Nuvoton NuMicro M261 Series User manual

NuMaker-IoT-M263A
Aug 06, 2019 Page 1of 50 Rev 1.00
NUMAKER-IoT-M263A USER MANUAL
Maker Nu-mbed NUC472 User Manual
Arm®Cortex®-M
32-bit Microcontroller
NuMaker-IoT-M263A
User Manual
NuMicro®M261/M262/M263 Series
The information described in this document is the exclusive intellectual property of
Nuvoton Technology Corporation and shall not be reproduced without permission from Nuvoton.
Nuvoton is providing this document only for reference purposes of NuMicro microcontroller based system
design. Nuvoton assumes no responsibility for errors or omissions.
All data and specifications are subject to change without notice.
For additional information or questions, please contact: Nuvoton Technology Corporation.
www.nuvoton.com

NuMaker-IoT-M263A
Aug 06, 2019 Page 2of 50 Rev 1.00
NUMAKER-IoT-M263A USER MANUAL
Maker Nu-mbed NUC472 User Manual
Table of Contents
1Overview.............................................................................................7
NuMaker-IoT-M263A Features ...................................................................... 81.1
2NuMaker-IoT-M263A Overview..................................................................9
Front View............................................................................................... 92.1
Rear View..............................................................................................112.2
Arduino UNO Compatible Extension Connectors................................................122.3
Pin Assignment for On-board Modules, Sensors and Connectors............................14
2.4
System Configuration ................................................................................162.5
2.5.1 VIN Power Source............................................................................................ 16
2.5.2 5 V Power Sources ........................................................................................... 16
2.5.3 3.3 V Power Sources......................................................................................... 16
2.5.4 1.8V Power Sources ......................................................................................... 17
2.5.5 Power Connectors............................................................................................ 17
2.5.6 USB Connectors .............................................................................................. 17
2.5.7 CAN Connectors.............................................................................................. 18
2.5.8 RS485 Connectors ........................................................................................... 18
2.5.9 Power Switches............................................................................................... 18
2.5.10 Target Chip Power Supply Models......................................................................... 19
2.5.11 On-board Module Power Supply Models.................................................................. 22
2.5.12 Mini PCIe Connector Power Supply Models ............................................................. 23
2.5.13 External Reference Voltage Connector ................................................................... 24
2.5.14 Ammeter Connector.......................................................................................... 24
2.5.15 Wi-Fi Module Update Switch................................................................................ 24
2.5.16 Extension Connectors........................................................................................ 25
2.5.17 Push-Buttons .................................................................................................. 25
2.5.18 LEDs............................................................................................................ 25
Nu-Link2-Me...........................................................................................262.6
PCB Placement .......................................................................................272.7
3Quick Start ........................................................................................ 28
Toolchains Support...................................................................................283.1
Nuvoton Nu-Link Driver Installation................................................................283.2
BSP Firmware Download............................................................................303.3
Hardware Setup.......................................................................................303.4

NuMaker-IoT-M263A
Aug 06, 2019 Page 3of 50 Rev 1.00
NUMAKER-IoT-M263A USER MANUAL
Maker Nu-mbed NUC472 User Manual
Find the Example Project............................................................................323.5
Execute the Project under Toolchains.............................................................323.6
3.6.1 Keil MDK ....................................................................................................... 32
3.6.2 IAR EWARM................................................................................................... 36
3.6.3 NuEclipse ...................................................................................................... 37
4NuMaker-IoT-M263A Schematics ............................................................. 38
Nu-Link2-Me...........................................................................................384.1
M263 Platform.........................................................................................394.2
Extension Connector.................................................................................404.3
Mini PCIe Connector .................................................................................414.4
On-board Bluetooth Module.........................................................................424.5
On-board Wi-Fi Module..............................................................................434.6
On-board LoRa Module..............................................................................444.7
On-board Sensors....................................................................................454.8
CAN and RS485 Connector.........................................................................464.9
MicroSD Card Connector............................................................................474.10
On-board Modules and Mini PCIe Connector Power ...........................................484.11
5REVISION HISTORY............................................................................ 49

