2. V2 GNSS (NEO-M8N) MAG BARO hardware [revision 2.3.2]

This page covers hardware-specific details of GNSS module witch also includes magnetometer and barometer. For general information, see 1. General, for software related details see Cyphal interface or DroneCAN interface.

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2.1. Features

• Concurrent reception of GPS, GLONASS, Galileo and BeiDou
• Centimeter-level accuracy in a small and energy-efficient module
• Easy integration
• Magnetometer RM3100 (opens new window)
• Baro BMP280 (opens new window)
• 2 JST SM04B connectors compatible with Dronecode Autopilot Connector Standard (opens new window)
• 1 MOLEX (opens new window) non standart connector
• GNSS module NEO-M8N (opens new window)
• RHCP Ceramic GPS Antenna (1461680001) (opens new window)

2.2 Wiring

Schematic features. Schematic can be provided via issue.

Connectors

The node has 3 connectors which are described in the table below.

№	Connector	Description
1	CAN1, CAN2	Devices that deliver power to the bus are required to provide 4.5–5.5 V on the bus power line, 5.0 V nominal. Devices that are powered from the bus should expect 4.5–5.5 V on the bus power line. The current shall not exceed 1 A per connector.
2	SWD	STM32 firmware updating using programmer-sniffer.
3	CAN3	Can be powered from 5.5 to 30 volts and connected to CAN.
4	UART	Can be used to setup the GPS module

Here (opens new window) you can find manufacturer part number of connectors it self and its mates.

Pin configuration and functions

Pin	CAN3	Pin	CAN1, CAN2	SWD	UART
1	Vin	1	5V in	GND	5V
2	Vin	2	CAN High	SWCLK	TXO
3	CAN High	3	CAN Low	SWDIO	RXI
4	CAN Low	4	GND	3.3V	GND
5	GND
6	GND

Here you can see all connections of MCU.

2.3. Specifications

Mechanical

Scheme is shown on the picture below. CAN model can be provided via email request or issue on github or downloaded on GrabCAD (opens new window).

	Width, mm	Length, mm	Height, mm
Outline	70	61.3	12.6
PCB	70	61.3	1.6

Total weight of device less than 50 g.

Housing

Information about case presented here.

Absolute Maximum Ratings

Parameter	MIN	MAX	UNIT
Vin (CAN1)	5.5	55*	V
V (CAN2, CAN3)	4.5	5.5	V
I max			A
Operating temperature

*Noted Voltage should be delivered only with current limitation under 2.5 Amp.

Recommended operating conditions

Parameter	Value	UNIT
Vin (CAN3)	30	V
V (CAN1, CAN2)	5	V
I max		A

ESD ratings

Description	Value	UNIT
Human-body model (HBM)	2000	V
Charged-device model (CDM)	500	V

2.4. Integration

Recommended mechanical mounting

Connection example diagram

2.5. Power Supply Recommendations

Device is designed to operate from an input voltage supply range between 4.5 V and 5.5 V over CAN2 or CAN3 connector, or 5.5 - 30 V from CAN1. This input supply must be able to withstand the maximum input current and maintain a stable voltage. The resistance of the input supply rail should be low enough that an input current transient does not cause a high enough drop that can cause a false UVLO fault triggering and system reset. The amount of bulk capacitance is not critical, but a 47-μF or 100-μF electrolytic capacitor is a typical choice.

2.6. Revision history

View	Version	Description
	v3.0.0 Summer, 2023	The board is on the testing stage. - Migrate to stm32g0 from stm32f103
	v2.5.0 27 Mar, 2023	The latest stable version. - Timepulse and EXTINT pin wired to connector CC and connected to MCU - Slightly increase the board size - Fix UART connector
	v2.3.2 (opens new window) Oct 14, 2022	The version of the board with a small bug on UART connector. It is not on production. - Integrate RM3100 in PCB - Assign SS pin to PA2 - Add UART connector with wrong pinout!!! - Use RGB LEDs instead of address LEDs
	v2.3.0 Aug 10, 2021	The first stable version. Do not use it in a new design. - Ingegrage RM3100 - Assign SS pin to PA4 (so RM3100 doesn't work on the lastest firmware) - Address LEDs (so they don't work on the lastest firmware)