Applying Power To The Board; Figure 2.1. Board Power Supply - Lattice Semiconductor MachXO5-NX User Manual

MachXO5-NX Development Board
Preliminary Evaluation Board User Guide

2. Applying Power to the Board

The MachXO5-NX Development Board comes ready to power up with onboard DC/DC switching regulators and Low
Dropout (LDO) generators powered by an external 12 V DC power source. The external power supply can be connected
with the DC power input jack J17, which is fused with a surface mounted fuse U10. The 1.25A fuse prevents the crashed
current from flowing into the internal circuits and cause serious damage. 12 V DC power also supply Arduino Header J4
and FX12 headers U4/U5 for the board extension, as shown in
12V DC
Power Jack
(J17)
Fuse (U10)
12V
5V Regulator
(U11)
5V
Slide Switch
(SW6)
5V
5V DC
USB Header
(J11)
The onboard 5 V power regulator U11 provide 90% power convert efficiency from 12 V when output current between
50 mA and 3 A. It is distributed to 3.3 V, 2.8 V, 2.5 V LDOs and 1.0 V regulator through one side of slide switch SW6 to
support onboard devices. Through another side of SW6, this board can also take the 5 V power from USB header J11 as
well, for some low power application. It is user's responsibility to ensure all 5 V power rails on board consume less than
500mA per PC's USB port output capability when take power from J11.
For the board extension, 5 V DC power can also supply FX12 adapter, Raspberry Pi and Arduino boards through the
jumpers and onboard headers, to consolidate AC/DC adapters for stack boards system. Conversely, 5V DC power can
be either supplied from mated boards with correct jumper settings. However, maintain the 5 V DC power is the basic
requirement to bring up this board, by quick check the power good blue LED D18.
The onboard 1.2 V and 1.8 V LDOs take the power from 3.3 V and 2.5 V LDO correspondently.
Table 2.1 summarizes onboard major power rails and their test points.
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10
JP6
Arduino
Header(J4)
1.8V LDO
(U15)
2.5V
2.5V LDO
(U13)
5V 1.0V Regulator
(U12)
3.3V LDO (U8)
1.2V
1.2V LDO
(U16)
JP7
Raspberry Pi
Header(J6)
2.8V LDO
(U20)

Figure 2.1. Board Power Supply

Figure 2.1.
12V
5V
FX12 Headers
1.8V
3.3V
1.8V
3.3V
3.3V
1.8V
SMGIIVDDIO(U7)
1.8V
3.3V
2.5V
1.2V
1.0V
2.5V
3.3V
3.3V
1.8V
1.2V
1.8V
1.2V
3.3V
3.3V
2.8V
(U4/U5)
VCCAUX/VCCAUXA/VCCAUX
H/VCCADC (U3)
VCCIO3(U3)
HyperRAM
(U6/U9)
VCCIO9(U3)
PMOD(J28)
VCCIO7(U3)
VCCIO4(U3)
VCC Core(U3)
JTAG(J1)
PMOD(J15)
VCCIO0/2(U3)
VCCIO1(U3)
JTAG(J18)
PMOD(J16)
VCCIO6(U3)
VCCIO5(U3)
VCCIO8(U3)
30-pin
Header(J27)
FPGA-EB-02052-0.90