NuMaker-IoT-M263A
Aug 06, 2019 Page 4of 50 Rev 1.00
NUMAKER-IoT-M263A USER MANUAL
Maker Nu-mbed NUC472 User Manual
List of Figures
Figure 1-1 NuMaker-IoT-M263A Board ........................................................................................... 7
Figure 2-1 Front View of NuMaker-IoT-M263A................................................................................ 9
Figure 2-2 Rear View of NuMaker-IoT-M263A .............................................................................. 11
Figure 2-3 Arduino UNO Compatible Extension Connectors......................................................... 12
Figure 2-4 External Power Supply Sources on Nu-Link2-Me ........................................................ 19
Figure 2-5 External Power Supply Sources on M263 Platform ..................................................... 20
Figure 2-6 Separate the Nu-Link2-Me from NuMaker-IoT-M263A ................................................ 21
Figure 2-7 External Power Supply Sources on NuMaker-IoT-M263A for On-board Modules....... 22
Figure 2-8 External Power Supply Sources on NuMaker-IoT-M263A for Mini PCIe Connector ... 23
Figure 2-9 Wiring between Ammeter Connector and Ammeter..................................................... 24
Figure 2-10 Front Placement ......................................................................................................... 27
Figure 2-11 Rear Placement.......................................................................................................... 27
Figure 3-1 Nu-Link USB Driver Installation Setup.......................................................................... 28
Figure 3-2 Nu-Link USB Driver Installation.................................................................................... 29
Figure 3-3 Open VCOM Function .................................................................................................. 30
Figure 3-4 ICE USB Connector...................................................................................................... 30
Figure 3-5 Device Manger.............................................................................................................. 31
Figure 3-6 PuTTY Session Setting................................................................................................. 31
Figure 3-7 Template Project Folder Path....................................................................................... 32
Figure 3-8 Warning Message “Device not found” .......................................................................... 32
Figure 3-9 Project File Migrate to Version 5 Format...................................................................... 33
Figure 3-10 Debugger Setting in Options Window......................................................................... 33
Figure 3-11 Programming Setting in Options Window................................................................... 34
Figure 3-12 Compile and Download the Project............................................................................ 34
Figure 3-13 Keil MDK Debug Mode............................................................................................... 35
Figure 3-14 Debug Message on Serial Port Terminal Windows.................................................... 35
Figure 3-15 IAR EWARM Window................................................................................................. 36
Figure 3-16 Compile and Download the Project............................................................................ 36
Figure 3-17 IAR EWARM Debug Mode ......................................................................................... 37
Figure 3-18 Debug Message on Serial Port Terminal Windows.................................................... 37
Figure 4-1 Nu-Link2-Me Circuit...................................................................................................... 38
Figure 4-2 M263 Platform Circuit................................................................................................... 39
Figure 4-3 Extension Connectors Circuit ....................................................................................... 40
Figure 4-4 Mini PCIe Connector Circuit ......................................................................................... 41
Figure 4-5 On-board Bluetooth Module Circuit.............................................................................. 42
Figure 4-6 On-board Wi-Fi Module Circuit..................................................................................... 43

NuMaker-IoT-M263A
Aug 06, 2019 Page 5of 50 Rev 1.00
NUMAKER-IoT-M263A USER MANUAL
Maker Nu-mbed NUC472 User Manual
Figure 4-7 On-board LoRa Module Circuit..................................................................................... 44
Figure 4-8 On-board Sensors Circuit............................................................................................. 45
Figure 4-9 CAN and RS485 Connector Circuit.............................................................................. 46
Figure 4-10 MicroSD Card Connector Circuit................................................................................ 47
Figure 4-11 On-board Modules and Mini PCIe Connector Power Circuit...................................... 48

