Nuvoton NuMaker-LoRaD470-M252 User manual

NuMaker-LoRaD470/868/915-M252
Dec. 21, 2020 Page 1of 31 Rev 1.00
NUMAKER-LORAD470/868/915-M252 USER MANUAL
Maker Nu-mbed NUC472 User Manual
NuMicro® Family
Based on Arm®Cortex®-M23
NuMaker-LoRaD470-M252
NuMaker-LoRaD868-M252
NuMaker-LoRaD915-M252
User Manual
Evaluation Board for LoRa Ecosystem Device Design
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

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Table of Contents
1OVERVIEW......................................................................................................5
2FEATURES......................................................................................................6
3HARDWARE CONFIGURATION.....................................................................7
3.1 Front View....................................................................................................................... 7
3.2 Rear View ....................................................................................................................... 8
3.3 Extension Connectors................................................................................................... 9
3.3.1 Pin Assignment for Extension Connectors ...................................................................9
3.3.2 Arduino UNO Compatible Extension Connectors......................................................14
3.4 Pin Assignment for On-board LoRa Module............................................................ 16
3.5 Power Supply Configuration ...................................................................................... 16
3.5.1 VIN Power Source..........................................................................................................16
3.5.2 5 V Power Sources ........................................................................................................17
3.5.3 3.3 V Power Sources .....................................................................................................17
3.5.4 1.8 V Power Sources .....................................................................................................17
3.5.5 Power Connectors..........................................................................................................18
3.5.6 USB Connectors.............................................................................................................18
3.5.7 Power Switches ..............................................................................................................18
3.5.8 Power Supply Models ....................................................................................................19
3.6 External Reference Voltage Connector.................................................................... 22
3.7 Voltage Adjustable Interface (VAI) Connector......................................................... 22
3.8 Battery Voltage (VBAT) Connector.............................................................................. 22
3.9 Ammeter Connector.................................................................................................... 22
3.10 Push Buttons.......................................................................................................... 23
3.11 LEDs........................................................................................................................ 23
3.12 Nu-Link2-Me........................................................................................................... 24
3.12.1VCOM Switches..............................................................................................................24
3.12.2Status LEDs ....................................................................................................................24
4NUMAKER-LORAD-M252 SCHEMATICS ....................................................25
4.1 Nu-Link2-Me................................................................................................................. 25
4.2 M252 Target Board...................................................................................................... 26
4.3 Extension Connectors................................................................................................. 27
4.4 LoRa Module................................................................................................................ 28
4.5 PCB Placement ........................................................................................................... 29
5REVISION HISTORY .....................................................................................30

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List of Figures
Figure 1-1 NuMaker-LoRaD-M252 Evaluation Board...................................................................... 5
Figure 3-1 Front View of NuMaker-LoRaD-M252............................................................................ 7
Figure 3-2 Rear View of NuMaker-LoRaD-M252............................................................................. 8
Figure 3-3 M252KG6AE Extension Connectors .............................................................................. 9
Figure 3-4 Arduino UNO Compatible Extension Connectors......................................................... 14
Figure 3-5 External Power Supply Sources on Nu-Link2-Me ........................................................ 19
Figure 3-6 External Power Supply Sources on M252 Target Board.............................................. 20
Figure 3-7 Detach the Nu-Link2-Me from NuMaker-LoRaD-M252................................................ 21
Figure 3-8 Wiring between Ammeter Connector and Ammeter..................................................... 23
Figure 4-1 Nu-Link2-Me Circuit...................................................................................................... 25
Figure 4-2 M252 Target Board Circuit ........................................................................................... 26
Figure 4-3 Extension Connectors Circuit ....................................................................................... 27
Figure 4-4 LoRa Module Circuit..................................................................................................... 28
Figure 4-5 Front Placement ........................................................................................................... 29
Figure 4-6 Rear Placement............................................................................................................ 29

