NuMaker-LoRaD470/868/915-M252
Dec. 21, 2020
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3.5.2
5 V Power Sources
Table 3-6 presents the 5 V power sources.
Connector
Net Name in
Schematic
Description
ICEJ3
USB_HS_VBUS
ICE USB connector supplies 5 V power from PC to
M252 target board and Nu-Link2-Me.
J2
USB_VBUS
USB connector on NuMaker-LoRaD-M252 supplies 5 V
power from PC to M252 target board and Nu-Link2-Me.
NU1 pin5
NU1_5VCC
ICEJ3, J2 or NU1 pin8 supplies 5 V power to NU1 pin5.
NU1 pin5 supplies 5 V power to target chip or Arduino
adapter board.
Note:
LoRa module operating voltage range is from 1.8
V to 3.6 V. Do not switch SW2.1 (NU1 5VCC) to ON.
Table 3-6 5 V Power Sources
3.5.3
3.3 V Power Sources
Table 3-7 presents the 3.3 V power sources.
Voltage
Regulator
5 V Source
Description
ICEUP1
USB_HS_VBUS
ICEUP1 converts USB_HS_VBUS to 3.3 V and
supplies 3.3 V to M252 target board or ICE chip.
UP1
USB_VBUS
UP1 converts USB_VBUS to 3.3 V and supplies 3.3 V
to M252 target board.
Note:
SW2.2 (NU1 3VCC) should be switched to ON.
UP1
NU1_5VCC
UP1 converts NU1_5VCC to 3.3 V and supplies 3.3 V
to M252 target board.
Note:
SW2.2 (NU1 3VCC) should be switched to ON.
Table 3-7 3.3 V Power Sources
3.5.4
1.8 V Power Sources
Table 3-8 presents the 1.8 V power source.
Voltage Regular
5V Source
Description
ICEUP2
USB_HS_VBUS
ICEUP2 converts USB_HS_VBUS to 1.8 V and
supplies 1.8 V to M252 target board or ICE chip.
Table 3-8 1.8 V Power Sources