NuMaker-IoT-M263A
Aug 06, 2019 Page 6of 50 Rev 1.00
NUMAKER-IoT-M263A USER MANUAL
Maker Nu-mbed NUC472 User Manual
List of Tables
Table 2-1 Arduino UNO Extension Connectors and M263KIAAE Mapping GPIO List.................. 13
Table 2-2 On-board Modules, Sensors, Connectors and M263KIAAE GPIO Function List.......... 15
Table 2-3 VIN Power Source ......................................................................................................... 16
Table 2-4 5V Power Sources......................................................................................................... 16
Table 2-5 3.3 V Power Sources..................................................................................................... 17
Table 2-6 1.8V Power Sources...................................................................................................... 17
Table 2-7 Power Connectors ......................................................................................................... 17
Table 2-8 USB Connectors ............................................................................................................ 17
Table 2-9 CAN Connectors............................................................................................................ 18
Table 2-10 RS485 Connectors....................................................................................................... 18
Table 2-11 Power Switches ........................................................................................................... 18
Table 2-12 Supply External Power through Nu-Link2-Me ............................................................. 19
Table 2-13 Supply External Power for M263 Platform................................................................... 21
Table 2-14 Supply External Power for On-board Modules ............................................................ 22
Table 2-15 Supply External Power through NuMaker-IoT-M263A ................................................ 23
Table 2-16 External Reference Voltage Connector....................................................................... 24
Table 2-17 Ammeter Connector..................................................................................................... 24
Table 2-18 Wi-Fi Module Update Switch ....................................................................................... 24
Table 2-19 Extension Connectors.................................................................................................. 25
Table 2-20 Push-Buttons ............................................................................................................... 25
Table 2-21 LEDs ............................................................................................................................ 25
Table 2-22 VCOM Function of Nu-Link2-Me.................................................................................. 26

NuMaker-IoT-M263A
Aug 06, 2019 Page 7of 50 Rev 1.00
NUMAKER-IoT-M263A USER MANUAL
Maker Nu-mbed NUC472 User Manual
1 OVERVIEW
This user manual is aimed to give users a fast introduction to the use of NuMaker-IoT-M263A board.
The NuMaker-IoT-M263A consists of two parts, a M263 platform with on-board modules, and an on-
board Nu-Link2-Me debugger and programmer. The NuMaker-IoT-M263A allows users to quickly
develop IoT (Internet of Thing) application and easily program and debug application.
The NuMaker-IoT-M263A offers M263KIAAE with Arduino UNO compatible extension connectors and
diversified power supply option. It is an easy-to-develop platform for user to expand the functionality
and build the applications. The NuMaker-IoT-M263A also provides an ammeter connector, allows user
to monitor the microcontroller’s power consumption during development.
The NuMaker-IoT-M263A contains several common kinds of wireless modules, like Wi-Fi, Bluetooth
and LoRa. The NuMaker-IoT-M263A also supports a mini PCIe connector. User can use other
modules, such as NB-IoT, 3G/4G, GPS. Besides, the NuMaker-IoT-M263A supports CAN and RS485
transceiver to make user develop industrial IoT application. Furthermore, the NuMaker-IoT-M263A
equips an environmental sensor and a 9-axis sensor for user application.
The Nu-Link2-Me is a debugger and programmer that supports on-line programming and debugging
through SWD interface. The on-board 16 Mbit SPI Flash allows it to off-line program the target
microcontroller. The Nu-Link2-Me provides virtual COM port (VCOM) function to print out messages
on PC. The Nu-Link2-Me can be separated from NuMaker-IoT-M263A, allowing user to use it as a
mass production programming tool.
Figure 1-1 NuMaker-IoT-M263A Board

NuMaker-IoT-M263A
Aug 06, 2019 Page 8of 50 Rev 1.00
NUMAKER-IoT-M263A USER MANUAL
Maker Nu-mbed NUC472 User Manual
NuMaker-IoT-M263A Features1.1
NuMicro®M263KIAAE used as main microcontroller with functions downward compatible
with:
M261ZIAAE
M261SIAAE
M261KIAAE
M262ZIAAE
M262SIAAE
M262KIAAE
M263ZIAAE
M263SIAAE
M263KIAAE
On-board modules:
Wi-Fi module: ESP12-F
Bluetooth module: MDBT42Q-PAT
LoRa module: APC1278 (for 408/433/470 MHz)
LoRa antenna: ANT60-433LA (for 433 MHz)
On-board sensors:
Environmental sensor: BME680
9-axis sensor: BMX055
Mini PCIe connector with SIM card connector
CAN and RS485 transceiver
MicroSD card connector
Arduino UNO compatible extension connectors
Ammeter connector for measuring the microcontroller’s power consumption
Fixable board power supply:
External VDD power connector
Arduino UNO compatible extension connector VIN
USB OTG connector on M263 platform
ICE USB connector on Nu-Link2-Me
Power jack for mini PCIe connector
On-board Nu-Link2-Me debugger and programmer:
Debug through SWD interface
On-line/off-line programming
Virtual COM port function