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List of Tables
Table 3-1 Extension Connectors...................................................................................................... 9
Table 3-2 M252KG6AE Full-pin Extension Connectors and GPIO Function List.......................... 13
Table 3-3 Arduino UNO Extension Connectors and M252KG6AE Mapping GPIO List ................ 15
Table 3-4 On-board LoRa Module and M252KG6AE GPIO Function List .................................... 16
Table 3-5 Vin Power Source.......................................................................................................... 16
Table 3-6 5 V Power Sources........................................................................................................ 17
Table 3-7 3.3 V Power Sources..................................................................................................... 17
Table 3-8 1.8 V Power Sources..................................................................................................... 17
Table 3-9 Power Connectors ......................................................................................................... 18
Table 3-10 USB Connectors.......................................................................................................... 18
Table 3-11 Power Switches ........................................................................................................... 18
Table 3-12 Supply External Power through Nu-Link2-Me ............................................................. 19
Table 3-13 Supply External Power for M252 Target Board........................................................... 21
Table 3-14 External Reference Voltage Connector....................................................................... 22
Table 3-15 Voltage Adjustable Interface Connector...................................................................... 22
Table 3-16 Battery Voltage Interface Connector............................................................................ 22
Table 3-17 Ammeter Connector..................................................................................................... 22
Table 3-18 Push-Buttons ............................................................................................................... 23
Table 3-19 LEDs ............................................................................................................................ 23
Table 3-20 VCOM Function of Nu-Link2-Me.................................................................................. 24
Table 3-21 Operation Status LED Patterns ................................................................................... 24

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1 OVERVIEW
The NuMaker-LoRaD470/868/915-M252 evaluation board, hereafter referred to as NuMaker-LoRaD-
M252, is used to implement LoRa ecosystem device design for LoRa 915 MHz, 868 MHz, and 470 MHz
frequency band, respectively. The NuMaker-LoRaD-M252 consists of two parts: an M252 target board
and an on-board Nu-Link2-Me debugger and programmer. The NuMaker-LoRaD-M252 is designed for
project evaluation, prototype development and validation with power consumption monitoring function
for LoRa application.
The M252 target board is based on NuMicro M252KG6AE. For the development flexibility, the M252
target board provides the extension connectors of M252KG6AE, LoRa module, the Arduino UNO
compatible headers and the capability of adopting multiple power supplies. Furthermore, the Nuvoton-
designed ammeter connector can measure the power consumption instantly, which is essential for the
LoRa 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.
See Constructing LoRaWAN Network User Manual and NuMaker-LoRaG-NUC980 User Manual for
more information regarding LoRaWAN network between gateway and device and NuMaker-
LoRaG915/LoRaG868-NUC980 evaluation board for LoRaWAN gateway.
NuMaker-LoRaD470-M252 V1.1
Note:
NuMaker-LoRaD915-M252 board for 915 MHz frequency band.
NuMaker-LoRaD868-M252 board for 868 MHz frequency band.
NuMaker-LoRaD470-M252 board for 470 MHz frequency band.
Figure 1-1 NuMaker-LoRaD-M252 Evaluation Board

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2 FEATURES
NuMicro M252KG6AE microcontroller with functions compatible with:
–M252KG6AE
–M251KG6AE
–M252SG6AE
–M251SG6AE
–M252LG6AE
–M251LG6AE
On-board LoRa module:
–RYLR890 for 868/915 MHz (Order Number: NK-LDMM252/NK-LDHM252)
–RYLR400 for 470 MHz (Order Number: NK-LDLM252)
M252KG6AE extension connectors
Arduino UNO compatible extension connectors
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 M252 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
3.1 Front View
ICE USB Connector
VCOM Switch
Reset Button
ICE Status LED
Off-line Program Button
USB FS Connector
Power LED
PB14 LED
VDD Switch
Target Chip: M252KG6AE
Target Chip Extension Connector
Arduino UNO Compatible Extension
Connector
External VDD Connector
Nu-Link2-Me
Ammeter
ICE Chip: M48SSIDAE
External VSS Connector
M252 Target Board
External VREF Connector
LoRa Module
LoRa Antenna
NuMaker-RoLaD470-M252 V1.1
Figure 3-1 Front View of NuMaker-LoRaD-M252
Figure 3-1 shows the main components and connectors from the front side of NuMaker-LoRaD-M252.
The following lists components and connectors from the front view:
Target chip: M252KG6AE (U1)
On-Board LoRa module: RYLR890 or RYLR400 (U2)
LoRa Antenna Connector (J10)
USB FS Connector (J2)
Arduino UNO Compatible Extension Connectors (NU1, NU2, NU3, NU4)
M252 Extension Connectors (JP3, JP4, JP5 and JP6)
External VDD Power Connector (JP1)
External VSS Power Connector (JP2)
External VREF Connector (VREF1)
External VBAT Connector (VBAT)
External VDDIO Connector (VDDIO)
VDD Switch (SW2)
Ammeter Connector (AMMETER)
Reset Button (SW1)
Power LED and PB14 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)

