Silicon Laboratories Si5345-EVB Manual de usuario

Si5345-EVB

Si5345 EVALUATION BOARD USER’SGUIDE

Description

The Si5345-EVB is used for evaluating the Si5345

Any-Frequency, Any-Output, Jitter-Attenuating Clock

Multiplier. The Si5345 combines 4th generation DSPLL

and Multisynthtechnologies to enable any-frequency

clock generation for applications that required the

highest level of jitter performance. The Si5345-EVB has

4 independent input clocks and 10 independent output

clocks. The Si5345-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 or Reference SMA Inputs

allow holdover mode of operation on the Si5345.

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 Si5345.

SMA connectors for input clocks, output clocks, and

optional external timing reference clock.

Figure 1. Si5345 Evaluation Board

Si5345-EVB

2 Rev. 1.1

1. Functional Block Diagram

Below is a functional block diagram of the Si5345-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 “10.3. Overview of

ClockBuilderPro Applications” for more information.

Figure 2. Si5345-EVB Functional Block Diagram

Si5345-EVB

Rev. 1.1 3

2. Si5345-EVB Support Documentation and ClockBuilderProSoftware

All Si5345 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 Si5345-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 Si5345-EVB.

5. For the Si5345 data sheet, go to http://www.silabs.com/timing.

4. Jumper Defaults

Refer to the Si5345 EVB schematics for the functionality associated with each jumper.

Si5345 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 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

JP22 2 pin O J36 5x2 Hdr All 5 installed

Si5345-EVB

4 Rev. 1.1

5. Status LEDs

D27, D22, and D26 are illuminated when USB +5 V, Si5345 +3.3 V, and Si5345 VDD supply voltages, respectively,

are present. D25, D21, and D24 are status LEDs showing on-board MCU activity.

Figure 3. Status LEDs

Si5345 EVB 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

Si5345-EVB

Rev. 1.1 5

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 for providing a stable reference for the free-run and holdover modes. The

Si5345-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 Figure 4 below). The REFCLK can then

be supplied to J39 and J40.

Figure 4. External Reference Input Circuit

Si5345-EVB

6 Rev. 1.1

7. Clock Input Circuits (INx/INxB)

The Si5345-EVB has eight SMA connectors (IN0, IN0B–IN3, IN3B) for receiving external clock signals. All input

clocks are terminated as shown in Figure 5 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 Si5345 data sheet.

Figure 5. Input Clock Termination Circuit

8. 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 6 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 Si5345-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 Si5345-EVB and provide locations on the PCB for

optional DC/AC terminations by the end user.

Figure 6. Output Clock Termination Circuit

Si5345-EVB

Rev. 1.1 7

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 ClockBuilderPro can be found at the download link shown above.

Please follow the instructions as indicated.

10. Using the Si5345 EVB

10.1. Connecting the EVB to Your Host PC

Once ClockBuilderPro software is installed, connect to the EVB with a USB cable as shown below.

Figure 7. EVB Connection Diagram

Si5345-EVB

8 Rev. 1.1

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 Si5345-EVB schematic for details.

The Si5345-EB comes pre-configured 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 8 shows the correct installation of the jumper shunts at JP15 and JP16 for default or standard operation.

Figure 8. 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 8.

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.

Si5345-EVB

Rev. 1.1 9

10.3. Overview of ClockBuilderProApplications

The ClockBuilderPro installer will install two main applications:

Figure 9. 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 10. Application #2: EVB GUI

Use the EVB GUI to:

Download configuration to EVB’s DUT (Si5345)

Control the EVB’s regulators

Monitor voltage, current, power on the EVB

Si5345-EVB

10 Rev. 1.1

10.4. Common ClockBuilderProWork Flow Scenarios

There are three common workflow scenarios when using CBPro and the Si5345 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 11. 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 12. Open Default Plan

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

Figure 13. Write Design to EVB Dialog

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