NuMaker-IoT-M263A
Aug 06, 2019 Page 9of 50 Rev 1.00
NUMAKER-IoT-M263A USER MANUAL
Maker Nu-mbed NUC472 User Manual
2 NUMAKER-IOT-M263A OVERVIEW
Front View2.1
ICE USB Connector
VCOM Switch
Reset Button
ICE Status LED
Off-line Program Button
USB OTG Connector
Power LED
PB10 LED
VDD Switch
Target Chip: M263KIAAE
Arduino UNO Compatible Extension Connector
External VDD Connector
Nu-Link2-Me
Ammeter
ICE Chip: M48SSIDAE
External VSS Connector
M263 Platform
External VREF Connector
Mini PCIe Connector
External Power Jack
External 5V Power Connector
External GND Power Connector
Mini PCIe UART Power Switch
Wi-Fi Module FW Update Switch
Mini PCIe Connector Power Switch
Wi-Fi Module Power Switch
LoRa Module Power Switch
Bluetooth Module Power Switch
Mini PCIe Connector Reset Button
Wi-Fi Module: ESP-12F
LoRa Module: APC1278
LoRa Antenna
LoRa Power LED
Bluetooth Module: MDBT42Q-PAT
Bluetooth LEDs
Environment Sensor: BME680
9-axis Sensor: BMX055
CAN Connector
RS485 Connector
Button1
Mini PCIe Connector LEDs
MicroSD Card Connector Power LED
Figure 2-1 Front View of NuMaker-IoT-M263A
Figure 2-1 shows the main components and connectors from the front side of NuMaker-IoT-M263A.
The following lists components and connectors from the front view:
Target Chip: M263KIAAE (U4)
On-board Modules:
Wi-Fi Module: ESP12-F (U9)
Firmware Update Switch (SW5)
Power Switch (SW8)
Bluetooth Module: MDBT42Q-PAT (U8)
Indicator LED and Connect LED (BT_LED1 and BT_LED2)
Power Switch (SW7)
LoRa Module: APC1278 (U10)
Antenna Connector (J10)
Power LED (LORA_POWER)
Power Switch (SW9)
On-board Sensors:
Environmental Sensor: BME680 (U11)
9-axis Sensor: BMX055 (U12)
Mini PCIe Connector (CON1)
External Power Jack (CON3)
External 5V Power Connector (JP9)
External GND Power Connector (JP10)

NuMaker-IoT-M263A
Aug 06, 2019 Page 10 of 50 Rev 1.00
NUMAKER-IoT-M263A USER MANUAL
Maker Nu-mbed NUC472 User Manual
Power Switch (SW6)
UART Power Switch (SW3)
Reset Button (SW4)
PG15, PD7 and PD6 LED (MPCIE_LED1, MPCIE_LED2 and MPCIE_LED3)
Indicator LED (MPCIE_LED4)
CAN Connector (CAN0 and JP7)
RS485 Connector (RS485 and JP8)
MicroSD Card Connector Power LED (SD_POWER)
USB OTG Connector (J2)
Arduino UNO Compatible Extension Connectors (NU1, NU2, NU3, NU4)
External VDD Power Connector (JP1)
External VSS Power Connector (JP2)
External VREF Connector (VREF1)
External VDDIO Connector (VDDIO)
VDD Switch (SW2)
Ammeter Connector (AMMETER)
Reset Button (SW1)
Button1 (SW10)
Power LED and PB10 LED (LEDG1 and LEDR1)
Nu-Link2-Me
VCOM Switch
ICE Chip: M48SSIDAE (ICEU2)
ICE USB Connector (ICEJ3)
ICE Status LED (ICES0,ICES1, ICES2, ICES3)
Off-line Program Button (ICESW1)