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3.2 Rear View
Figure 3-2 shows the main components and connectors from the rear side of NuMaker-LoRaD-M252.
The following lists components and connectors from the rear view:
Nu-Link2-Me
–MCUVCC Power Switch (ICEJPR1)
–ICEVCC Power Switch (ICEJPR2)
ICEVCC Power Switch
MCUVCC Power
Switch
L
H
M251KG6AE
M251SG6AE
M251LG6AE
M252LG6AE
M252SG6AE
www.nuvoton.com/board/NuMaker-LoRaD470-M252
Order No. NK-LDLM252
Figure 3-2 Rear View of NuMaker-LoRaD-M252

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3.3 Extension Connectors
Table 3-1 presents the extension connectors.
Connector
Description
JP3, JP4, JP5 and JP6
Full pins extension connectors on the NuMaker-LoRaD-M252.
NU1, NU2, NU3 and
NU4
Arduino UNO compatible pins on the NuMaker-LoRaD-M252.
Table 3-1 Extension Connectors
3.3.1 Pin Assignment for Extension Connectors
The NuMaker-LoRaD-M252 provides the M252KG6AE onboard and extension connectors (JP3, JP4,
JP5 and JP6). Figure 3-3 shows the M252KG6AE extension connectors.
JP3
Pin1 ~ Pin16
JP6
Pin49 ~ Pin64
JP5 Pin17 ~ Pin32
JP4 Pin33 ~ Pin48
NuMaker-RoLaD470-M252 V1.1
Figure 3-3 M252KG6AE Extension Connectors

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Header
M252KG6AE
Pin No.
Function
JP3
JP3.1
1
PB.5/EADC0_CH5/ACMP1_N/EBI_ADR0/I2C0_SCL/USCI1_CTL0/SC0_CLK/PWM0_CH0/PSIO0_
CH4/UART2_TXD/TM0/INT0
JP3.2
2
PB.4/EADC0_CH4/ACMP1_P1/EBI_ADR1/I2C0_SDA/USCI1_CTL1/SC0_DAT/PWM0_CH1/PSIO0
_CH5/UART2_RXD/TM1/INT1
JP3.3
3
PB.3/EADC0_CH3/ACMP0_N/EBI_ADR2/I2C1_SCL/UART1_TXD/USCI1_DAT1/SC0_RST/PWM0_
CH2/PSIO0_CH6/PWM0_BRAKE0/TM2/INT2
JP3.4
4
PB.2/EADC0_CH2/ACMP0_P1/OPA0_O/EBI_ADR3/I2C1_SDA/UART1_RXD/USCI1_DAT0/SC0_P
WR/PWM0_CH3/PSIO0_CH7/TM3/INT3
JP3.5
5
PC.12/EBI_ADR4/UART0_TXD/I2C0_SCL/SC0_nCD/PWM1_CH0/ACMP0_O
JP3.6
6
PC.11/EBI_ADR5/UART0_RXD/I2C0_SDA/PWM1_CH1/ACMP1_O
JP3.7
7
PC.10/EBI_ADR6/PWM1_CH2
JP3.8
8
PC.9/EBI_ADR7/PWM1_CH3
JP3.9
9
PB.1/EADC0_CH1/OPA0_N/EBI_ADR8/UART2_TXD/USCI1_CLK/I2C1_SCL/QSPI0_MISO1/PWM
0_CH4/PWM1_CH4/PWM0_BRAKE0
JP3.10
10
PB.0/EADC0_CH0/OPA0_P/EBI_ADR9/UART2_RXD/SPI0_I2SMCLK/I2C1_SDA/QSPI0_MOSI1/P
WM0_CH5/PWM1_CH5/PWM0_BRAKE1
JP3.11
11
VSS
JP3.12
12
VDD
JP3.13
13
PA.11/ACMP0_P0/EBI_nRD/USCI0_CLK/BPWM0_CH0/TM0_EXT
JP3.14
14
PA.10/ACMP1_P0/EBI_nWR/USCI0_DAT0/BPWM0_CH1/TM1_EXT/DAC0_ST
JP3.15
15
PA.9/EBI_MCLK/USCI0_DAT1/UART1_TXD/BPWM0_CH2/TM2_EXT
JP3.16
16
PA.8/EBI_ALE/USCI0_CTL1/UART1_RXD/BPWM0_CH3/TM3_EXT/INT4
JP3.17
17
NC
JP3.18
18
PD.12/EBI_nCS0/UART2_RXD/BPWM0_CH5/CLKO/EADC0_ST/INT5
JP3.19
19
PD.11/EBI_nCS1/UART1_TXD
JP3.20
20
PD.10/EBI_nCS2/UART1_RXD
JP3.21
21
NC
JP3.22
22
NC
JP3.23
23
NC
JP3.24
24
NC
JP3.25
25
NC
JP3.26
26
NC
JP3.27
27
NC
JP3.28
28
PF.7/EBI_ADR18/SC0_DAT/SPI0_MISO
JP3.29
29
PF.6/EBI_ADR19/SC0_CLK/SPI0_MOSI/EBI_nCS0/TAMPER0
JP3.30
30
VBAT
JP3.31
31
PF.5/UART2_RXD/UART2_nCTS/PWM0_CH0/BPWM0_CH4/X32_IN/EADC0_ST
JP3.32
32
PF.4/UART2_TXD/UART2_nRTS/PWM0_CH1/BPWM0_CH5/X32_OUT

