Particle Monitor One Manual page 25

ADC
Pin Name
TSOM_A7 / D7
TSOM_A6 / D6
TSOM_A5 / D5
TSOM_A4 / D4
TSOM_A2_BUTTON / D2
TSOM_A3_BATT_TEMP /
D3
On the Monitor One, you should not use A2 and A3 as analog inputs as they are used by the
external user button and battery temperature thermistor.
SPI
Pin Name
TSOM_A6 / D6 A6 Analog in, GPIO D6, PWM, SPI (SCK) SPI (SCK)
TSOM_A5 / D5 A5 Analog in, GPIO D5, PWM, SPI MISO SPI (MISO) 40
TSOM_A4 / D4 A4 Analog in, GPIO D4, PWM, SPI MOSI SPI (MOSI) 41
Any available GPIO can be used as a SPI CS/SS pin.
I2C
Pin Name
TSOM_A0_SDA / D0 Wire SDA
TSOM_A1_SCL / D1
RX / D9
TX / D8
On the Monitor One, pins A0 and A1 are used in I2C mode by the user RGB LED and temperature
sensor. Pins A0 and A1 cannot be used as GPIO.
On the Monitor One (and Tracker SoM), Wire and Wire3 are two different I2C peripherals and
can be used at the same time.
On the Monitor One (and Tracker SoM), Wire3 and Serial1 share the same pins and only one
can be used at a time.
I2C is 3.3V only and is not 5V tolerant.
There are 4.7K pull-up resistors on TSOM_A0_SDA and TSOM_A1_SCL to 3.3V on the base board.
SERIAL (UART)
Pin Name Description
RX / D9
TX / D8
On the Monitor One (and Tracker SoM), Wire3 and Serial1 share the same pins and only one
can be used at a time.
Hardware flow control is not available on the Monitor One.
Serial pins are 3.3V only and are not 5V tolerant.
Additional interface chips are required for other serial standards such as RS232 and RS485.
Description
A7 Analog in, GPIO D7, PWM, SPI SS, WKP
A6 Analog in, GPIO D6, PWM, SPI (SCK)
A5 Analog in, GPIO D5, PWM, SPI MISO
A4 Analog in, GPIO D4, PWM, SPI MOSI
External user button, A2 Analog in, GPIO D2, PWM
Battery temperature sensor, A3 Analog in, GPIO D3,
PWM
Description
Description
Wire SCL
Serial1 RX, GPIO D9, PWM, Wire3 SDA Wire3 (SDA) 71
Serial1 TX, GPIO D8, PWM, Wire3 SCL
Serial1 RX, GPIO D9, PWM, Wire3 SDA Serial1 RX 71
Serial1 TX, GPIO D8, PWM, Wire3 SCL
Interface
ADC3
ADC2
ADC5
ADC7
ADC4
ADC6
Interface SoM Pin MCU
39 P0.04
P0.29
P0.29
Interface SoM Pin MCU
Wire (SDA) 55 P0.03
Wire (SCL) 56 P0.02
P0.08
Wire3 (SCL) 72 P0.06
Interface SoM Pin MCU
P0.08
Serial1 TX 72 P0.06
SoM
Pin MCU
38 P0.05
39 P0.04
40 P0.29
41 P0.29
57 P0.28
58 P0.30