JULY 13, 2016
3
VERSACLOCK
®
3S - 5P35021 Evaluation Board
Board Power Supply
Power Supply Options
The core voltage includes a digital voltage VDD33 and an analog voltage VDDA. Both core voltages can be powered by an
external bench power supply or by USB.
•
Bench Power Supply
– To supply VDD33 with a bench power supply, connect power to J17. To supply VDDA with a bench
power supply, connect power to J18. At the same time, place the jumpers as shown in
Figure 2
B.
•
USB Power Supply
– When the board is connected to a PC through a USB cable, on-board voltage regulators will generate
a 3.3V for the device. In this case, place the jumper as shown in
Figure 2
A. See JP5 jumper position for the on-board voltage
regulators in the following figure. USB power source is recommended because it's readily available right from your laptop.
Figure 2. Jumping to the Pin configuration as shown (Figure 2A.) will select power source from on-board
voltage regulators powered by USB; Jumping to the Pin configuration as shown (Figure 2B.) will
select the bench power supply
Output Clock Voltages
Like VDDA and VDD33 having two sources, each output voltage is also provided with two sources to choose from: bench power
supply or powered from USB. The selection is made by a 4-way header as shown in
Figure 3
below.
The jumper can be used to select a voltage for E1, E2, E3, E4, and E5 respectively. The on-board voltage regulators powered
by USB are 1.8V, 2.5V and 3.3V; VDDOJ is from bench power supply connecting to JP17 and JP18. Each output voltage can
be individually selected. Use the label on the evaluation board: E1 for VDDDIFF1, E2 for VDDSE1, E3 for VDDDIFF2, E4 for
VDDSE2 and E5 for VDDSE3. The JP6 on the EVB needs to be in the default position as supplied by the manufacturer.
Note
: Connect the USB to the board when using external power supply
Figure 3. Jumper Configuration for On-board Voltage Regulators
Figure 2A. (JP5: Pin 1 - 2 to Voltage Regulators)
Figure 2B. (JP5: Pin 2 - 3 to Banana Jack)