Electrical

Pin Definitions

All pins referred to in the tables below can be found on the MAIN and AUX connectors.

See Main/Aux for more details. Pin number MAIN AUX 1 USB D- USB D- 2 USB D+ USB D+ 3 V primary (4.2-16V DC) V primary (4.2-16V DC) 4 RS-232 Rx RS-232 Rx 5 RS-232 Tx RS-232 Tx 6 V auxiliary (4.2-16V DC) V auxiliary (4.2-16V DC) 7 GPIO 1 GPIO 3 8 Ground Ground 9 GPIO 2 GPIO 4

See User GPIO for details on how to use the GPIO pins and supported features.

 

Absolute Maximum Ratings

Exposure to stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to the Absolute Maximum Ratings for extended periods may affect device reliability and lifetime. Absolute Maximum Ratings are stress ratings only and do not imply functional operation of the device under any conditions beyond those listed in Recommended Operating Conditions.

Pin	Specification(1)	Notes	Min	Max	Units
Vpri	Input Voltage	Also protected against ESD and other high-voltage / low-energy transients.	-0.3	24	V
Vaux			-0.3	24	V
RS-232 Tx	Input Voltage		-15	15	V
RS-232 Rx			-25	25	V
USB D-	Input Voltage		-0.3	7	V
USB D+			-0.3	7	V
GPIOs	Input Voltage Range	Device powered off or internal pullup enabled	-0.3	3	V
		Device powered on and internal pullup disabled	-0.3	6.0	V
	Input Injection Current	GPIO not set to output	-5	5	mA
	Output Current	GPIO set to output	-25	25	mA
GNSS Antenna Ports	DC Load Current		0	100	mA

Notes:

1. All voltages referenced to ground.

 

Recommended Operating Conditions

Stresses beyond the limits in Recommended Operating Conditions will likely result in the improper functioning of the device. The voltages in Recommended Operating Conditions represent voltages as measured at the pins; they do not account for voltage drops in the cable.

Pin	Specification(1)	Notes	Min	Typ	Max	Units
Vpri	Input Voltage Range		4.2		16	V
Vaux	Input Voltage Range		4.2		16	V
USB D-	Input Voltage	Connect to USB host only, or leave disconnected	0		5.5	V
USB D+			0		5.5	V
GPIOs	Input Voltage Range	Device ON, pullup disabled	0		5	V
	Load Capacitance	Any output mode		5		pF
	Output Current		-8		8	mA
Antenna ports	DC Load Current				50	mA

1. All voltages referenced to ground.

 

Power Requirements

The 3DM-GQ7 can be powered through either the Vpri or Vaux pin. See Powering for details.

Specification	Notes	Min	Typ	Max	Units
Operating Voltage	As measured at Vpri or Vaux pin. Does not account for voltage drops in the cable.	4.2		16	V
Power Consumption			2.0	2.5	W

 

Electrical Characteristics

Pin	Specification(1)	Notes	Min	Typ	Max	Units
RS-232 Tx	Output High		5	6.2		V
	Output Low			-5.7	-5	V
RS-232 Rx	Input High Threshold			1.7	2.5	V
	Input Low Threshold		0.8	1.3		V
GPIOs	Output Low Voltage	Any output mode	0.0	0.0	0.36	V
	Output High Voltage		1.4	3.0	3.0	V
	Non-PPS input low threshold				1.12	V
	Non-PPS input high threshold		0.785			V
	PPS input low threshold				0.8	V
	PPS input high threshold		2			V
	PPS output rise time			15		nS
	PPS output fall time			15		nS
	PPS accuracy		1 sigma = 30, 3 sigma = 60			nS
Antenna Ports	DC Output Voltage			2.9		V

1. All voltages referenced to ground.