Silicon Laboratories Si5341-EVB User manual

Rev. 1.1 5/15 Copyright © 2015 by Silicon Labs Si5341-EVB
Si5341-EVB
Si5341 EVALUATION BOARD USER’SGUIDE
Description
The Si5341-EVB is used for evaluating the Si5341 Low
Jitter Any-Frequency Clock Generator. The Si5341 uses
the patented Multisynthtechnology to generate up to
10 independent clock frequencies each with 0 ppm
synthesis error. The Si5341-EVB has 3 independent
input clocks, an optional feedback input clock for zero
delay mode, and 10 independent output clocks. The
Si5341-EVB can be controlled and configured using the
Clock Builder Pro(CB Pro) software tool.
EVB Features
Powered from USB port or external power supply.
Onboard 48 MHz XTAL allows free-run mode of
operation on the Si5341 or up to 3 input clocks for
synchronous clocking.
Feedback clock input for optional zero delay mode.
CBProGUI programmable VDD supply allows
device to operate from 3.3, 2.5, or 1.8 V.
CBPro GUI programmable VDDO supplies allow each
of the 10 outputs to have its own power supply
voltage selectable from 3.3, 2.5, or 1.8 V.
CBPro GUI-controlled voltage, current, and power
measurements of VDD and all VDDO supplies.
Status LEDs for power supplies and control/status
signals of Si5341.
SMA connectors for input and output clocks.
Figure 1. Si5341 Evaluation Board

Si5341-EVB
2 Rev. 1.1
1. Functional Block Diagram
Below is a functional block diagram of the Si5341-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 “8. Installing
ClockBuilderPro (CBPro) Desktop Software” for more information.
Figure 2. Si5341-EVB Functional Block Diagram

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Rev. 1.1 3
2. Si5341-EVB Support Documentation and ClockBuilderProSoftware
All Si5341 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 ClockBuilderPro desktop software from http://www.silabs.com/CBPro.
2. Connect a USB cable from Si5341-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 ClockBuilderPro to create, download, and run a frequency plan on the Si5341-EVB.
5. For the Si5341 data sheet, go to http://www.silabs.com/timing.
4. Jumper Defaults
Refer to the Si5341 EVB schematics for the functionality associated with each jumper.
Si5341 EVB Jumper Defaults
Location Type I = Installed
0 = Open Location Type I = Installed 0 = Open
JP1 2pin O JP23 2pin O
JP2 2pin I JP24 2pin O
JP3 2pin O JP25 2pin O
JP4 2pin I JP26 2pin O
JP5 2pin I JP27 2pin O
JP6 2pin I JP28 2pin O
JP7 2pin I JP29 2pin O
JP8 2pin I JP30 2pin O
JP9 2pin O JP31 2pin O
JP10 2pin I JP32 2pin O
JP13 2pin O JP33 2pin O
JP14 2pin I JP34 2pin O
JP15 3pin 1to2JP35 2pin O
JP16 3pin 1to2JP36 2pin O
JP17 2pin O JP38 3pin allopen
JP18 2pin O JP39 2pin O
JP19 2pin O JP40 2pin O
JP20 2pin O JP41 2pin O
JP21 2pin O
JP22 2pin O J36 5x2Hdr All5installed

Si5341-EVB
4 Rev. 1.1
5. Status LEDs
D27, D22, and D26 are illuminated when USB +5 V, Si5341 +3.3 V, and Si5341 VDD supply voltages, respectively,
are present. D25, D21, and D24 are status LEDs showing on-board MCU activity.
Figure 3. Status LEDs
Si5341EVBStatusLEDs
Location Silkscreen Color StatusFunctionIndication
D27 5VUSBMAIN Blue Main USB +5V present
D22 3P3V Blue DUT +3.3 V is present
D26 VDD DUT Blue DUT VDD voltage present
D25 INTR Red MCU INTR (Interrupt) active
D21 READY Green MCU Ready
D24 BUSY Green MCU Busy

