Arduino® Nicla Voice
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Arduino® Nicla Voice
Modified: 05/01/2023
5.7 Board Recovery
All Arduino® boards have a built-in bootloader which allows flashing the board via USB. In case a sketch locks up
the processor and the board is not reachable anymore via USB, it is possible to enter bootloader mode by double-
tapping the reset button right after power up.
6 Connector Pinouts
All the pins on J1 and J2 (excluding fins) are referenced to the V
DDIO_EXT
voltage which can be generated internally
or supplied externally.
6.1 J1 Nicla Header A
Pin
Function
Type
Description
MKR Compatibility
1
LPIO0_EXT
Digital
Low Power IO Pin 0
A6
2
NC
N/A
N/A
A5
3
CS
Digital
SPI Cable Select
A4
4
COPI
Digital
SPI Controller Out / Peripheral In
A3
5
CIPO
Digital
SPI Controller In / Peripheral Out
A2
6
SCLK
Digital
SPI Clock
A1
7
ADC2
Analog
Analog Input 2
A0
8
ADC1
Analog
Analog Input 1
AREF
6.2 J2 Nicla Header B
Pin
Function
Type
Description
MKR Compatibility
1
SDA
Digital
I2C Data Line
SDA
2
SCL
Digital
I2C Clock
SCL
3
LPIO1_EXT
Digital
Low Power IO Pin 1
RX
4
LPIO2_EXT
Digital
Low Power IO Pin 2
TX
5
LPIO3_EXT
Digital
Low Power IO Pin 3
RESET
6
GND
Power
Ground
GND
7
VDDIO_EXT
Digital
Logic Level Reference
3.3 V
8
N/C
N/A
N/A
VIN
9
VIN
Digital
Input Voltage
5V
Note: For further information on how Low Power I/Os work, check Nicla Family Form Factor documentation.
