SI5395A-A-EVB - SILICON LABS

UG335: Si5395 Evaluation Board User's

Guide

The Si5395 EVB is used for evaluating the Si5395 Any-Frequency, Any-Output, Jitter-

Attenuating Clock Multiplier. There are two different EVBs for the Si5395. There is a

Grade A and a Grade P board. This user guide is intended for both versions of the

Si5395 EVBS. The device grade and revision is distinguished by a white 1 inch x 0.187

inch label installed in the lower left hand corner of the board. In the example below, the

label "SI5395A-A-EB" indicates the evaluation board has been assembled with an

Si5395 device, Grade A, Revision A, installed. (For ordering purposes only, the terms

“EB” and “EVB” refer to the board and the kit, respectively. For the purpose of this docu-

ment, the terms are synonymous in context.)

KEY FEATURES

• Powered from USB port or external power

supply

•Onboard 48 MHz XTAL or Reference SMA

Inputs allow holdover mode of operation on

the Si5395

•ClockBuilder Pro® (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 Si5395

• SMA connectors for input clocks, output

clocks, and optional external timing

reference clock

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1. Functional Block Diagram

Below is a functional block diagram of the Si5395 EVB. This evaluation board can be connected to a PC via the main USB connector

for programming, control, and monitoring. See 3. Quick Start or 10.3 Overview of ClockBuilder Pro Applications for more information.

Si5395

CLKOUT_0

CLKOUT_0B

Output

Termination

CLKOUT_1

CLKOUT_1B

Output

Termination

CLKOUT_2

CLKOUT_2B

Output

Termination

CLKOUT_3

CLKOUT_3B

Output

Termination

CLKOUT_4

CLKOUT_4B

Output

Termination

CLKOUT_5

CLKOUT_5B

Output

Termination

CLKOUT_6

CLKOUT_6B

Output

Termination

CLKOUT_7

CLKOUT_7B

Output

Termination

48 MHz

XTAL

Input

Termination

Input

Termination

Input

Termination

CLKIN_0

CLKIN_0B

CLKIN_1

CLKIN_1B

CLKIN_2

CLKIN_2B

Power Supply

C8051F380

MCU

Peripherals

I2C/SPI Bus

VDDO_0

VDD_Core

VDD_3.3

VDDO_1

VDDO_2

VDDO_3

VDDO_4

VDDO_5

VDDO_6

VDDO_7

VDDO_0

VDD_Core

VDD_3.3

VDDO_1

VDDO_2

VDDO_3

VDDO_4

VDDO_5

VDDO_6

VDDO_7

Main USB

Connector

Aux USB

Connector

Ext +5V

Connector

I2C/SPI Bus

+5V_USB

+5V_Aux

+5V_Ext

VDDMCU

Input Clock 0 {

Input Clock 1 {

Input Clock 2 {

}Output Clock 0A

}Output Clock 0

}Output Clock 1

}Output Clock 2

}Output Clock 3

}Output Clock 4

}Output Clock 5

}Output Clock 6

Power only

VDDO_8

VDDO_9

VDDO_8

VDDO_9

CLKOUT_8

CLKOUT_8B

Output

Termination }Output Clock 7

CLKOUT_9

CLKOUT_9B

Output

Termination }Output Clock 8

Control/

Status

INTR

Alarm_Status

Input

Termination

CLKIN_3/FB_IN

CLKIN_3/FB_INB

Input Clock 3 {

CLKOUT_9A

CLKOUT_9AB

Output

Termination }Output Clock 9A

Output

Termination }Output Clock 9

CLKOUT_0A

CLKOUT_0AB

VDDO_9A VDDO_9A

VDDO_0A VDDO_0A

Figure 1.1. Si5395 EB Functional Block Diagram

UG335: Si5395 Evaluation Board User's Guide

Functional Block Diagram

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2. Si5395 EVB Support Documentation and ClockBuilderPro Software

All Si5395 EVB schematics, BOMs, User’s Guides, and software can be found online at: http://www.silabs.com/products/clocksoscilla-

tors/pages/si539x-evb.aspx.

UG335: Si5395 Evaluation Board User's Guide

Si5395 EVB Support Documentation and ClockBuilderPro Software

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3. Quick Start

1. Install the ClockBuilder Pro desktop software from http://www.silabs.com/CBPro.

2. Connect a USB cable from Si5395 EVB to the PC where the software was installed.

3. Confirm jumpers are installed as shown in Table 4.1 Si5395 EVB Jumper Defaults1 on page 5.

4. Launch the ClockBuilder Pro Software.

5. You can use ClockBuilder Pro to create, download, and run a frequency plan on the Si5395 EVB.

6. For the Si5395 data sheet, go to http://www.silabs.com/timing.

UG335: Si5395 Evaluation Board User's Guide

Quick Start

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4. Jumper Defaults

Table 4.1. Si5395 EVB Jumper Defaults1

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 O 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 2 JP35 2-pin O

JP16 3-pin 1 to 2 JP36 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 J36 5 x 2 Hdr All 5 installed

JP22 2-pin O

Note:

1. Refer to the Si5395 EVB schematics for the functionality associated with each jumper.

UG335: Si5395 Evaluation Board User's Guide

Jumper Defaults

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5. Status LEDs

Location Silkscreen Color Status Function Indication

D27 5VUSBMAIN Blue Main USB +5 V 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

D27, D22, and D26 are illuminated when USB +5 V, Si5395 +3.3 V, and Si5395 VDD supply voltages, respectively, are present. D25,

D21, and D24 are status LEDs showing on-board MCU activity.