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6. Clock Input Circuits (INx/INxB and FB_IN/FB_INB)
The Si5341-EVB has eight SMA connectors (IN0/IN0B–IN2/IN3B and FB_IN/FB_INB) 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 Si5341 data sheet.
Figure 4. Input Clock Termination Circuit
7. Clock Output Circuits (OUTx/OUTxB)
Each of the twenty output drivers (10 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 Si5341-EVB
provides pads for optional output termination resistors and/or low frequency capacitors. Note that components with
schematic “NI” designation are not normally populated on the Si5341-EVB and provide locations on the PCB for
optional DC/AC terminations by the end user.
Figure 5. Output Clock Termination Circuit

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8. 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 ClockBuilderPro can be found at the download link shown above.
Please follow the instructions as indicated.
9. Using the Si5341 EVB
9.1. Connecting the EVB to Your Host PC
Once ClockBuilderPro software is installed, connect to the EVB with a USB cable as shown below.
Figure 6. EVB Connection Diagram

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9.2. 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 Si5341-EVB schematic for details.
The Si5341-EB comes preconfigured with jumpers installed at JP15 and JP16 (pins 1-2 in both cases) in order to
select “USB”. These jumpers, together with the components installed, configure the evaluation board to obtain all
+5 V power solely through the main USB connector at J37. This setup is the default configuration and should
normally be sufficient.
Figure 7 shows the correct installation of the jumper shunts at JP15 and JP16 for default or standard operation.
Figure 7. JP15-JP16 Standard Jumper Shunt Installation
Errata Note:Some early versions of the 64-pin Si534x-EVBs may have the silkscreen text at JP15-JP16 reversed regarding
EXT and USB, i.e., USB EXT instead of EXT USB. Regardless, the correct installation of the jumper shunts for
default or standard operation is on the right hand side as read and viewed in Figure 7.
The general guidelines for single USB power supply operation are listed below:
Use either a USB 3.0 or USB 2.0 port. These ports are specified to supply 900 mA and 500 mA
respectively at +5 V.
If you are working with a USB 2.0 port and you are current limited, turn off enough DUT output voltage
regulators to drop the total DUT current ≤470 mA. (Note: USB 2.0 ports may supply > 500 mA. Provided
the nominal +5 V drops gracefully by less than 10%, the EVB will still work.)
If you are working with a USB 2.0 and you are current limited and need all output clock drivers enabled,
re-configure the EVB to drive the DUT output voltage regulators from an external +5 V power supply as
follows:
Connect external +5 V power supply to terminal block J33 on the back side of the PCB.
Move the jumper at JP15 from pins 1-2 USB to pins 2-3 EXT.

Si5341-EVB
8 Rev. 1.1
9.3. Overview of ClockBuilderPro Applications
The ClockBuilderPro installer 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 (Si5341)
Control the EVB’s regulators
Monitor voltage, current, power on the EVB

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9.4. Common ClockBuilderPro Work Flow Scenarios
There are three common workflow scenarios when using CBPro and the Si5341 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.
9.5. 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 Si5341 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.

Si5341-EVB
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Figure 13. Writing Design Status
After CBPro writes the default plan to the EVB, click on “Open EVB GUI” as shown below.
Figure 14. Open EVB GUI
The EVB GUI will appear. Note all power supplies will be set to the values defined in the device’s default CBPro
project file created by Silicon Labs, as shown below.
Figure 15. EVB GUI Window