NuMaker-IoT-M263A
Aug 06, 2019 Page 11 of 50 Rev 1.00
NUMAKER-IoT-M263A USER MANUAL
Maker Nu-mbed NUC472 User Manual
Rear View2.2
ICEVCC Power Switch
MCUVCC Power Switch
CAN Transceiver
RS485 Transceiver
MicroSD Card Connector
SIM Card Connector
Figure 2-2 Rear View of NuMaker-IoT-M263A
Figure 2-2 shows the main components and connectors from the rear side of NuMaker-IoT-M263A.
The following lists components and connectors from the rear view:
CAN Transceiver (U13)
RS485 Transceiver (U14)
SIM Card Connector (CON2)
MicroSD Card Connector (U19)
Nu-Link2-Me
MCUVCC Power Switch (ICEJPR1)
ICEVCC Power Switch (ICEJPR2)

NuMaker-IoT-M263A
Aug 06, 2019 Page 12 of 50 Rev 1.00
NUMAKER-IoT-M263A USER MANUAL
Maker Nu-mbed NUC472 User Manual
Arduino UNO Compatible Extension Connectors2.3
Figure 2-3 shows the Arduino UNO compatible extension connectors.
MISO CLK RESET SS
PA.9 PA.11 nRESET PC.13
USCI0_DAT1 USCI0_CLK USCI0_CTL0
5V MOSI GND -
VDD PA.10 VSS PB.11
USCI0_DAT0
UART5_TXD EPWM0_CH0 PA.5 D8
UART5_RXD EPWM0_CH1 PA.4 D9
SPI0_SS EPWM0_CH2 PA.3 D10
SPI0_MOSI EPWM0_CH5 PA.0 D11
SPI0_MISO EPWM0_CH4 PA.1 D12
SPI0_CLK EPWM0_CH3 PA.2 D13
VSS VSS
VREF VREF
UART2_RXD I2C0_SDA PC.0 SDA
UART2_TXD I2C0_SCL PC.1 SCL
EPWM0_CH3 PB.2 D0
EPWM0_CH2 PB.3 D1
EPWM1_CH1 PC.4 D2
EPWM1_CH0 PC.5 D3
EPWM1_CH2 PC.3 D4
EPWM1_CH3 PC.2 D5
EPWM1_CH4 PA.7 D6
EPWM1_CH5 PA.6 D7
VIN
VSS
VSS
5V
3V
RST
IOREF VDD
NC
A5 PB.1 ADC0_CH1 I2C1_SCL UART2_TXD
A4 PB.0 ADC0_CH0 I2C1_SDA UART2_RXD
A3 PB.4 ADC0_CH4
A2 PB.5 ADC0_CH5
A1 PB.6 ADC0_CH6
A0 PB.7 ADC0_CH7
UART1_RXD
UART1_TXD
I2C1_SDA
I2C1_SCL
UART3_TXD
UART3_RXD
Figure 2-3 Arduino UNO Compatible Extension Connectors

NuMaker-IoT-M263A
Aug 06, 2019 Page 13 of 50 Rev 1.00
NUMAKER-IoT-M263A USER MANUAL
Maker Nu-mbed NUC472 User Manual
Header
NuMaker-IoT-M263A
Header
NuMaker-IoT-M263A
Compatible to
Arduino UNO
GPIO Pin of
M263KIAAE
Compatible to
Arduino UNO
GPIO Pin of
M263KIAAE
N
U
3
NU3.1
D0
PB.2
N
U
2
NU2.6
A5
PB.1
NU3.2
D1
PB.3
NU2.5
A4
PB.0
NU3.3
D2
PC.4
NU2.4
A3
PB.4
NU3.4
D3
PC.5
NU2.3
A2
PB.5
NU3.5
D4
PC.3
NU2.2
A1
PB.6
NU3.6
D5
PC.2
NU2.1
A0
PB.7
NU3.7
D6
PA.7
N
U
1
NU1.8
VIN
-
NU3.8
D7
PA.6
NU1.7
VSS
N
U
4
NU4.1
D8
PA.5
NU1.6
VSS
NU4.2
D9
PA.4
NU1.5
5V
NU4.3
D10
PA.3
NU1.4
3V
NU4.4
D11
PA.0
NU1.3
RST
nRESET
NU4.5
D12
PA.1
NU1.2
IOREF
VDD
NU4.6
D13
PA.2
NU1.1
NC
-
NU4.7
VSS
VSS
NU4.8
VREF
VREF
NU4.9
SDA
PC.0
NU4.10
SCL
PC.1
Table 2-1 Arduino UNO Extension Connectors and M263KIAAE Mapping GPIO List

