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Step 2: Device Programming
Note: Skip this section if device has already been programmed
1. Download and install Clock Cruiser GUI Software to a computer that meets or exceeds minimum requirements found
on Clock Cruiser User guide.
2. Connect the evaluation kit to an USB port using included USB cable. A LED next to the USB connector will glow
red, indicating that +5 V supply has been applied to EVB.
3. Run the Clock Cruiser GUI software. A blue LED (D9) will light up when a connection is established, this LED will
blink periodically as activity is being conducted.
4. Follow the Clock Cruiser User Guide for detailed instructions on navigating through the program to properly
configure device.
5. In the device programming screen, a table indicates the summary of configurations that were selected. Verify that the
Hardware Connected indicator is green and that there is no error in the log.
6. Set appropriate device VDD/VDDO levels.
a. Set VDD and VDDO for each output by using the four rotary switches (U11, U12, U13, and U14) located on the main
board to match device configuration. Make sure that VDDO’s are less than or equal to VDD. The following table shows
which on−board LDO voltage is selected depending on the switch position (see table below).
Rotary Switch
Line
Voltage for Each Switch Position
1
2
3
4
U11
VDD
+3.3 V
+2.5 V
+1.8 V
external source
U12
VDDO0
VDD
U13
VDDO1
U14
VDDO2
7. Program the device permanently by selected [Program OTP Memory] or write to device registers by clicking [Write
to Registers]. In the case Write to Register function is utilized, powering down evaluation kit (i.e. unplugging USB
cable) will reset device registers.
Step 3: Device Evaluation
Select Input Clock
Depending on the programmed configuration, select one of the following input clock references.
1. Crystal (XTAL): The evaluation kit comes equipped with a 25 MHz fundamental crystal on the daughter board. If a
different frequency is required, place new crystal in holder. Device can accept 3 MHz to 50 MHz crystal references.
Please follow the additional step below to properly use Crystal as input reference:
a. Place SW1 on daughter board in the OFF position.
2. External Clock Reference: To use an external clock reference, connect external clock to SMA connector J31 on the
main board. Device can accept 3 MHz to 200 MHz clock references, reference device datasheet for appropriate input
levels.
Please follow additional steps below to properly use an external clock input source:
a. Close out GUI software to stop communication between GUI and EVB.
b. Unplug and Re−plug EVB to USB port.
c. Manually supply power to device with PD# pin. (See section Controlling the Device (GPIO pins) for proper use of
PD# pin)
Note: External Clock can only be used with devices that have been OTP’d.
