NuMaker-M251KG
Aug.
08, 2020
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23
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Rev 1.00
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External Power Supply through M251 platform to Target Chip
The external power supply sources on M251 platform are shown in Figure 3-6.
USB Power Connector
(J2)
NU1 pin8 (Vin)
External V
DD
Connector
(JP1)
External V
SS
Connector
(JP2)
Figure 3-6 External Power Supply Sources on M251 platform
To use Vin or J2 as external power supply source, please follow the below steps:
1. Switch the SW2 depends on the target chip operating voltage.
2. Remove the resistor on ICEJPR1 (MCUVCC).
3. Solder the resistor on ICEJPR2 (ICEVCC) depends on the ICE chip operating voltage.
4. Connect the external power supply to Vin or J2.
To use JP1 as external power supply source, please follow the below steps:
1. Switch the SW2 to OFF.
2. Remove the resistor on ICEJPR1 (MCUVCC).
3. Solder the resistor on ICEJPR2 (ICEVCC) depends on the ICE chip operating voltage.
4. Connect ICEJ3 to PC.
5. Connect the external power supply to JP1.
To use Vin or J2 as external power supply source with Nu-Link2-Me separated from NuMaker-
M251KG, please follow the below steps:
1. Switch the SW2 depends on the target chip operating voltage.
2. Separate the Nu-Link2-Me from NuMaker-M251KG.
3. Connect the external power supply to Vin or J2.
To use JP1 as external power supply source with Nu-Link2-Me separated from NuMaker-M251KG,
please follow the below steps:
1. Switch the SW2 to OFF.
2. Separate the Nu-Link2-Me from NuMaker-M251KG.
3. Connect the external power supply to JP1.
