Applying Power To The Board; Figure 2.1. Board Power Supply - Lattice Semiconductor MachXO5T-NX-Development Board User Manual

MachXO5T-NX-Development Board
Evaluation Board User Guide

2. Applying Power to the Board

The MachXO5T-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 or the PCIe edge connector CN1, which is fused with a surface mounted fuse U10. The
5A fuse prevents the crashed current from flowing into the internal circuits and cause serious damage, as shown in
Figure 2.1.
12V DC
Power Jack
(J17)
12V_IN_PICE
Fuse (U10)
+12V
5V Regulator
(U11)
PS_5V
Slide Switch
(SW6)
VBUS_5V
USB Header
5V PC1
(J11)
JP15
5V PC2
USB Header
(J19)
The onboard 5 V power regulator U11 provides 90% power convert efficiency from 12 V DC when output current
between 50 mA and 3 A. It is distributed to 3.3 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 take the 5 V DC power from USB header J11
as well to supply those LDOs. For some low power applications, JP15 can be used to double the power supplier
capability, if J19 is also plugged into the same PC that is connected to J11. You need to ensure 5 V DC power consume
less than maximum capability from each USB port of PC when taking power from J11 and J19.
For the board extension, 5 V DC power can also supply Raspberry Pi and Arduino boards through the jumpers and
onboard headers, to consolidate AC/DC adapters for stack boards system. Conversely, 5 V DC power for MachXO5T-NX
Development Board can be supplied either from mated Raspberry Pi or Arduino Boards, if they are powered up by
external AC/DC adapters already. You need to ensure 5 V power from a single source when adding JP6 or JP7 jumpers.
However, maintain 5 V DC supplier is the basic requirement to power on the board, by checking the power good blue
LED D18.
The onboard 1.1 V, 1.2 V, and 1.8 V LDOs take the power from 2.5 V LDO output.
Table 2.1 summarizes onboard major power rails and their test points.
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10
12V PC
PCIe Edge
Connector (CN1)
1.8V LDO
(U15)
+2.5V
2.5V LDO
(U13)
+2.5V
+2.5V
1.2V LDO
(U16)
+5.0V
1.0V Regulator
(U12)
1.1V LDO
(U17)
3.3V LDO
(U8)
JP6
+3.3V_AR
Arduino
Header (J4)
JP7
+3.3V_RASP
Raspberry Pi
Header (J6)

Figure 2.1. Board Power Supply

+1.8V
PHY0 VDDP/PHY1 VDDP (U6/U7)
+1.8V
+1.8V
VCCAUX/VCCAUXA/VCCAUXH/VCCADC/
VCCPLLSD/VCCAUXSDQ (U3)
+1.8V
+1.2V
+2.5V
PMOD0(J15)
+3.3V
Config JTAG (J1)
+1.8V
+1.2V
+3.3V
Reg1 out
PHY1 (U7)
+3.3V
FTDI1 VCCIO (U18)
+1.0V
+3.3V
FTDI0 VCCIO (U1)
+3.3V
PHY0 (U6)
Reg0 out
+1.1V
LPDDR4 VDDQ/
VDD2 (U9)
+3.3V
User JTAG (J18)
+3.3V
PMOD1 (J16)
+3.3V
LPDDR4 VDD1 (U9)
VCCIO5 (U3)
VCCIO1/2 (U3)
VCCIO4(U3)
PHY1 VDD (U7)
VCC Core/VCCSD/
VCCSDCK(U3)
PHY0 VDD (U6)
VCCIO3(U3)
VCCIO0(U3)
VCCIO6(U3)
VCCIO7(U3)
FPGA-EB-02058-1.0