Nuvoton NuMaker-IoT-M2354U User manual

NuMaker-IoT-M2354
Jul. 16, 2021 Page 1of 54 Rev 1.00
NUMAKER-IoT-M2354 USER MANUAL
Maker Nu-mbed NUC472 User Manual
NuMicro® Family
Arm®32-bit Cortex®-M23 Microcontroller
NuMaker-IoT-M2354U
NuMaker-IoT-M2354C
User Manual
Evaluation Board for NuMicro®M2354 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 and
microprocessor 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

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Table of Contents
1Overview.................................................................................... 7
2Features .................................................................................... 8
3Hardware Configuration.................................................................. 9
Front View...................................................................................... 9
Rear View.....................................................................................11
Extension Connectors.......................................................................12
3.3.1 Arduino UNO Compatible Extension Connectors ............................................. 12
mikroBUS Interface..........................................................................14
Pin Assignment for On-board Modules, Sensors and Connectors...................14
Power Supply Configuration ...............................................................15
3.6.1 VIN Power Source.................................................................................. 15
3.6.2 5V Power Sources.................................................................................. 16
3.6.3 3.3 V Power Sources............................................................................... 16
3.6.4 1.8V Power Sources ............................................................................... 16
3.6.5 Power Connectors.................................................................................. 17
3.6.6 USB Connectors .................................................................................... 17
3.6.7 Power Switches..................................................................................... 17
3.6.8 CAN Connectors.................................................................................... 18
3.6.9 RS485 Connectors ................................................................................. 18
3.6.10 Power Supply Models.............................................................................. 18
On-board Module Power Supply Models.................................................21
External Reference Voltage Connector ..................................................22
Ammeter Connector.........................................................................22
Push-Buttons .................................................................................23
LEDs...........................................................................................23
Wi-Fi Module Update Switch...............................................................24
COM/SEG LCD interface and HTN-LCD Panel.........................................25
Nu-Link2-Me..................................................................................26
3.14.1 VCOM Switches..................................................................................... 26
3.14.2 Status LEDs ......................................................................................... 26
4Quick Start ............................................................................... 27
Toolchains Support..........................................................................27
Nuvoton Nu-Link Driver Installation.......................................................27

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BSP Firmware Download...................................................................29
Hardware Setup..............................................................................29
Finding the Example Project...............................................................31
Executing the Project under Toolchains .................................................31
4.6.1 Keil MDK ............................................................................................. 31
4.6.2 IAR EWARM......................................................................................... 34
4.6.3 NuEclipse ............................................................................................ 36
5NuMaker-IOT-M2354 Schematics.................................................... 42
Nu-Link2-Me..................................................................................42
M2354 target Board .........................................................................43
Arduino UNO Compatible Interface.......................................................44
Wi-Fi Module .................................................................................45
LoRa Module .................................................................................46
On-board Sensors...........................................................................47
CAN and RS485 Connector................................................................48
mikroBUS Interface..........................................................................49
LCD interface.................................................................................50
Power Connector of On-board Module...................................................51
PCB Placement ..............................................................................52
6REVISION HISTORY................................................................... 53

