagram
Below is a functional block diagram of the Si5342-EVB. This EVB can be connected to a PC via the main USB
connector for programming, control, and monitoring. See section “3. Quick Start” or section “9. Installing
ClockBuilderPro (CBPro) Desktop Software” for more information.
Figure 2. Si5342-EVB Functional Block Diagram
Si5342-EVB
Rev. 1.0 3
2. Si5342-EVB Support Documentation and ClockBuilderProSoftware
All Si5342 schematics, BOMs, User’s Guides, and software can be found online at the following link:
http://www.silabs.com/products/clocksoscillators/pages/si538x-4x-evb.aspx
3. Quick Start
1. Install ClockBuilderProdesktop software from http://www.silabs.com/CBPro.
2. Connect a USB cable from Si5342-EVB to the PC where the software was installed.
3. Leave the jumpers as installed from the factory, and launch the ClockBuilderPro software.
4. You can use ClockBuilderProto create, download, and run a frequency plan on the Si5342-EVB.
5. For the Si5342 data sheet, go to http://www.silabs.com/timing.
Si5342-EVB
4 Rev. 1.0
4. Jumper Defaults
Refer to the Si5342 EVB schematics for the functionality associated with each jumper.
Si5342EVBJumperDefaults
Location Type I=Installed
0=Open Location Type I=Installed
0=Open
JP1 2 pin I
JP2 2 pin I
JP3 2 pin O
JP4 2 pin O
JP5 3 pin 1 to 2 (USB)
JP13 2 pin O
J17 5x2 Hdr All 5 installed
Si5342-EVB
Rev. 1.0 5
5. Status LEDs
D5, D7, D14, D15, D16, and D17 are status LEDs indicating the device alarms currently asserted. D11 is
illuminated when USB +5 V supply voltage is present. D12 and D13 are status LEDs showing on-board MCU
activity.
Figure 3. Status LEDs
Si5342EVBStatusLEDs
Location Silkscreen Color StatusFunctionIndication
D5 INTRB Blue MCU INTR (Interrupt) active
D7 LOLB Blue MCU INTR (Interrupt) active
D14 LOS0B* Blue IN0 Loss of Signal indicator
D15 LOS1B* Blue IN0 Loss of Signal indicator
D16 LOS3B* Blue IN0 Loss of Signal indicator
D17 LOS2B* Blue IN0 Loss of Signal indicator
D11 +5V MAIN Green Main USB +5V present
D12 READY Green MCU Ready
D13 BUSY Green MCU Busy
Note: The LOSxB LEDs may be dim when the EVB is first plugged in. Once
ClockBuilderPro is launched, the LEDs will begin to function normally.
Si5342-EVB
6 Rev. 1.0
6. Clock Input Circuits (INx/INxB)
The Si5342-EVB has eight SMA connectors (IN0/IN0B–IN3/IN3B) for receiving external clock signals. All input
clocks are terminated as shown in Figure 4 below. Note input clocks are AC coupled and 50 ohm terminated. This
represents 4 differential input clock pairs. Single-ended clocks can be used by appropriately driving one side of the
differential pair with a single-ended clock. For details on how to configure inputs as single-ended, please refer to
the Si5342 data sheet. Typically a 0.1 F DC block is sufficient, however, 10 F may be needed for lower input
frequencies. Note that the EVB is populated with both DC block capacitor values.
Figure 4. Input Clock Termination Circuit
7. Clock Output Circuits (OUTx/OUTxB)
Each of the four output drivers (2 differential pairs) is AC coupled to its respective SMA connector. The output clock
termination circuit is shown in Figure 5 below. The output signal will have no DC bias. If DC coupling is required,
the AC coupling capacitors can be replaced with a resistor of appropriate value. The Si5342-EVB provides an
L-network at OUT0/OUT0B output pins for optional output termination resistors. Note that components with
schematic “NI” designation are not normally populated.
Figure 5. Output Clock Termination Circuit
Si5342-EVB
Rev. 1.0 7
8. External Reference Clock Input Circuit (XA/XB)
The Si5342 EVB supports either XTAL or external reference clock on XA/XB. By default, the XTAL is populated. If
a reference clock is required for testing, remove Y1 and place C93/C94. A low-jitter reference clock can then be
applied to J25/J26. Note that XA/XB is the jitter reference for the device. Jitter performance at the output of the
Si5342 will depend on the jitter performance of the reference clock at XA/XB.
Figure 6. External Reference Clock Termination Circuit
Si5342-EVB
8 Rev. 1.0
9. Installing ClockBuilderPro (CBPro) Desktop Software
To install the CBOPro software on any Windows 7 (or above) PC:
Go to http://www.silabs.com/CBPro and download ClockBuilderPro software.
Installation instructions and User’s Guide for ClockBuilderProcan be found at the download link shown above.
Please follow the instructions as indicated.
10. Using the Si5342 EVB
10.1. Connecting the EVB to Your Host PC
Once ClockBuilderProsoftware is installed, connect to the EVB with a USB cable as shown below.
Figure 7. EVB Connection Diagram
10.2. Additional Power Supplies
Although additional power (besides the power supplied by the host PC’s USB port) is not needed for most
configurations, two additional +5 VDC power supplies (MAIN and AUX) can be connected to J33 and J34 (located
on the bottom of the board, near the USB connector). Refer to the Si5342-EVB schematic for details.
Si5342-EVB
Rev. 1.0 9
10.3. Overview of ClockBuilderPro Applications
The ClockBuilderProinstaller will install two main applications:
Figure 8. Application #1: ClockbuilderPro Wizard
Use the CBPro Wizard to:
Create a new design
Review or edit an existing design
Export: create in-system programming
Figure 9. Application #2: EVB GUI
Use the EVB GUI to:
Download configuration to EVB’s DUT (Si5342)
Control the EVB’s regulators
Monitor voltage, current, power on the EVB
Si5342-EVB
10 Rev. 1.0
10.4. Common ClockBuilderProWork Flow Scenarios
There are three common workflow scenarios when using CBPro and the Si5342 EVB. These workflow scenarios
are:
Workflow Scenario #1: Testing a Silicon Labs-Created Default Configuration
Workflow Scenario #2: Modifying the Default Silicon Labs-Created Device Configuration
Workflow Scenario #3: Testing a User-Created Device Configuration
Each is described in more detail in the following sections.
10.5. Workflow Scenario #1: Testing a Silicon Labs-Created Default Configuration
The flow for using the EVB GUI to initialize and control a device on the EVB is as follows.
Once the PC and EVB are connected, launch ClockBuilder Pro by clicking on this icon on your PC’s desktop.
Figure 10. ClockBuilderPro Desktop Icon
If an EVB is detected, click on the “Open Default Plan” button on the Wizard’s main menu. CBPro automatically
detects the EVB and device type.
Figure 11. Open Default Plan
Once you open the default plan (based on your EVB model number), a popup will appear.
Figure 12. Write Design to EVB Dialog
Select “Yes” to write the default plan to the Si5342 device mounted on your EVB. This ensures the device is
completely reconfigured per the Silicon Labs default plan for the DUT type mounted on the EVB.
Figure 13. Writing Design Status
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