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Header
M252KG6AE
Pin No.
Function
JP5
JP5.1
33
NC
JP5.2
34
NC
JP5.3
35
NC
JP5.4
36
NC
JP5.5
37
PF.3/EBI_nCS0/UART0_TXD/I2C0_SCL/XT1_IN/BPWM1_CH0
JP5.6
38
PF.2/EBI_nCS1/UART0_RXD/I2C0_SDA/QSPI0_CLK/XT1_OUT/BPWM1_CH1
JP5.7
39
NC
JP5.8
40
NC
JP5.9
41
PE.8/EBI_ADR10/USCI1_CTL1/UART2_TXD/PWM0_CH0/PWM0_BRAKE0
JP5.10
42
PE.9/EBI_ADR11/USCI1_CTL0/UART2_RXD/PWM0_CH1/PWM0_BRAKE1
JP5.11
43
PE.10/EBI_ADR12/USCI1_DAT0/PWM0_CH2/PWM1_BRAKE0
JP5.12
44
PE.11/EBI_ADR13/USCI1_DAT1/UART1_nCTS/PWM0_CH3/PWM1_BRAKE1
JP5.13
45
PE.12/EBI_ADR14/USCI1_CLK/UART1_nRTS/PWM0_CH4
JP5.14
46
PE.13/EBI_ADR15/I2C0_SCL/UART1_TXD/PWM0_CH5/PWM1_CH0/BPWM1_CH5
JP5.15
47
PC.8/EBI_ADR16/I2C0_SDA/UART1_RXD/PWM1_CH1/BPWM1_CH4
JP5.16
48
PC.7/EBI_AD9/UART0_nCTS/I2C1_SMBAL/PWM1_CH2/BPWM1_CH0/TM0/INT3
JP5.17
49
PC.6/EBI_AD8/UART0_nRTS/I2C1_SMBSUS/PWM1_CH3/BPWM1_CH1/TM1/INT2
JP5.18
50
PA.7/EBI_AD7/UART0_TXD/I2C1_SCL/PWM1_CH4/BPWM1_CH2/ACMP0_WLAT/TM2/INT1
JP5.19
51
PA.6/EBI_AD6/UART0_RXD/I2C1_SDA/PWM1_CH5/BPWM1_CH3/ACMP1_WLAT/TM3/INT0
JP5.20
52
VSS
JP5.21
53
VDD
JP5.22
54
PD.15/PSIO0_CH7/PWM0_CH5/TM3/INT1
JP5.23
55
PA.5/QSPI0_MISO1/UART0_nCTS/UART0_TXD/I2C0_SCL/BPWM0_CH5/PWM0_CH0
JP5.24
56
PA.4/QSPI0_MOSI1/SPI0_I2SMCLK/SC0_nCD/UART0_nRTS/UART0_RXD/I2C0_SDA/USCI2_CT
L1/BPWM0_CH4/PWM0_CH1
JP5.25
57
PA.3/QSPI0_SS/SPI0_SS/SC0_PWR/I2C0_SMBAL/UART1_TXD/I2C1_SCL/PSIO0_CH4/USCI2_C
TL0/BPWM0_CH3/PWM0_CH2/CLKO/PWM1_BRAKE1
JP5.26
58
PA.2/QSPI0_CLK/SPI0_CLK/SC0_RST/I2C0_SMBSUS/UART1_RXD/I2C1_SDA/PSIO0_CH5/USCI
2_CLK/BPWM0_CH2/PWM0_CH3
JP5.27
59
PA.1/QSPI0_MISO0/SPI0_MISO/SC0_DAT/UART0_TXD/UART1_nCTS/PSIO0_CH6/USCI2_DAT0
/BPWM0_CH1/PWM0_CH4
JP5.28
60
PA.0/QSPI0_MOSI0/SPI0_MOSI/SC0_CLK/UART0_RXD/UART1_nRTS/PSIO0_CH7/USCI2_DAT1
/BPWM0_CH0/PWM0_CH5/DAC0_ST
JP5.29
61
VDDIO
JP5.30
62
PE.14/EBI_AD8/UART2_TXD/PSIO0_CH0
JP5.31
63
PE.15/EBI_AD9/UART2_RXD/PSIO0_CH1
JP5.32
64
nRESET
Note: It is recommended to use 10 kΩ pull-up resistor and 10 uF capacitor on nRESET pin.
JP4
JP4.1
65
PF.0/UART1_TXD/I2C1_SCL/UART0_TXD/BPWM1_CH0/ICE_DAT