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9.5.1. Verify Free-Run Mode Operation
Assuming no external clocks have been connected to the INPUT CLOCK differential SMA connectors (labeled
“INx/INxB”) located around the perimeter of the EVB, the DUT should now be operating in free-run mode, as the
DUT will be locked to the crystal in this case.
You can run a quick check to determine if the device is powered up and generating output clocks (and consuming
power) by clicking on the Read All button highlighted above and then reviewing the voltage, current and power
readings for each VDDx supply.
Note: Shutting “Off” then “On” of the VDD and VDDA supplies will power-down and reset the DUT. Every time you do
this, to reload the Silicon Labs-created default plan into the DUT’s register space, you must go back to the Wiz-
ard’s main menu and select “Write Design to EVB”:
Figure 16. Write Design to EVB
Failure to do the step above will cause the device to read in a pre-programmed plan from its non-volatile
memory (NVM). However, the plan loaded from the NVM may not be the latest plan recommended by
Silicon Labs for evaluation.
At this point, you should verify the presence and frequencies of the output clocks (running to free-run mode from
the crystal) using appropriate external instrumentation connected to the output clock SMA connectors. To verify the
output clocks are toggling at the correct frequency and signal format, click on View Design Report as highlighted
below.
Figure 17. View Design Report

Si5341-EVB
12 Rev. 1.1
Your configuration’s design report will appear in a new window, as shown below. Compare the observed output
clocks to the frequencies and formats noted in your default project’s Design Report.
Figure 18. Design Report Window
9.5.2. Verify Locked Mode Operation
Assuming you connect the correct input clocks to the EVB (as noted in the Design Report shown above), the DUT
on your EVB will be running in “locked” mode.

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9.6. Workflow Scenario #2: Modifying the Default Silicon Labs-Created Device
Configuration
To modify the “default” configuration using the CBPro Wizard, click on Edit Configuration with Wizard:
Figure 19. Edit Configuration with Wizard
You will now be taken to the Wizard’s step-by-step menus to allow you to change any of the default plan’s
operating configurations.
Figure 20. Design Wizard

Si5341-EVB
14 Rev. 1.1
Note you can click on the icon on the lower left hand corner of the menu to confirm if your frequency plan is valid.
After making your desired changes, you can click on Write to EVB to update the DUT to reconfigure your device
real-time. The Design Write status window will appear each time you make a change.
Figure 21. Writing Design Status
9.7. Workflow Scenario #3: Testing a User-Created Device Configuration
To test a previously created user configuration, open the CBPro Wizard by clicking on the icon on your desktop and
then selecting Open Design Project File.
Figure 22. Open Design Project File

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Locate your CBPro design file (*.slabtimeproj or *.sitproj file).design file in the Windows file browser.
Figure 23. Browse to Project File
Select Yes when the WRITE DESIGN to EVB popup appears:
Figure 24. Write Design to EVB Dialog
The progress bar will be launched. Once the new design project file has been written to the device, verify the
presence and frequencies of your output clocks and other operating configurations using external instrumentation.

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9.8. Exporting the Register Map File for Device Programming by a Host Processor
You can also export your configuration to a file format suitable for in-system programming by selecting Export as
shown below:
Figure 25. Export Register Map File
You can now write your device’s complete configuration to file formats suitable for in-system programming.
Figure 26. Export Settings

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10. Writing a New Frequency Plan or Device Configuration to Non-Volatile
Memory (OTP)
Note: Writing to the device non-volatile memory (OTP) is NOT the same as writing a configuration into the Si5341 using Clock-
BuilderPro on the Si5341 EVB. Writing a configuration into the EVB from ClockBuilderPro is done using Si5341 RAM
space and can be done virtually unlimited numbers of times. Writing to OTP is limited as described below.
Refer to the Si534x/8x Family Reference Manuals and device data sheets for information on how to write a
configuration to the EVB DUT’s non-volatile memory (OTP). The OTP can be programmed a maximum of two
times only. Care must be taken to ensure the configuration desired is valid when choosing to write to OTP.
11. Si5341-EVB Schematic and Bill of Materials (BOM)
The Si5341 EVB Schematic and Bill of Materials (BOM) can be found online at
http://www.silabs.com/products/clocksoscillators/pages/si538x-4x-evb.aspx
Note: Please be aware that the Si5341-EVB schematic is in OrCad Capture hierarchical format and not in a typical “flat” sche-
matic format.

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