Silicon Laboratories Si5397 Series User manual

UG353: Si5397 Evaluation Board User's
Guide
The Si5397-EVB is used for evaluating the Si5397 Any-Frequency, Any-Output, Jitter-
Attenuating Clock Any-Frequency, Any-Output, Jitter-Attenuating Clock Multiplier Revi-
sion A. 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
"SI5397A-A-EB" indicates the evaluation board has been assembled with an Si5397 de-
vice, 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 document, the
terms are synonymous in context.)
KEY FEATURES
• Powered from USB port or external +5 V
power supply via screw terminals
•Onboard 48 MHz XTAL allows standalone
or holdover mode of operation on the
Si5397
• CBPro™ GUI programmable VDD supply
allows device supply voltages of 3.3, 2.5,
or 1.8 V
• CBPro GUI programmable VDDO supplies
allow each of the eight outputs to have its
own supply voltage selectable from 3.3,
2.5, or 1.8 V
• CBPro GUI allows control and
measurement of voltage, current, and
power of VDD and all eight VDDO supplies
• Status LEDs for power supplies and
control/status signals of the Si5397
• SMA connectors for input clocks, output
clocks and optional external timing
reference clock
silabs.com | Building a more connected world. Rev. 0.1

1. Functional Block Diagram
Below is a functional block diagram of the Si5397-A-EB. 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 ClockBuilderPro Applications for more information.
Si5397
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
Output
Termination
XAXB
Crystal / Term
Input
Termination
Input
Termination
Input
Termination
XA
XB
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 0
}Output Clock 1
}Output Clock 2
}Output Clock 3
}Output Clock 4
}Output Clock 5
}Output Clock 6
}Output Clock 7
Power only
Power only
Control/
Status
INTR
Alarm_Status
Input
Termination
CLKIN_3
CLKIN_3B
Input Clock 3 {
CLKOUT_0
CLKOUT_0B
CLKOUT_7
CLKOUT_7B
Optional External
XAXB Ref Input {
Figure 1.1. Si5397-A-EB Functional Block Diagram
UG353: Si5397 Evaluation Board User's Guide
Functional Block Diagram
silabs.com | Building a more connected world. Rev. 0.1 | 2

2. Si5397-A-EVB Support Documentation and ClockBuilderPro™ Software
All Si5397-A-EVB schematics, BOMs, User’s Guides, and software can be found online at: http://www.silabs.com/products/clocksoscil-
lators/pages/si539x-evb.aspx.
UG353: Si5397 Evaluation Board User's Guide
Si5397-A-EVB Support Documentation and ClockBuilderPro™ Software
silabs.com | Building a more connected world. Rev. 0.1 | 3

3. Quick Start
1. Install the ClockBuilderPro desktop software from http://www.silabs.com/CBPro.
2. Connect a USB cable from the Si5397-A-EB 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 Si5397-A-EB.
5. For the Si5397 data sheet, go to http://www.silabs.com/timing.
UG353: Si5397 Evaluation Board User's Guide
Quick Start
silabs.com | Building a more connected world. Rev. 0.1 | 4

4. Jumper Defaults
Table 4.1. Si5397-EB Jumper Defaults1
Location Type I= Installed
0 = Open Location Type I = Installed 0 = Open
JP1 2-pin I JP23 2-pin O
JP2 2-pin O JP24 2-pin O
JP3 2-pin I JP25 2-pin O
JP4 2-pin I JP26 2-pin O
JP5 2-pin O JP27 2-pin O
JP6 2-pin O 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 all open 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 I
JP20 2-pin O JP41 2-pin I
JP21 2-pin O J36 5 x 2 Hdr All 5 installed
JP22 2-pin O
Note:
1. Refer to the Si5397-A-EB schematics for the functionality associated with each jumper.
UG353: Si5397 Evaluation Board User's Guide
Jumper Defaults
silabs.com | Building a more connected world. Rev. 0.1 | 5

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
D2 LOS_XAXB_B Blue Loss of Signal at XAXB input
D5 LOL_AB Blue Lossof Lock - DSPLL A
D6 LOL_BB Blue Lossof Lock - DSPLL B
D8 LOL_CB Blue Lossof Lock - DSPLL C
D11 INTRB Blue Si5397 Interrupt Active
D12 LOL_DB Blue Loss of Lock _ DSPLL D
D27, D22, and D26 are illuminated when USB +5 V, Si5397 +3.3 V, and Si5397 Vcore supply voltages, respectively, are present. D25,
D21, and D24 are status LEDs showing onboard MCU activity. D2 indicates loss of signal at XAXB input (either crystal osc or external
reference). D5, D6, D8, D12 indicate loss of lock for one of four internal DSPLLs (A–D). D11 indicates the Si5397 interrupt output is
active (as configured by Si5397 register programming). LED locations are highlighted below with LED function name indicated on board
silkscreen.
Figure 5.1. Status LEDs
UG353: Si5397 Evaluation Board User's Guide
Status LEDs
silabs.com | Building a more connected world. Rev. 0.1 | 6

