M8 Accessories(004)

M8 Pinouts

M8 Connector Wire End

M8 Connector on cable

Facing sockets on connector end of cable

M8 Connector Panel

M8 Connector on Tracker One

Facing pins on the panel connector from the outside of the case

The 8-pin connector has these signals:

M8 Pin Function Function Function I/O Color
1 CAN_P IO2 Yellow
2 VIN3 I Red
3 Analog A3 GPIO D3 IO1 White
4 Serial1 RX Wire3 SDA GPIO D9 IO1 Green
5 Serial1 TX Wire3 SCL GPIO D8 IO1 Brown
6 CAN_5V4 CAN_PWR O Orange
7 CAN_N IO2 Blue
8 GND Black

1MCU GPIO is limited to 3.3V maximum.

2CAN Bus specifications can be found in the Tracker SoM datasheet.

36.0 to 30 VDC at 2A when using the M8 connector.

45V, 370 mA maximum. Controlled by the CAN_PWR GPIO.

You typically connect the cable to your custom external interface device by routing the cable through a cable gland in your enclosure and to your custom board and:

  • Terminate with pins in a PHR-8 to mate with a B8B-PH on your expansion board
  • Terminate with screw terminals on your board
  • Terminate by soldering the wires to your board

For more information on expanding your Tracker One using the M8 connector, see the Tracker One Expansion Tutorials.

You must enable CAN_5V in order to use GPIO on M8 pins 3, 4, and 5 (A3, D9/RX/SDA, D8/TX/SCL) on the Tracker One. If CAN_5V is not powered, these pins are isolated from the MCU starting with version 1.1 of the Tracker One/Tracker Carrier Board (September 2020 and later). This is necessary to prevent an issue with shipping mode, see technical advisory note TAN002.

M8 Cables

M8 Straight

M8 Right Angle

The M8 cables provide a convenient way to connect external devices to the Tracker One while preserving the IP67 waterproof rating and not having to disassemble the Tracker One.


Wire Gauge - M8 Cables

M8 Pin Function Color Wire Gauge
1 CAN_P Yellow 26 AWG
2 VIN Red 24 AWG
3 A3 White 26 AWG
4 RX_SDA_D9 Green 26 AWG
5 TX_SCL_D8 Brown 26 AWG
6 CAN_5V Orange 26 AWG
7 CAN_N Blue 26 AWG
8 GND Black 24 AWG

Dimensions - M8 Cables

M8 Straight
M8 Right Angle
Parameter Value
Length 1 meter ±3 cm
Outer jacket stripped 10 cm ±1 cm
Inner wires stripped and tinned 5 mm ±1 mm
Outer Diameter 5.0 mm
Approvals UL2464, RoHS

Orientation - M8 Cables

The key on the M8 panel connector is at 3 o'clock (right side, nearest to the USB connector), when facing the connectors, as in the diagram above. When using the right-angle M8 cable, the cable will face away from the USB connector.

Cable Orientation

SKUs - M8 Cables

SKU Description
ONEM8CABEA Tracker One M8 Accessory Cable (Straight), (x1)
ONEM8CABTY Tracker One M8 Accessory Cable (Straight), (x40)
ONEM8CABRAEA Tracker One M8 Accessory Cable (Right Angle), (x1)
ONEM8CABRATY Tracker One M8 Accessory Cable (Right Angle), (x40)

M8 Connector

The ONEM8CONN is a connector similar to the M8 connector on the straight ONEM8CAB. It's intended for building your own M8 cable assembly and is the female side of the connector that mates with the Tracker One M8 connector. It is a bare connector and does not include a shroud. It is intended that your cable manufacturer will add an overmould to seal your cable to the connector.

M8 Connector M8 Connector

SKUs - M8 Connector

SKU Description
ONEM8CONNEA Tracker One M8 Connector (Straight), (x1)
ONEM8CONNTY Tracker One M8 Connector (Straight), (x40)

This connector has the same pinouts as the cable above, but without the cable, so you can substitute your own cable of the desired length.

Other Sensors

M8 Temperature/Humidity

M8 Sensor Temperature/Humidity

Revision history

Revision Date Author Comments
001 2020 Sep 15 RK First release
002 2021 Feb 03 RK Change M8 CAN output current to 370 mA
003 2021 Feb 10 RK Update picture of ONEM8CONN
004 2021 Feb 17 RK Add note about Tracker One M8 GPIO requiring CAN_5V