NuMaker-IoT-M263A
Aug 06, 2019 Page 14 of 50 Rev 1.00
NUMAKER-IoT-M263A USER MANUAL
Maker Nu-mbed NUC472 User Manual
Pin Assignment for On-board Modules, Sensors and Connectors2.4
The NuMaker-IoT-M263A provides several on-board modules, sensors and connectors. Table 2-2
shows the mapping GPIO list.
On-board
Module/Sensor/Connector
NuMaker-IoT-M263A
Function of GPIO Pin
GPIO Pin of M263KIAAE
Wi-Fi
UART_TX
UART4_RXD
PC.6
UART_RX
UART4_TXD
PC.7
UART_RTS
UART4_nCTS
PC.8
UART_CTS
UART4_nRTS
PE.13
RST
GPIO
PE.12
Bluetooth
UART_TX
UART3_RXD
PD.0
UART_RX
UART3_TXD
PD.1
UART_RTS
UART3_nCTS
PD.2
UART_CTS
UART3_nRTS
PD.3
Flash_Default
GPIO
PE.1
UART_PD
GPIO
PE.0
Wakeup
GPIO
PH.8
LoRa
MISO
SPI1_MISO
PH.4
MOSI
SPI1_MOSI
PH.5
SCK
SPI1_CLK
PH.6
NSS
SPI1_SS
PH.7
NRST
GPIO
PF.6
DIO0
GPIO
PF.7
DIO1
GPIO
PF.8
DIO2
GPIO
PF.9
DIO3
GPIO
PF.10
DIO5
GPIO
PF.11
Environmental
Sensor and 9-
axis Sensor
SDI
I2C1_SDA
PD.4
SCL
I2C1_SCL
PD.5
Mini PCIe
Connector
UART_TXD
UART2_RXD
PE.14
UART_RXD
UART2_TXD
PE.15
UART_RTS
UART2_nCTS
PD.9

NuMaker-IoT-M263A
Aug 06, 2019 Page 15 of 50 Rev 1.00
NUMAKER-IoT-M263A USER MANUAL
Maker Nu-mbed NUC472 User Manual
On-board
Module/Sensor/Connector
NuMaker-IoT-M263A
Function of GPIO Pin
GPIO Pin of M263KIAAE
UART_CTS
UART2_nRTS
PD.8
UART_DTR
GPIO
PG.13
UART_DCD
GPIO
PG.14
WAKE#
GPIO
PG.9
UART_RI
GPIO
PG.10
W_DISABLE
GPIO
PG.11
PERST#
GPIO
PG.12
mPCIe_LED1
GPIO
PG.15
mPCIe_LED2
GPIO
PD.7
mPCIe_LED3
GPIO
PD.6
CAN
Transceiver
CAN_D
CAN0_TXD
PD.11
CAN_R
CAN0_RXD
PD.10
Rs_Ctrl1
GPIO
PG.2
Rs_Ctrl2
GPIO
PG.3
RS485
Transceiver
RS485_RO
USCI1_DAT0
PE.10
RS485_DI
USCI1_DAT1
PE.11
RS485_DE
USCI1_CTL1
PE.8
MicroSD Card
Connector
CD
SD0_nCD
PD.13
CMD
SD0_CMD
PE.7
CLK
SD0_CLK
PE.6
DAT0
SD0_DAT0
PE.2
DAT1
SD0_DAT1
PE.3
DAT2
SD0_DAT2
PE.4
DAT3
SD0_DAT3
PE.5
Table 2-2 On-board Modules, Sensors, Connectors and M263KIAAE GPIO Function List

