NuMaker-M251KG
Aug.
08, 2020
Page
25
of 49
Rev 1.00
NuMa
k
er
-M
25
1
K
G
U
S
E
R
MA
NU
A
L
Ma
k
er Nu
-m
be
d
NUC
47
2
Us
er Man
ua
l
External Reference Voltage Connector
Table 3-13 presents the external reference voltage connector.
Connector
Comment
VREF1
Connector for user to easily connect to the external reference voltage pin
of the target chip. User needs to remove the L5 ferrite bead.
Table 3-13 External Reference Voltage Connector
Voltage Adjustable Interface(VAI) Connector
Table 3-14 presents the voltage adjustable interface connector.
Connector
Comment
VDDIO
Connector for user to easily connect to the V
DDIO
pin of the target chip as
power source of PA.0 ~ PA.5. User needs to remove the R15 resistor.
Table 3-14 Voltage Adjustable Interface Connector
Battery Voltage (V
BAT
) Connector
Table 3-14 presents the battery voltage interface connector.
Connector
Comment
VBAT
Connector for user to easily connect to the V
BAT
pin of the target chip as
power source of PF.4 ~ PF.6, RTC and LXT. User needs to remove the
R17 resistor.
Table 3-15 Battery Voltage Interface Connector
Ammeter Connector
Table 3-16 presents the ammeter connector.
Connector
Comment
AMMETER
Connector for user to easily measure the target chip power consumption.
User needs to remove the R16 resistor.
Table 3-16 Ammeter Connector
Remove the R16
Resistor
Figure 3-8 Wiring between Ammeter Connector and Ammeter