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List of Figures
Figure 1-1 NuMaker-IoT-M2354 Evaluation Board.......................................................................... 7
Figure 3-1 Front View of NuMaker-IoT-M2354................................................................................ 9
Figure 3-2 Rear View of NuMaker-IoT-M2354............................................................................... 11
Figure 3-3 Arduino UNO Compatible Extension Connectors......................................................... 12
Figure 3-4 External Power Supply Sources on Nu-Link2-Me ........................................................ 18
Figure 3-5 External Power Supply Sources on M2354 target board ............................................. 19
Figure 3-6 Separate the Nu-Link2-Me from NuMaker-IoT-M2354................................................. 20
Figure 3-7 External Power Supply Sources on NuMaker-IoT-M2354 for On-board Modules ....... 21
Figure 3-8 Wiring between Ammeter Connector and Ammeter..................................................... 23
Figure 4-1 Nu-Link USB Driver Installation Setup.......................................................................... 27
Figure 4-2 Nu-Link USB Driver Installation.................................................................................... 28
Figure 4-3 Open VCOM Function .................................................................................................. 29
Figure 4-4 ICE USB Connector...................................................................................................... 30
Figure 4-5 Device Manger.............................................................................................................. 30
Figure 4-6 PuTTY Session Setting................................................................................................. 30
Figure 4-7 Blinky Project Folder Path ............................................................................................ 31
Figure 4-8 Debugger Setting in Options Window........................................................................... 31
Figure 4-9 Programming Setting in Options Window..................................................................... 32
Figure 4-10 Compile and Download the Project............................................................................ 32
Figure 4-11 Keil MDK Debug Mode............................................................................................... 33
Figure 4-12 Debug Message on Serial Port Terminal Windows.................................................... 33
Figure 4-13 IAR EWARM Window................................................................................................. 34
Figure 4-14 Compile and Download the Project............................................................................ 34
Figure 4-15 IAR EWARM Debug Mode ......................................................................................... 35
Figure 4-16 Debug Message on Serial Port Terminal Windows.................................................... 35
Figure 4-17 Import the Project in NuEclipse.................................................................................. 36
Figure 4-18 Import Projects Windows............................................................................................ 36
Figure 4-19 Build Project................................................................................................................ 37
Figure 4-20 Project Properties Settings......................................................................................... 37
Figure 4-21 Build Project................................................................................................................ 38
Figure 4-22 Open Debug Configuration......................................................................................... 38
Figure 4-23 Main Tab Configuration .............................................................................................. 39
Figure 4-24 Debugger Tab Configuration ...................................................................................... 39
Figure 4-25 Startup Tab Configuration .......................................................................................... 40
Figure 4-26 NuEclipse Debug Mode.............................................................................................. 41
Figure 4-27 Debug Message on Serial Port Terminal Windows.................................................... 41

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Figure 5-1 Nu-Link2-Me Circuit...................................................................................................... 42
Figure 5-2 M2354 Platform Circuit................................................................................................. 43
Figure 5-3 Arduino UNO Compatible Interface.............................................................................. 44
Figure 5-4 Wi-Fi Module Circuit ..................................................................................................... 45
Figure 5-5 LoRa Module Circuit..................................................................................................... 46
Figure 5-6 on-board sensors Circuit .............................................................................................. 47
Figure 5-7 CAN and RS485 Connector Circuit.............................................................................. 48
Figure 5-8 mikroBUS Circuit .......................................................................................................... 49
Figure 5-9 LCD interface Circuit..................................................................................................... 50
Figure 5-10 on-board modules power of NuMaker-IoT-M2354 ..................................................... 51
Figure 5-11 Front Placement ......................................................................................................... 52
Figure 5-12 Rear Placement.......................................................................................................... 52

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List of Tables
Table 3-1 Extension Connectors.................................................................................................... 12
Table 3-2 Arduino UNO Extension Connectors and M2354KJFAE Mapping GPIO List............... 13
Table 3-3 mikroBUS Mapping with M2354KJFAE ......................................................................... 14
Table 3-4 On-board Modules, Sensors, Connectors and M2354KJFAE GPIO Function List ....... 15
Table 3-5 Vin Power Source.......................................................................................................... 15
Table 3-6 5V Power Sources......................................................................................................... 16
Table 3-7 3.3 V Power Sources..................................................................................................... 16
Table 3-8 1.8V Power Sources...................................................................................................... 16
Table 3-9 Power Connectors ......................................................................................................... 17
Table 3-10 USB Connectors.......................................................................................................... 17
Table 3-11 Power Switches ........................................................................................................... 17
Table 3-12 CAN Connectors.......................................................................................................... 18
Table 3-13 RS485 Connectors....................................................................................................... 18
Table 3-14 Supply External Power through Nu-Link2-Me ............................................................. 19
Table 3-15 Supply External Power for M2354 target board........................................................... 21
Table 3-16 Supply External Power for On-board Modules ............................................................ 22
Table 3-17 External Reference Voltage Connector....................................................................... 22
Table 3-18 Ammeter Connector..................................................................................................... 22
Table 3-19 Push-Buttons ............................................................................................................... 23
Table 3-20 LEDs ............................................................................................................................ 23
Table 3-21 Wi-Fi Module Update Switch ....................................................................................... 24
Table 3-22 COM/SEG LCD function of M2354KJFAE................................................................... 26
Table 3-23 VCOM Function of Nu-Link2-Me.................................................................................. 26
Table 3-24 Status LEDs patterns of Nu-Link2-Me......................................................................... 26