NuMaker-IoT-M263A
Aug 06, 2019 Page 16 of 50 Rev 1.00
NUMAKER-IoT-M263A USER MANUAL
Maker Nu-mbed NUC472 User Manual
System Configuration2.5
2.5.1 VIN Power Source
Table 2-3 presents the VIN power source.
Connector
Net Name in
Schematic
Comment
NU1 pin8
NU1_VIN
Board external power source, with voltage range from 7
V to 12 V. The voltage regulator UP2 converts the NU1
pin8 input voltage to 5 V and supplies it to NuMaker-
IoT-M263A.
Table 2-3 VIN Power Source
2.5.2 5 V Power Sources
Table 2-4 presents the 5 V power sources.
Connector
Net Name in
Schematic
Comment
ICEJ3
USB_HS_VBUS
ICE USB connector supplies 5 V power from PC to
M263 platform and Nu-Link2-Me.
J2
USB_VBUS
If target chip M263 acts as USB Device, USB connector
on NuMaker-IoT-M263A supplies 5 V power from PC to
M263 platform and Nu-Link2-Me.
If target chip M263 acts as USB Host, USB connector
on NuMaker-IoT-M263A supplies 5 V power from M263
platform to PC.
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: M263 operating voltage range is from 1.8 V to 3.6
V. Do not switch SW2.1 (NU1 5VCC) to ON.
CON3
DC5V_IN
External 5 V from power adapter to on-board modules.
Note: It is necessary if user uses module on mini PCIe
connector.
Table 2-4 5V Power Sources
2.5.3 3.3 V Power Sources
Table 2-5 presents the 3.3 V power sources.
Voltage Regulator
5V Source
Comment
ICEUP1
USB_HS_VBUS
ICEUP1 converts USB_HS_VBUS to 3.3 V and supplies
3.3V to M263 platform or ICE chip.
UP1
USB_VBUS
UP1 converts USB_VBUS to 3.3 V and supplies 3.3 V
to M263 platform.

NuMaker-IoT-M263A
Aug 06, 2019 Page 17 of 50 Rev 1.00
NUMAKER-IoT-M263A USER MANUAL
Maker Nu-mbed NUC472 User Manual
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
M263 platform.
Note: SW2.2 (NU1 3VCC) should be switched to ON.
Table 2-5 3.3 V Power Sources
2.5.4 1.8V Power Sources
Table 2-6 presents the 1.8 V power source.
Voltage Regular
5V Source
Comment
ICEUP2
USB_HS_VBUS
ICEUP2 converts USB_HS_VBUS to 1.8V and supplies
1.8V to M263 platform or ICE chip.
Table 2-6 1.8V Power Sources
2.5.5 Power Connectors
Table 2-7 presents the power connectors.
Connector
Comment
JP1
VDD (1.8 V ~ 3.6 V) connector on the NuMaker-IoT-M263A.
JP2
VSS connector on the NuMaker-IoT-M263A.
JP9
5V connector on the NuMaker-IoT-M263A for on-board modules.
JP10
VSS connector on the NuMaker-IoT-M263A.
Table 2-7 Power Connectors
2.5.6 USB Connectors
Table 2-8 presents the USB connectors.
Connector
Comment
ICEJ3
ICE USB connector on Nu-Link2-Me for power supply, debugging and
programming from PC.
J2
USB OTG connector on NuMaker-IoT-M263A for USB function.
Table 2-8 USB Connectors

NuMaker-IoT-M263A
Aug 06, 2019 Page 18 of 50 Rev 1.00
NUMAKER-IoT-M263A USER MANUAL
Maker Nu-mbed NUC472 User Manual
2.5.7 CAN Connectors
Table 2-9 presents the CAN connectors.
Connector
Comment
CAN0 and JP7
CAN connector on NuMaker-IoT-M263A for CAN function.
Table 2-9 CAN Connectors
2.5.8 RS485 Connectors
Table 2-10 presents the CAN connectors.
Connector
Comment
RS485 and JP8
RS485 connector on NuMaker-IoT-M263A for RS485 function.
Table 2-10 RS485 Connectors
2.5.9 Power Switches
Table 2-11 presents the power switches.
Switch
Comment
ICEJPR1
Configure the target chip operating voltage at 1.8V / 3.3V / 5V.
ICEJPR2
Configure the ICE chip operating voltage at 1.8V / 3.3V.
SW2
Configure the target chip operating voltage at 3.3V / 5V.
SW3
Configure the UART operating voltage of mini PCIe connector at 1.8V /
3.3V.
SW6
Turn on/off the power to mini PCIe connector. All pins should be the
same side.
SW7
Turn on/off the power to Bluetooth module. All pins should be the same
side.
SW8
Turn on/off the power to Wi-Fi module. All pins should be the same side.
SW9
Turn on/off the power to LoRa module. All pins should be the same side.
Table 2-11 Power Switches