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Header
M252KG6AE
Pin No.
Function
Note: It is recommended to use 100 kΩpull-up resistor on ICE_DAT pin.
JP4.2
66
PF.1/UART1_RXD/I2C1_SDA/UART0_RXD/BPWM1_CH1/ICE_CLK
Note: It is recommended to use 100 kΩpull-up resistor on ICE_CLK pin.
JP4.3
67
PD.9/EBI_AD7/UART2_nCTS/PSIO0_CH2
JP4.4
68
PD.8/EBI_AD6/UART2_nRTS/PSIO0_CH3
JP4.5
69
PC.5/EBI_AD5/QSPI0_MISO1/UART2_TXD/I2C1_SCL/PWM1_CH0/PSIO0_CH0
JP4.6
70
PC.4/EBI_AD4/QSPI0_MOSI1/UART2_RXD/I2C1_SDA/PWM1_CH1/USCI2_CTL1/PSIO0_CH1
JP4.7
71
PC.3/EBI_AD3/QSPI0_SS/UART2_nRTS/I2C0_SMBAL/PWM1_CH2/USCI2_CTL0/PSIO0_CH2
JP4.8
72
PC.2/EBI_AD2/QSPI0_CLK/UART2_nCTS/I2C0_SMBSUS/PWM1_CH3/USCI2_CLK/PSIO0_CH3
JP4.9
73
PC.1/EBI_AD1/QSPI0_MISO0/UART2_TXD/I2C0_SCL/PWM1_CH4/USCI2_DAT0/ACMP0_O
JP4.10
74
PC.0/EBI_AD0/QSPI0_MOSI0/UART2_RXD/I2C0_SDA/PWM1_CH5/USCI2_DAT1/ACMP1_O
JP4.11
75
VSS
JP4.12
76
VDD
JP4.13
77
NC
JP4.14
78
NC
JP4.15
79
NC
JP4.16
80
NC
JP4.17
81
NC
JP4.18
82
NC
JP4.19
83
NC
JP4.20
84
PD.7/UART1_TXD/I2C0_SCL/USCI1_CLK/PSIO0_CH4
JP4.21
85
PD.6/UART1_RXD/I2C0_SDA/USCI1_DAT1/PSIO0_CH5
JP4.22
86
PD.5/I2C1_SCL/USCI1_DAT0/PSIO0_CH6
JP4.23
87
PD.4/USCI0_CTL0/I2C1_SDA/USCI1_CTL1/PSIO0_CH7
JP4.24
88
PD.3/EBI_AD10/USCI0_CTL1/SPI0_SS/USCI1_CTL0/UART0_TXD
JP4.25
89
PD.2/EBI_AD11/USCI0_DAT1/SPI0_CLK/UART0_RXD
JP4.26
90
PD.1/EBI_AD12/USCI0_DAT0/SPI0_MISO
JP4.27
91
PD.0/EBI_AD13/USCI0_CLK/SPI0_MOSI/TM2
JP4.28
92
PD.13/EBI_AD10/SPI0_I2SMCLK/USCI2_CTL0
JP4.29
93
USB_VBUS
JP4.30
94
USB_D-
JP4.31
95
USB_D+
JP4.32
96
USB_VDD33_CAP
JP6
JP6.1
97
PE.7/PSIO0_CH0/PWM0_CH0/BPWM0_CH5
JP6.2
98
PE.6/SC0_nCD/USCI0_CTL0/PSIO0_CH1/PWM0_CH1/BPWM0_CH4