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1 OVERVIEW
The NuMaker-IoT-M2354 is an evaluation board for Nuvoton NuMicro M2354 microcontrollers. The
NuMaker-IoT-M2354 consists of two parts, a M2354 target board and an on-board Nu-Link2-Me
debugger and programmer. The NuMaker-IoT-M2354 is designed for secure IoT application, prototype
development and validation with power consumption monitoring function.
The M2354 target board contains two kinds of wireless modules, Wi-Fi and LoRa. For different frequency
band requirement, NuMaker-IoT-M2354U and NuMaker-IoT-M2354C support 915 MHz and 433 MHz
frequency band, respectively. The M2354 target board supports CAN and RS485 transceiver for users
to develop industrial IoT applications. Furthermore, the M2354 target board is equipped with an
environmental sensor and LCD display panel (8 COM/40 SEG) for quick development.
The M2354 target board is based on NuMicro M2354KJFAE. For the development flexibility, the M2354
target board provides the extension connectors of M2354KJFAE, the Arduino UNO compatible headers,
mikroBUS™ interface and the capability of adopting multiple power supplies by external power
connectors. Furthermore, the Nuvoton-designed ammeter connector can measure the power
consumption instantly, which is essential for the prototype evaluation.
In addition, there is an attached on-board debugger and programmer “Nu-Link2-Me”. The Nu-Link2-
Me supports on-chip debugging, online and offline ICP programming via SWD interface. The Nu-
Link2-Me supports virtual COM (VCOM) port for printing debug messages on PC. Besides, the
programming status could be shown on the built-in LEDs. Lastly, the Nu-Link2-Me could be detached
from the evaluation board and become a stand-alone mass production programmer.
Figure 1-1 NuMaker-IoT-M2354 Evaluation Board

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2 FEATURES
NuMicro M2354KJFAE used as main microcontroller with function compatible with:
–M2354LJFAE
–M2354SJFAE
Arduino UNO compatible extension connectors
mikroBUS compatible connectors
CAN and RS485 transceiver
8COM/40SEG LCD with panel
Environmental sensor: BME680
Wi-Fi module
LoRa module:
–NuMaker-IoT-M2354U for 915 MHz
–NuMaker-IoT-M2354C for 433 MHz
Ammeter connector for measuring the microcontroller’s power consumption
Flexible board power supply:
–External VDD power connector
–Arduino UNO compatible extension connector Vin
–USB FS connector on M2354 target board
–ICE USB connector on Nu-Link2-Me
On-board Nu-Link2-Me debugger and programmer:
–Debug through SWD interface
–Online/offline programming
–Virtual COM port function

