Lattice Semiconductor MachXO User Manual

Also see for MachXO: User guide

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Lattice Semiconductor MachXO User Manual Manual pdf 4 page image

4MachXO Standard Evaluation BoardLattice Semiconductor Revisions 001 & 002 User’s GuideFigure 1. MachXO Standard Evaluation BoardPower SupplyThe MachXO Standard Evaluation Board includes two locations to apply power. On the east side of the board are apair of banana jacks (JP28 and JP29) and a coaxial DC connector (JP30), which receive power from either a benchpower supply or a brick style power supply. A DC source between 5.0V and 28.0V must be applied in order topower the board. The coaxial DC connector uses a 2.5mm central pin, with a 6.3mm outer diameter barrel.The output from the DC system is controlled by switch S5. Switch S5 is in the southeast corner of the board. This isa small surface mount switch that enables and disables the LTC1775 DC-DC conversion chip. The output voltagesfrom the power supply are enabled when the switch is in the “on” position.The 5.0V to 28.0V DC input voltage is converted by DC-DC converters and switching power supplies to provide3.3V, 1.2V, and an adjustable DC source on the board. The output from these supplies travels through surfacemounted fuse holders. Fuses are supplied and prevent over-current conditions from damaging the components onthe board (Vendor: Littlefuse, Make: Nano SMF Very Fast Acting, 1.5A or 3A).Due west of the fuse blocks are more banana plug connectors. These connectors provide an alternate means forapplying DC voltage levels to the board. To apply voltages not supplied by the on-board power section, firstremove the appropriate fuse from the fuse holder. Then connect an alternate DC supply to the banana plugconnector associated with that fuse.Table 1. Power Supply FusesFuse NumberSupply RailEnabled/DisabledBanana ConnectorInputF1 VADJ JP25F2 1.2V JP26F3 3.3V JP27RJ-45ConnectorAreaSMAConnectorAreaispClock5610DIP Oscillator 8-Bit InputSwitchPush-ButtonSwitchesPrototypeAreasLCD DisplayAreaDC PowerInput JackPowerInputs NorthSouthEastWestPrototypeAreaJTAG ProgrammingInterface