Figure 5.1. Status LEDs

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Status LEDs

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6. External Reference Input (XA/XB)

An external reference (XTAL) is used in combination with the internal oscillator to produce an ultra-low-jitter reference clock for the

DSPLL and to provide a stable reference for the free-run and holdover modes. The Si5395 EVB can also accommodate an external

reference clock instead of a crystal. To evaluate the device with a REFCLK, C111 and C113 must be populated and the XTAL removed

(see the figure below). Also, R197 and R202 must be populated. The REFCLK can then be supplied to J39 and J40. In the case of the

Si5395J-A, which is the grade with the xtal internal to the device, there will be no external xtal supplied on the board and no input from

Ref_XA and Ref_XB. In this case, it is advised to remove R197 and R202.

Figure 6.1. External Reference Input Circuit

UG335: Si5395 Evaluation Board User's Guide

External Reference Input (XA/XB)

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7. Clock Input Circuits (INx/INxB)

The Si5395 EVB has eight SMA connectors (IN0, IN0B – IN3, IN3B) for receiving external clock signals. All input clocks are terminated

as shown below. Note that input clocks are ac-coupled and 50 Ω terminated. This represents four 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 con-

figure inputs as single-ended, refer to the Si5395 data sheet.

Figure 7.1. Input Clock Termination Circuit

UG335: Si5395 Evaluation Board User's Guide

Clock Input Circuits (INx/INxB)

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8. Clock Output Circuits (OUTx/OUTxB)

Each of the twenty-four output drivers (12 differential pairs) is ac-coupled to its respective SMA connector. The output clock termination

circuit is shown 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 Si5395 EVB provides pads for optional output termination resistors and/or low-frequency capacitors.

Note that components with the schematic “NI” designation are not normally populated on the Si5395 EVB and provide locations on the

PCB for optional dc/ac terminations by the end user.

Figure 8.1. Output Clock Termination Circuit

UG335: Si5395 Evaluation Board User's Guide

Clock Output Circuits (OUTx/OUTxB)

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9. Installing ClockBuilderPro Desktop Software

To install the CBOPro software on any Windows 7 (or above) PC, go to http://www.silabs.com/CBPro and download the ClockBuilder

Pro software.

Installation instructions and User’s Guide for ClockBuilder Pro can be found at the download link shown above.

UG335: Si5395 Evaluation Board User's Guide

Installing ClockBuilderPro Desktop Software

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10. Using the Si5395 EVB

10.1 Connecting the EVB to Your Host PC

Once ClockBuilder Pro software is installed, connect to the EVB with a USB cable as shown in the figure below:

Figure 10.1. EVB Connection Diagram

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Using the Si5395 EVB

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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 connec-

tor). Refer to the Si5395 EVB schematic for details.

The Si5395 EVB 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.

The following figure shows the correct installation of the jumper shunts at JP15 and JP16 for default or standard operation.

Figure 10.2. JP15–JP16 Standard Jumper Shunt Installation

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 the figure above.

The general guidelines for single USB power supply operation are as follows:

• 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, reconfigure the EVB to drive

the DUT output voltage regulators from an external +5 V power supply as follows:

• Connect an 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.

10.3 Overview of ClockBuilder Pro Applications

Note: The following instructions and screen captures may vary slightly depending on the grade of your device and your version of

ClockBuilder Pro. (The screen captures below were taken for a board labeled "SI5395A-A-EB".) The ClockBuilder Pro installer will in-

stall two main applications:

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Using the Si5395 EVB

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Figure 10.3. Application #1: ClockBuilder Pro Wizard

Use the CBPro wizard to:

•Create a new design

• Review or edit an existing design

• Export: create in-system programming

Figure 10.4. Application #2: EVBGUI

Use the EVB GUI to:

•Download configuration to EVB’s DUT (Si5395)

• Control the EVB’s regulators

• Monitor voltage, current, and power on the EVB

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Using the Si5395 EVB

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10.4 Common ClockBuilder Pro Workflow Scenarios

There are three common workflow scenarios when using CBPro and the Si5395 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 workflow scenario is described in more detail in the following sections.