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Header
M252KG6AE
Pin No.
Function
JP6.3
99
PE.5/EBI_nRD/SC0_PWR/USCI0_CTL1/PSIO0_CH2/PWM0_CH2/BPWM0_CH3
JP6.4
100
PE.4/EBI_nWR/SC0_RST/USCI0_DAT1/PSIO0_CH3/PWM0_CH3/BPWM0_CH2
JP6.5
101
PE.3/EBI_MCLK/SC0_DAT/USCI0_DAT0/PWM0_CH4/BPWM0_CH1
JP6.6
102
PE.2/EBI_ALE/SC0_CLK/USCI0_CLK/USCI2_CTL0/PWM0_CH5/BPWM0_CH0
JP6.7
103
NC
JP6.8
104
NC
JP6.9
105
PE.1/EBI_AD10/QSPI0_MISO0/I2C1_SCL/USCI2_DAT1
JP6.10
106
PE.0/EBI_AD11/QSPI0_MOSI0/I2C1_SDA/USCI2_DAT0
JP6.11
107
NC
JP6.12
108
NC
JP6.13
109
NC
JP6.14
110
NC
JP6.15
111
NC
JP6.16
112
VSS
JP6.17
113
LDO_CAP
JP6.18
114
VDD
JP6.19
115
PC.14/EBI_AD11/SPI0_I2SMCLK/USCI0_CTL0/QSPI0_CLK/USCI2_CLK/TM1
JP6.20
116
PB.15/EADC0_CH15/EBI_AD12/SPI0_SS/USCI0_CTL1/UART0_nCTS/PSIO0_CH0/PWM1_CH0/T
M0_EXT/PWM0_BRAKE1
JP6.21
117
PB.14/EADC0_CH14/EBI_AD13/SPI0_CLK/USCI0_DAT1/UART0_nRTS/PSIO0_CH1/PWM1_CH1/
TM1_EXT/CLKO
JP6.22
118
PB.13/EADC0_CH13/ACMP0_P3/ACMP1_P3/EBI_AD14/SPI0_MISO/USCI0_DAT0/UART0_TXD/P
SIO0_CH2/PWM1_CH2/TM2_EXT
JP6.23
119
PB.12/EADC0_CH12/DAC0_OUT/ACMP0_P2/ACMP1_P2/EBI_AD15/SPI0_MOSI/USCI0_CLK/UA
RT0_RXD/PSIO0_CH3/PWM1_CH3/TM3_EXT
JP6.24
120
AVDD
JP6.25
121
VREF
JP6.26
122
AVSS
JP6.27
123
PB.11/EADC0_CH11/EBI_ADR16/UART0_nCTS/I2C1_SCL/SPI0_I2SMCLK/BPWM1_CH0
JP6.28
124
PB.10/EADC0_CH10/EBI_ADR17/USCI1_CTL0/UART0_nRTS/I2C1_SDA/BPWM1_CH1
JP6.29
125
PB.9/EADC0_CH9/EBI_ADR18/USCI1_CTL1/UART0_TXD/UART1_nCTS/I2C1_SMBAL/BPWM1_
CH2
JP6.30
126
PB.8/EADC0_CH8/EBI_ADR19/USCI1_CLK/UART0_RXD/UART1_nRTS/I2C1_SMBSUS/BPWM1_
CH3
JP6.31
127
PB.7/EADC0_CH7/EBI_nWRL/USCI1_DAT0/UART1_TXD/EBI_nCS0/BPWM1_CH4/PWM1_BRAK
E0/PWM1_CH4/INT5/ACMP0_O
JP6.32
128
PB.6/EADC0_CH6/EBI_nWRH/USCI1_DAT1/UART1_RXD/EBI_nCS1/BPWM1_CH5/PWM1_BRAK
E1/PWM1_CH5/INT4/ACMP1_O
Table 3-2 M252KG6AE Full-pin Extension Connectors and GPIO Function List