6. External Reference Input (XA/XB)
An external timing reference (48 MHz 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 Si5397-A-EB can also accommodate
an external reference clock instead of a crystal.To evaluate the device with an external REFCLK, C111 and C113 must be populated
and XTAL Y1 removed (see figure below). The REFCLK can then be applied to SMA connectors J39 and J40.
Figure 6.1. External Reference Input Circuit
UG353: Si5397 Evaluation Board User's Guide
External Reference Input (XA/XB)
silabs.com | Building a more connected world. Rev. 0.1 | 7

7. Clock Input Circuits (INx/INxB)
The Si5397-A-EB 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, please refer to the Si5397 data sheet.
Figure 7.1. Input Clock Termination Circuit
UG353: Si5397 Evaluation Board User's Guide
Clock Input Circuits (INx/INxB)
silabs.com | Building a more connected world. Rev. 0.1 | 8

8. Clock Output Circuits (OUTx/OUTxB)
Each of the sixteen output drivers (eight differential pairs, OUT0/OUT0B—OUT7/OUT7B) is ac-coupled to its respective SMA connec-
tor. The output clock termination circuit is shown below. The output signal will have no dc bias. If dc coupling is required, the ac cou-
pling capacitors can be replaced with a resistor of appropriate value. The Si5397-A-EB provides pads for optional output termination
resistors and/or low-frequency capacitors. Note that components with a schematic “NI” designation are not normally populated on the
Si5397-A-EB and provide locations on the PCB for optional dc/ac terminations by the end user.
Figure 8.1. Output Clock Termination Circuit
UG353: Si5397 Evaluation Board User's Guide
Clock Output Circuits (OUTx/OUTxB)
silabs.com | Building a more connected world. Rev. 0.1 | 9

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 the ClockBuilder-
Pro software.
Installation instructions and User’s Guide for ClockBuilderPro can be found at the download link shown above.
UG353: Si5397 Evaluation Board User's Guide
Installing ClockBuilderPro (CBPro) Desktop Software
silabs.com | Building a more connected world. Rev. 0.1 | 10

10. Using the Si5397-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 in the figure below:
Figure 10.1. EVB Connection Diagram
UG353: Si5397 Evaluation Board User's Guide
Using the Si5397-EVB
silabs.com | Building a more connected world. Rev. 0.1 | 11

10.2 Additional Power Supplies
The Si5397-A-EB comes preconfigured with jumpers installed at JP15 and JP16 (pins1–2 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
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 ClockBuilderPro Applications
Note: The following instructions and screen captures may vary slightly depending on your version of ClockBuilder Pro. The ClockBuil-
derPro™ installer will install two main applications:
UG353: Si5397 Evaluation Board User's Guide
Using the Si5397-EVB
silabs.com | Building a more connected world. Rev. 0.1 | 12

Figure 10.3. Application #1: ClockBuilder ProWizard
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 (Si5397)
• Control the EVB’s regulators
• Monitor voltage, current, and power on the EVB
UG353: Si5397 Evaluation Board User's Guide
Using the Si5397-EVB
silabs.com | Building a more connected world. Rev. 0.1 | 13

10.4 Common ClockBuilderPro Workflow Scenarios
There are three common workflow scenarios when using CBPro and the Si5397-A-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 ClockBuilderPro by clicking this icon on your PC’s desktop:
Figure 10.5. 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 10.6. Open Default Plan
UG353: Si5397 Evaluation Board User's Guide
Using the Si5397-EVB
silabs.com | Building a more connected world. Rev. 0.1 | 14

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:
UG353: Si5397 Evaluation Board User's Guide
Using the Si5397-EVB
silabs.com | Building a more connected world. Rev. 0.1 | 15

Figure 10.10. EVB GUI Window
UG353: Si5397 Evaluation Board User's Guide
Using the Si5397-EVB
silabs.com | Building a more connected world. Rev. 0.1 | 16

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 Read All button highlighted above and then reviewing the voltage, current, and power readings for each VDDx supply.
Note: Shutting the VDD and VDDA supplies “Off” then “On” 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 Wizard’s main menu and select “Write Design
to EVB” 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 the output clocks are toggling at the correct
frequency and signal format, click on View Design Report as highlighted below.
UG353: Si5397 Evaluation Board User's Guide
Using the Si5397-EVB
silabs.com | Building a more connected world. Rev. 0.1 | 17

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.
UG353: Si5397 Evaluation Board User's Guide
Using the Si5397-EVB
silabs.com | Building a more connected world. Rev. 0.1 | 18

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 be
running in “locked” mode.
UG353: Si5397 Evaluation Board User's Guide
Using the Si5397-EVB
silabs.com | Building a more connected world. Rev. 0.1 | 19

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.
UG353: Si5397 Evaluation Board User's Guide
Using the Si5397-EVB
silabs.com | Building a more connected world. Rev. 0.1 | 20