10.5 Workflow Scenario 1: Testing a Silicon Labs 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 this icon on your PC’s desktop:

Figure 10.5. ClockBuilder Pro 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 10.6. Open Default Plan

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Using the Si5395 EVB

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Once you open the default plan (based on your EVB model number), a popup will appear:

Figure 10.7. Write Design to EVB Dialog

Select “Yes” to write the default plan to the Si5395 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 10.8. Writing Design Status

After CBPro writes the default plan to the EVB, click on “Open EVB GUI” as shown below:

Figure 10.9. Open EVB GUI

The EVB GUI will appear. Note that all power supplies will be set to the values defined in the device’s default CBPro project file created

by Silicon Labs, as shown in the following figure:

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Using the Si5395 EVB

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Figure 10.10. EVB GUI Window

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Using the Si5395 EVB

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10.5.1 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 highlighted "Read All" button and then reviewing the voltage, current, and power readings for each VDDx supply.

Note: Switching the VDD and VDDA supplies “Off” and then “On” will power-down and reset the DUT. Each time this is done, you must

go back to the Wizard’s main menu and select “Write Design to EVB” to reload the Silicon Labs default plan into the DUT’s register

space, as shown below.

Figure 10.11. Write Design to EVB

Failure to perform this step will cause the device to read in a preprogrammed 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 ap-

propriate external instrumentation connected to the output clock SMA connectors. To verify that the output clocks are toggling at the

correct frequency and signal format, click on View Design Report as highlighted below.

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Using the Si5395 EVB

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Figure 10.12. View Design Report

Your configuration’s design report will appear in a new window, as shown below. Compare the observed output clocks to the frequen-

cies and formats noted in your default project’s Design Report.

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Using the Si5395 EVB

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Figure 10.13. Design Report Window

10.5.2 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 run

in “locked” mode.

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Using the Si5395 EVB

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10.6 Workflow Scenario 2: Modifying the Default Silicon Labs-Created Device Configuration

To modify the “default” configuration using the CBPro Wizard, click on the links below under “Edit Configuration with Wizard”.

Figure 10.14. 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.

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Using the Si5395 EVB

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Figure 10.15. Design Wizard

Note that you can click on the icon in the lower left hand corner of the menu to confirm that your frequency plan is valid. After making

your desired changes, click on Write to EVB to update the DUT and reconfigure your device real-time. The Design Write status window

will appear each time you make a change.

Figure 10.16. Writing Design Status

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Using the Si5395 EVB

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10.7 Workflow Scenario 3: Testing a User-Created Device Configuration

To test a previously created user configuration, open the CBPro Wizard by clicking the icon on your desktop and selecting Open Design

Project File.

Figure 10.17. Open Design Project File

Locate your CBPro design file (*.slabtimeproj or *.sitproj file) in the Windows file browser.

Figure 10.18. Browse to Project File

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Using the Si5395 EVB

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Select "Yes" when the WRITE DESIGN to EVB popup appears:

Figure 10.19. 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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Using the Si5395 EVB

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10.8 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 10.20. Export Register Map File

You can now write your device’s complete configuration to file formats suitable for in-system programming:

Figure 10.21. Export Settings

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Using the Si5395 EVB

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11. 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 Si5395 using ClockBuilder

Pro on the Si5395 EVB. Writing a configuration into the EVB from ClockBuilderPro is done using Si5395 RAM space and can be done a

virtually unlimited numbers of times. Writing to OTP is limited as described below.

Refer to the Si5395 Family Reference Manual 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 desired

configuration is valid when choosing to write to OTP.

UG335: Si5395 Evaluation Board User's Guide

Writing a New Frequency Plan or Device Configuration to Non-Volatile Memory (OTP)

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12. Serial Device Communications

12.1 Onboard SPI Support

The MCU onboard the Si5395 EVB communicates with the Si5395 device through a 4-wire SPI (Serial Peripheral Interface) link. The

MCU is the SPI master and the Si5395 device is the SPI slave. The Si5395 device can also support a 2-wire I2C serial interface, al-

though the Si5395 EVB does NOT support the I2C mode of operation. SPI mode was chosen for the EVB because of the relatively

higher speed transfers supported by SPI vs. I2C.

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Serial Device Communications

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13. Si5395 EVB Schematic, Layout, and Bill of Materials (BOM)

The Si5395 EVB Schematic, Layout, and Bill of Materials (BOM) can be found online at: http://www.silabs.com/products/clocksoscilla-

tors/pages/si539x-evb.aspx.

Note: Please be aware that the Si5395 EVB schematic is in OrCad Capture hierarchical format and not in a typical “flat” schematic

format.

This document supports the evaluation board silkscreened Si5395 EVB for the following configurations as described in the table below.

The data sheet documents the different Si5395 grades.

Table 13.1. Evaluation Board Configurations1

Config # Eval Board Label Si5395 Notes

Grade Revision

1 Si5395A-A-EB A A Crystal and related components installed.

2 Si5395P-A-EB P A Crystal and related components installed. Only the DUT and

label differ versus Si5395A-A-EB.

Note:

1. Note that it is not possible to load an Si5395A project onto an Si5395P-A-EB or an Si5395P project onto an Si5395A-A-EB. Use

Si5395A/B/C/D plans for Si5395A-A-EB and Si5395P plans for Si5395P-A-EB.

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Si5395 EVB Schematic, Layout, and Bill of Materials (BOM)

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