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3 HARDWARE CONFIGURATION
Front View
ICE USB Connector
VCOM Switch
Reset Button
ICE Status LED
Off-line Program Button
USB OTG Connector
Power LED &PB10LED
VDD Switch
M2354KJFAE
Arduino UNO Compatible Extension Connectors
External Power Jack
Nu-Link2-Me
Ammeter
ICE Chip: M48SSIDAE
External VSS Connector
External GND Connector
Button 1
Wi-Fi Module: ESP-12F
Wi-Fi Module FW Update Switch
LoRa Module: SX1276
LoRa Power LED
LoRa Antenna
CAN Connector
RS485 Connector
External VDD Connector
Com/Seg LCD Panel
mikroBUS connector
External 5V Power Connector
mikro BUS Pin switch
LCD Pin switch
Environmental Sensor: BME680
External VREF Connector
External VDDIO Connector
M2354 Target Board
Figure 3-1 Front View of NuMaker-IoT-M2354
Figure 3-1 shows the main components and connectors from the front side of NuMaker-IoT-M2354.
The following lists components and connectors from the front view:
Target Chip: M2354KJFAE (U4)
USB PWR 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)
External Power Jack (CON1)
VDD Switch (SW2)
Ammeter Connector (AMMETER)
Reset Button (SW1) and push Button (SW10)
Power LED and PD0 LED (LEDG1 and LEDR1)
Wi-Fi Module (U9)
–Power Switch (SW8)
–Firmware Udpate Switch (SW5)
LoRa Module (U10)
–Power Switch (SW9)

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–Antenna Connector (J10)
COM/SEG LCD interface (JLCD_1) and LCD panel (JLCD_2)
–LCD pin switch (S2)
Environmental sensor: BME680 (U11)
mikroBUS connector (MBUS1)
–mikroBUS pin switch (S1)
CAN Connector (CAN0 and JP7)
RS485 Connector (RS485 and JP8)
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)

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Rear View
Figure 3-2 shows the main components and connectors from the rear side of NuMaker-IoT-M2354.
The following lists components and connectors from the rear view:
CAN Transceiver (U13)
RS485 Transceiver (U14)
Nu-Link2-Me
–MCUVCC Power Switch (ICEJPR1)
–ICEVCC Power Switch (ICEJPR2)
ICEVCC Power Switch
MCUVCC Power Switch
RS485 Transceiver
CAN Transceiver
Figure 3-2 Rear View of NuMaker-IoT-M2354

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Extension Connectors
Table 3-1 presents the Arduino UNO compatible extension connectors.
Connector
Description
NU1, NU2, NU3 and
NU4
Arduino UNO compatible pins on the NuMaker-IoT-M2354.
Table 3-1 Extension Connectors
3.3.1 Arduino UNO Compatible Extension Connectors
Figure 3-3 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 3-3 Arduino UNO Compatible Extension Connectors

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Header
NuMaker-IoT-M2354
Header
NuMaker-IoTM2354
Compatible to
Arduino UNO
GPIO Pin of M2354
Compatible to
Arduino UNO
GPIO Pin of M2354
NU3
NU3.1
D0
PB.2
NU2
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
NU1
NU1.8
VIN
-
NU3.8
D7
PA.6
NU1.7
VSS
NU4
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
AVSS
GND
NU4.8
VREF
VREF
NU4.9
SDA
PC.0
NU4.10
SCL
PC.1
Table 3-2 Arduino UNO Extension Connectors and M2354KJFAE Mapping GPIO List