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3.3.2 Arduino UNO Compatible Extension Connectors
Figure 3-4 shows the Arduino UNO compatible extension connectors.
MISO CLK RESET SS
PA.9 PA.11 nRESET PA.8
USCI0_DAT1 USCI0_CLK
5V MOSI GND -
VDD PA.10 VSS PB.15
USCI0_DAT0
PWM0_CH0 PA.5 D8
PWM0_CH1 PA.4 D9
SPI0_SS PWM0_CH2 PA.3 D10
SPI0_MOSI PWM0_CH5 PA.0 D11
SPI0_MISO PWM0_CH4 PA.1 D12
SPI0_CLK PWM0_CH3 PA.2 D13
VSS VSS
VREF VREF
UART2_RXD I2C0_SDA PC.0 SDA
UART2_TXD I2C0_SCL PC.1 SCL
UART1_RXD PWM0_CH3 PB.2 D0
UART1_TXD PWM0_CH2 PB.3 D1
I2C1_SDA PWM1_CH1 PC.4 D2
I2C1_SCL PWM1_CH0 PC.5 D3
PWM1_CH2 PC.3 D4
PWM1_CH3 PC.2 D5
PWM1_CH4 PA.7 D6
PWM1_CH5 PA.6 D7
VIN
VSS
VSS
5V
3V
RST
IOREF VDD
NC
A5 PB.1 EADC0_CH1 I2C1_SCL UART2_TXD
A4 PB.0 EADC0_CH0 I2C1_SDA UART2_RXD
A3 PB.4 EADC0_CH4
A2 PB.5 EADC0_CH5
A1 PB.6 EADC0_CH6
A0 PB.7 EADC0_CH7
NuMaker-RoLaD470-M252 V1.1
Figure 3-4 Arduino UNO Compatible Extension Connectors

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Header
NuMaker-LoRaD-M252
Header
NuMaker-LoRaD-M252
Compatible to
Arduino UNO
GPIO Pin of M252
Compatible to
Arduino UNO
GPIO Pin of M252
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
VREF
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 3-3 Arduino UNO Extension Connectors and M252KG6AE Mapping GPIO List

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3.4 Pin Assignment for On-board LoRa Module
The NuMaker-LoRaD-M252 provides an on-board LoRa module. Table 3-1 shows the mapping GPIO
list.
On-board LoRa Module
NuMaker-LoRaD-M252
Function of GPIO Pin
GPIO Pin of M252KG6AE
LoRa
MISO
SPI0_MISO
PD.1
MOSI
SPI0_MOSI
PD.0
SCK
SPI0_CLK
PD.2
NSS
SPI0_SS
PD.3
NRST
GPIO
PF.6
DIO0
GPIO
PC.6
DIO1
GPIO
PC.7
DIO2
GPIO
PB.8
DIO3
GPIO
PB.9
DIO4
GPIO
PB.10
DIO5
GPIO
PB.11
Table 3-4 On-board LoRa Module and M252KG6AE GPIO Function List
3.5 Power Supply Configuration
The NuMaker-LoRaD-M252 is able to adopt multiple power supplies. External power sources include
NU1 Vin (7 V to 12 V), VDD (depending on the target chip operating voltage and LoRa module operation
voltage), and PC through USB connector. By using switches and voltage regulator, multiple power
domains can be created on the NuMaker-LoRaD-M252.
3.5.1 VIN Power Source
Table 3-5 presents the Vin power source.
Connector
Net Name in
Schematic
Description
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 NU1_5VCC.
Table 3-5 Vin Power Source

