NuMaker-LoRaD470/868/915-M252
Dec. 21, 2020
Page
21
of 31
Rev 1.00
N
UMA
K
E
R
-L
O
RA
D
47
0/8
6
8/9
1
5
-M2
5
2
U
S
E
R
M
A
NU
A
L
Ma
k
er Nu
-m
be
d
NUC
47
2
Us
er Man
ua
l
USB Power Connector (J2)
NU1 pin8 (Vin)
External V
DD
Connector (JP1)
External V
SS
Connector (JP2)
Separate Nu-Link2-Me
"
"
NuMaker-RoLaD-M252 V1.1
Figure 3-7 Detach the Nu-Link2-Me from NuMaker-LoRaD-M252
Table 3-13 presents all power models when supplies external power through M252 target board. The
M252 target board external power sources are highlighted in yellow.
Model
Target Chip
Voltage
Vin
[1]
J2
[1]
ICEJ3
SW2
Selection
JP1
[2]
ICEJPR1
(MCUVCC)
Selection
[3]
ICEJPR2
(ICEVCC)
Selection
[4]
ICE Chip
Voltage
[5]
3
3.3 V
7 V ~ 12 V
Input
-
-
NU1
3VCC
3.3 V output
Remove
resistor
3.3 V
3.3 V
4
3.3 V
-
Connect
to PC
-
NU1
3VCC
3.3 V output
Remove
resistor
3.3 V
3.3 V
5
1.8 V ~ 3.6 V
-
-
Connect to
PC
OFF
DC Input
1.8 V ~ 3.6 V
Remove
resistor
1.8 V / 3.3 V 1.8 V / 3.3 V
6
1.8 V ~ 3.6 V
-
-
Nu-Link2-Me
removed
OFF
DC Input
1.8 V ~ 3.6 V
-
-
-
Note
:
1. The Vin input voltage will be converted by voltage regulator UP2 to 5 V. Supplying external power to Vin or J2 can
provide 5 V to NU1 pin5 (5V) and 3.3 V to NU1 pin4 (3VCC).
2. JP1 external power input only provides voltage to target chip.
3. 0
Ω should be removed from ICEJPR1’s MCUVCC and 1.8 V / 3.3 V / 5 V.
4. 0
Ω should be soldered between ICEJPR2’s ICEVCC and 1.8 V / 3.3 V.
5. The ICE chip voltage should be close to the target chip voltage.
6. -: Unused
Table 3-13 Supply External Power for M252 Target Board