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mikroBUS Interface
The NuMaker-IoT-M2354 features a MikroElektronika mikroBUS socket which has the smallest
number of pins but have maximum expandability. The MikroElektronika mikroBUS consists of
communications pins including SPI, UART and I2C, one PWM pin, one interrupt pin, one analog input
pin, one reset pin and one chip select pin, and have 3.3V and 5V power pin. Table 3-3 shows
mikroBUS Mapping with M2354KJFAE.
For more information about MikroElektronika mikroBUS standard, please visit the MikroElektronika
mikroBUS website: https://www.mikroe.com/mikrobus .
MBUS1
NuMaker-IoT-M2354
MBUS1
NuMaker-IoT-M2354
Compatible to
mikroBUS
M2354KJFAE
Compatible to
mikroBUS
M2354KJFAE
1
AN
EADC0_CH10 (PB.10)
16
PWM[1]
EPWM0_CH5 (PE.2)
2
RST
PD.4
15
INT
PD.5
3
CS[1]
QSPI0_SS (PH.9)
14
RX[1]
UART5_RXD (PE.6)
4
SCLK[1]
QSPI0_CLK (PH.8)
13
TX[1]
UART5_TXD (PE.7)
5
MISO[1]
QSPI0_MISO0 (PE.1)
12
SCL
I2C1_SCL (PB.1)
6
MOSI[1]
QSPI0_MOSI0 (PE.0)
11
SDA
I2C1_SDA (PB.0)
7
3VCC
-
10
5VCC
-
8
GND
-
9
GND
-
Note:
Switch S1.1 to S1.7 to ON when using mikroBUS functions
Table 3-3 mikroBUS Mapping with M2354KJFAE
Pin Assignment for On-board Modules, Sensors and Connectors
The NuMaker-IoT-M2354 provides several on-board modules, sensors and connectors. Table 3-4
shows the mapping GPIO list.
On-board Module/Sensor/Connector
NuMaker-IoT-M2354
Function of GPIO Pin
GPIO Pin of M2354KJFAE
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
LoRa
MISO
SPI3_MISO
PC.12
MOSI
SPI3_MOSI
PC.11
SCK
SPI3_CLK
PC.10

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On-board Module/Sensor/Connector
NuMaker-IoT-M2354
Function of GPIO Pin
GPIO Pin of M2354KJFAE
NSS
SPI3_SS
PC.9
NRST
GPIO
PF.6
DIO0
GPIO
PF.7
DIO1
GPIO
PF.8
DIO2
GPIO
PF.9
DIO3
GPIO
PF.10
DIO4
GPIO
PF.11
DIO5
GPIO
PD.12
LoRa_TCXO_EN
GPIO
PA.8
Environmental Sensor
SDI
I2C2_SDA
PB.12
SCL
I2C2_SCL
PB.13
CAN Transceiver
CAN_D
CAN0_TXD
PD.11
CAN_R
CAN0_RXD
PD.10
RS485 Transceiver
RS485_RO
USCI0_DAT0
PE.10
RS485_DI
USCI0_DAT1
PE.11
RS485_DE
USCI0_CTL1
PE.8
Table 3-4 On-board Modules, Sensors, Connectors and M2354KJFAE GPIO Function List
Power Supply Configuration
The NuMaker-IoT-M2354 is able to adopt multiple power supply. External power source includes NU1
Vin (7 V to 12 V), VDD (depending on target chip operating voltage), and PC through USB connector. By
using switches and voltage regulator, multiple power domains can be created on the NuMaker-IoT-
M2354.
3.6.1 VIN Power Source
Table 3-5 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 5V and supplies it to NuMaker-IoT-
M2354.
Table 3-5 Vin Power Source

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3.6.2 5V Power Sources
Table 3-6 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
M2354 target board and Nu-Link2-Me.
J2
USB_VBUS
USB connector on NuMaker-IoT-M2354 supplies 5 V
power from PC to M2354 target board and Nu-Link2-
Me.
NU1 pin5
NU1_5VCC
ICEJ3, J2 or NU1 pin8 supplies 5 V power to NU1
pin5. NU1 pin5 supplies 5 V power to the target chip or
Arduino adapter board.
Note: The M2354 operating voltage range is from 1.7
V to 3.6 V. Do not switch SW2.1 (NU1 5VCC) to ON.
CON3
DC5V_IN
External 5V from power adapter to on-board modules.
Table 3-6 5V Power Sources
3.6.3 3.3 V Power Sources
Table 3-8 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 M2354 target boardor ICE chip.
UP1
USB_VBUS
UP1 converts USB_VBUS to 3.3 V and supplies 3.3 V
to M2354 target board.
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 M2354 target board.
Note: SW2.2(NU1 3VCC) should be switched to ON.
Table 3-7 3.3 V Power Sources
3.6.4 1.8V Power Sources
Table 3-8 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 M2354 target boardor ICE chip.
Table 3-8 1.8V Power Sources

