Table 11. Arduino Nano Connectors On Nucleo-L031K6 - ST STM32 NUCLEO-F042K6 User Manual

Hardware layout and configuration
Connector Pin number
CN3
CN4
CN4
1. Only one USART is available and it is shared between Arduino Nano and VCP. the selection is done by
remapping (no hardware configuration to change).
2. Limitations on A4 and A5, D4 and D5 related to I2C configuration are explained in
bridges
3. D7/D8 shared with OSC32_IN/OSC32_OUT.
4. SPI_CS is made by GPIO.
5. PA2 exclusive with VCP_TX.
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Table 11. Arduino Nano connectors on NUCLEO-L031K6

Pin name
1
2
3 RESET
4 GND
5
6
7 D4
8 D5
9
10 D7
11 D8
12
13
14
15
1
2 GND
3 RESET
4
5
6
7 A5
8 A4
9
10
11
12
13 AREF
14 +3V3
15
according to SB16/SB18 setting.
DocID028406 Rev 1
STM32 Pin
Left connector
D1 PA9
D0 PA10
NRST
-
D2 PA12
D3 PB0
(2)
PB7
(2)
PB6
D6 PB1
(3)
PC14
(3)
PC15
D9 PA8
D10 PA11
D11 PB5
D12 PB4
Right connector
VIN -
-
NRST
+5V -
A7 PA2
A6 PA7
(2)
PA6
(2)
PA5
A3 PA4
A2 PA3
A1 PA1
A0 PA0
-
-
D13 PB3
Function
(1)
USART2_TX
(1)
USART2_RX
RESET
Ground
-
TIM2_CH3
-
TIM21_CH1
TIM2_CH4
-
-
TIM2_CH1
(4)
SPI_CS || TIM21_CH2
SPI1_MOSI || TIM22_CH2
SPI1_MISO
Power input
Ground
RESET
5V input/output
(5)
ADC_IN2
ADC_IN7
ADC_IN6 || I2C1_SCL
ADC_IN5 || I2C1_SDA
ADC_IN4
ADC_IN3
ADC_IN1
ADC_IN0
AVDD
3.3V input/output
SPI1_SCK
Section 6.8: Solder
UM1956