NuMaker-M258KG
Jan. 15, 2022
Page
26
of 54
Rev 1.00
N
UMA
K
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-M
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58
KG
US
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R MA
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3.5
External Reference Voltage Connector
Table 3-14 presents the external reference voltage connector.
Connector
Description
VREF1
Connector for user to connect to the external reference voltage pin of the
target chip. User needs to remove the L5 ferrite bead.
Table 3-14 External Reference Voltage Connector
3.6
Battery Voltage (V
BAT
) Connector
Table 3-15 presents the external battery voltage connector.
Connector
Description
V
BAT
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 Connector
3.7
Ammeter Connector
Table 3-16 presents the ammeter connector.
Connector
Description
AMMETER
Connector for user to measure the target chip power consumption easily.
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
3.8
Touch Key
Table 3-17 presents the touch key, shielding electrode and reference pad.