Power Setup - Lattice Semiconductor XP2 Advanced User Manual

Lattice Semiconductor
LatticeXP2 Device
This board features a LatticeXP2 FPGA with a 1.2V DC core in a 484-ball fpBGA package. The default device is
the LatticeXP2-17. Any other LatticeXP2 density in this package can be accommodated. A complete description of
this device can be found on the Lattice web site at www.latticesemi.com.

Power Setup

The board is supplied by a single 5.0V to 28.0V DC power supply. On-board regulators will provide the necessary
supply voltages. The on-board regulators supply 3.3V, 2.5V, 1.8V, 1.2V, and an adjustable voltage (VCC_ADJ). The
adjustable voltage is set by the potentiometer VR1 and can be set to a value between 1.22V and 3.25V. The DC
power may be applied through the power jack at J54 using an AC adapter with a 5.0V to 28.0V DC output range.
Requirements for the power jack are listed in Table 1. The on/off switch (SW9) can be used as a convenience to
disable power jack J54. Be sure that SW9 is in the "on" position for normal operation.
The DC power may also be applied using a workbench power supply through the banana jacks at J53 (VCC_IN)
and J51 (GND). The workbench power supply voltage has to be between 5.0V and 28.0V.
Table 1. Power Jack J54 Specifications
Power may also be supplied directly for each individual supply rail using banana jack connectors. To enable this
mode of operation, the appropriate fuses must be removed. All power sources must be regulated to the specifica-
tions in Table 2. No special power sequencing is required for the evaluation board.
Table 2. Individual Control of Supplies
Supply
VCC_ADJ
Power Voltage Monitoring
A Lattice's ispPAC Power Manager II device, ispPAC-POWR1220AT8, is used for monitoring various voltages on
the board. There are six LEDs used to indicate the status of the monitoring voltages. If the monitoring voltage is not
in the +/- 5% voltage window, the corresponding LED will be flashing, otherwise the LED will stay ON. Table 3
shows these six voltages and the corresponding LEDs.
Table 3. Individual Monitoring of Six Power Voltages
Polarity
Inside Diameter
Outside Diameter
Current Capacity
Jack
3.3V J50
2.5V J41
1.8V J47
1.2V J48
J46
Voltage LED
3.3V D5
2.5V D6
1.8V D7
1.2V D8
Vref D9
Vtt D10
Evaluation Board User's Guide
Positive Center
0.1" (2.5mm)
0.218" (5.5mm)
Up to 4A
Fuse
F5 (3.0A)
F1 (3.0A)
F3 (10.0A)
F4 (3.0A)
F2 (1.5A)
Monitoring Voltage Range
3.3V +/- 5%
2.5V +/- 5%
1.8V +/- 5%
1.2V +/- 5%
0.9V +/- 5%
0.9V +/- 5%
5
LatticeXP2 Advanced
Requirement
+/- 5%
+/- 5%
+/- 5%
+/- 5%
User-defined