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3.5.2 5 V Power Sources
Table 3-6 presents the 5 V power sources.
Connector
Net Name in
Schematic
Description
ICEJ3
USB_HS_VBUS
ICE USB connector supplies 5 V power from PC to
M252 target board and Nu-Link2-Me.
J2
USB_VBUS
USB connector on NuMaker-LoRaD-M252 supplies 5 V
power from PC to M252 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 target chip or Arduino
adapter board.
Note: LoRa module operating voltage range is from 1.8
V to 3.6 V. Do not switch SW2.1 (NU1 5VCC) to ON.
Table 3-6 5 V Power Sources
3.5.3 3.3 V Power Sources
Table 3-7 presents the 3.3 V power sources.
Voltage
Regulator
5 V Source
Description
ICEUP1
USB_HS_VBUS
ICEUP1 converts USB_HS_VBUS to 3.3 V and
supplies 3.3 V to M252 target board or ICE chip.
UP1
USB_VBUS
UP1 converts USB_VBUS to 3.3 V and supplies 3.3 V
to M252 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 M252 target board.
Note: SW2.2 (NU1 3VCC) should be switched to ON.
Table 3-7 3.3 V Power Sources
3.5.4 1.8 V Power Sources
Table 3-8 presents the 1.8 V power source.
Voltage Regular
5V Source
Description
ICEUP2
USB_HS_VBUS
ICEUP2 converts USB_HS_VBUS to 1.8 V and
supplies 1.8 V to M252 target board or ICE chip.
Table 3-8 1.8 V Power Sources

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3.5.5 Power Connectors
Table 3-9 presents the power connectors.
Connector
Description
JP1
VDD connector on the NuMaker-LoRaD-M252.
Note: LoRa module operating voltage range is from 1.8 V to 3.6 V.
JP2
VSS connector on the NuMaker-LoRaD-M252.
Table 3-9 Power Connectors
3.5.6 USB Connectors
Table 3-10 presents the USB connectors.
Connector
Description
ICEJ3
ICE USB connector on Nu-Link2-Me for power supply, debugging and
programming from PC.
J2
USB FS connector on NuMaker-LoRaD-M252 for power supply.
Table 3-10 USB Connectors
3.5.7 Power Switches
Table 3-11 presents the power switches.
Switch
Description
ICEJPR1
Configures the target chip operating voltage at 1.8 V / 3.3 V / 5 V.
Note: LoRa module operating voltage range is from 1.8 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 operating voltage at 3.3 V / 5 V.
Note: LoRa module operating voltage range is from 1.8 V to 3.6 V. Do
not switch SW2.1 (NU1 5VCC) to ON.
Table 3-11 Power Switches

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3.5.8 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 3-5.
ICE USB Connector
(ICEJ3)
Nu-Link2-Me
NuMaker-RoLaD470-M252 V1.1
Figure 3-5 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:
Solder the resistor on ICEJPR1 (MCUVCC) depending on the target chip operating voltage.
Solder the resistor on ICEJPR2 (ICEVCC) depending on the ICE chip operating voltage.
Switch the SW2 to OFF.
Connect the external power supply to ICEJ3.
Table 3-12 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
-
-
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
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.
3. -: Unused.
Table 3-12 Supply External Power through Nu-Link2-Me

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External Power Supply through M252 Target Board to Target Chip
The external power supply sources on M252 target board are shown in Figure 3-6.
USB Power Connector
(J2)
NU1 pin8 (Vin)
External VDD Connector
(JP1)
External VSS Connector
(JP2)
NuMaker-RoLaD470-M252 V1.1
Figure 3-6 External Power Supply Sources on M252 Target Board
To use Vin or J2 as external power supply source, please follow the steps below:
Switch the SW2 depending on the target chip operating voltage.
Remove the resistor on ICEJPR1 (MCUVCC).
Solder the resistor on ICEJPR2 (ICEVCC) depending on the ICE chip operating voltage.
Connect the external power supply to Vin or J2.
To use JP1 as external power supply source, please follow the steps below:
Switch the SW2 to OFF.
Remove the resistor on ICEJPR1 (MCUVCC).
Solder the resistor on ICEJPR2 (ICEVCC) depending on the ICE chip operating voltage.
Connect ICEJ3 to PC.
Connect the external power supply to JP1.
To use Vin or J2 as external power supply source with Nu-Link2-Me detached from NuMaker-LoRaD-
M252, please follow the steps below:
Switch the SW2 depending on the target chip operating voltage.
Detach the Nu-Link2-Me from NuMaker-LoRaD-M252.
Connect the external power supply to Vin or J2.
To use JP1 as external power supply source with Nu-Link2-Me detached from NuMaker-LoRaD-
M252, please follow the steps below:
Switch the SW2 to OFF.
Detach the Nu-Link2-Me from NuMaker-LoRaD-M252.
Connect the external power supply to JP1.