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3.6.5 Power Connectors
Table 3-9 presents the power connectors.
Connector
Comment
JP1
VDD connector on the NuMaker-IoT-M2354.
Note: M2354 operating voltage range is from 1.7 V to 3.6 V.
JP2, JP10
VSS connector on the NuMaker-IoT-M2354.
JP9
5 V connector on the NuMaker-IoT-M2354 for on-board modules.
Table 3-9 Power Connectors
3.6.6 USB Connectors
Table 3-10 presents the USB connectors.
Connector
Comment
ICEJ3
ICE USB connector on Nu-Link2-Me for power supply, debugging and
programming from PC.
J2
USB FS connector on NuMaker-IoT-M2354 for power supply.
Table 3-10 USB Connectors
3.6.7 Power Switches
Table 3-11 presents the power switches.
Switch
Comment
ICEJPR1
Configures the target chip operating voltage at 1.8 V / 3.3 V / 5 V.
Note: M2354 operating voltage range is from 1.7 V to 3.6 V. Do not
switch ICEJPR1 (MCUVCC) to 5 V.
ICEJPR2
Configures the ICE chip operating voltage at 1.8 V / 3.3 V.
SW2
Configures the target chip power source from ICE or NU1_3VCC.
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 3-11 Power Switches

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3.6.8 CAN Connectors
Table 3-12 presents the CAN connectors.
Connector
Comment
CAN0 and JP7
CAN connector on NuMaker-IoT-M2354 for CAN function.
Table 3-12 CAN Connectors
3.6.9 RS485 Connectors
Table 3-13 presents the RS485 connectors.
Connector
Comment
RS485 and JP8
RS485 connector on NuMaker-IoT-M2354 for RS485 function.
Table 3-13 RS485 Connectors
3.6.10 Power Supply Models
External Power Supply through Nu-Link2-Me to Target Chip
The external power supply source on Nu-Link2-Me is shown in Figure 3-4.
ICE USB Connector (ICEJ3)
Nu-Link2-Me
Figure 3-4 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.

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2. Solder the resistor on ICEJPR2 (ICEVCC) depending on the ICE chip operating voltage.
3. Connect the external power supply to ICEJ3.
Table 3-14 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
SW4
Selection
J2
Vin
JP13
1
1.8 V
Connect
to PC
1.8 V
1.8 V
1.8 V
Off
-
-
1.8 V
output
2
3.3 V
Connect
to PC
3.3 V (default)
3.3 V
(default)
3.3 V
Off
-
-
3.3 V
output
3
5 V
Connect
to PC
5V
3.3 V
(default)
3.3 V
Off
-
-
5 V
output
-: 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 3-14 Supply External Power through Nu-Link2-Me
External Power Supply through M2354 target board to Target Chip
The external power supply sources on M2354 target board are shown in Figure 3-5.
USB Power Connector (J2) NU1 pin8 (Vin)
External VDD Connector (JP1)
External VSS Connector (JP2)
Figure 3-5 External Power Supply Sources on M2354 target board
To use Vin or J2 as external power supply source, please follow the steps below:

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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 separated from NuMaker-IoT-
M2354, 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-M2354.
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-IoT-M2354,
please follow the steps below:
1. Switch the SW2 to OFF.
2. Separate the Nu-Link2-Me from NuMaker-IoT-M2354.
3. Connect the external power supply to JP1.
USB Power Connector (J2) NU1 pin8 (Vin)
External VDD Connector (JP1)
External VSS Connector (JP2) Detach Nu-Link2-Me
"
"
Figure 3-6 Separate the Nu-Link2-Me from NuMaker-IoT-M2354
Table 3-15 presents all power models when supplying external power through the M2354 target board.