NuMaker-IoT-M263A
Aug 06, 2019 Page 19 of 50 Rev 1.00
NUMAKER-IoT-M263A USER MANUAL
Maker Nu-mbed NUC472 User Manual
2.5.10 Target Chip Power Supply Models
External Power Supply through Nu-Link2-Me to Target Chip2.5.10.1
The external power supply source on Nu-Link2-Me is shown in Figure 2-4.
ICE USB Connector (ICEJ3)
Nu-Link2-Me
Figure 2-4 External Power Supply Sources on Nu-Link2-Me
To use ICEJ3 as external power supply source with Nu-Link2-Me, please follow the steps below:
1. Solder the resistor on ICEJPR1 (MCUVCC) depending on the target chip operating voltage.
2. Solder the resistor on ICEJPR2 (ICEVCC) depending on the ICE chip operating voltage.
3. Switch the SW2 to OFF.
Table 2-12 presents all power models when supplying external power through Nu-Link2-Me. The Nu-
Link2-Me external power sources are highlighted in yellow.
Model
Target
Chip
Voltage
ICEJ3
ICEJPR1
(MCUVCC)
Selection [1]
ICEJPR2
(ICEVCC)
Selection [2]
ICE
Chip
Voltage
SW2
Selection
J2
VIN
JP1
1
1.8 V
Connect
to PC
1.8 V
1.8 V
1.8 V
Off
Ignore
Ignore
1.8 V
output
2
3.3 V
Connect
to PC
3.3 V (default)
3.3 V (default)
3.3 V
Off
Ignore
Ignore
3.3 V
output
3
5 V
Connect
to PC
5V
3.3 V (default)
3.3 V
Off
Ignore
Ignore
5 V
output
X: Unused.
Note:
1. 0 Ω should be soldered between ICEJPR1’s MCUVCC and 1.8 V / 3.3 V / 5 V.
2. 0 Ω should be soldered between ICEJPR2’s ICEVCC and 1.8 V / 3.3 V.
Table 2-12 Supply External Power through Nu-Link2-Me

NuMaker-IoT-M263A
Aug 06, 2019 Page 20 of 50 Rev 1.00
NUMAKER-IoT-M263A USER MANUAL
Maker Nu-mbed NUC472 User Manual
External Power Supply through M263 Platform to Target Chip2.5.10.2
The external power supply sources on the M263 Platform are shown in Figure 2-5.
USB Power Connector (J2)
NU1 pin8 (VIN)
External VDD Connector (JP1)
External VSS Connector (JP2)
Figure 2-5 External Power Supply Sources on M263 Platform
To use VIN or J2 as external power supply source, please follow the steps below:
1. Switch the SW2 depending on the target chip operating voltage.
2. Remove the resistor on ICEJPR1 (MCUVCC).
3. Solder the resistor on ICEJPR2 (ICEVCC) depending 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 steps below:
1. Switch the SW2 to OFF.
2. Remove the resistor on ICEJPR1 (MCUVCC).
3. Solder the resistor on ICEJPR2 (ICEVCC) depending 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 when the Nu-Link2-Me is
separated from NuMaker-IoT-M263A, please follow the steps below:
1. Switch the SW2 depending on the target chip operating voltage.
2. Separate the Nu-Link2-Me from NuMaker-IoT-M263A.
3. Connect the external power supply to VIN or J2.
To use JP1 as external power supply source with Nu-Link2-Me when the Nu-Link2-Me is separated
from NuMaker-IoT-M263A, please follow the steps below: