Electrical

Pin Definitions

Pin number MAIN Function 1 USB D- USB Data- 2 USB D+ USB Data+ 3 V primary (4.7-36V DC) Power Supply (connected internally with pin 6) 4 RS-232 Rx RS-232 Rx 5 RS-232 Tx RS-232 Tx 6 V auxiliary (4.7-36V DC) Power supply (connected internally with pin 3) 7 GPIO 1 Logic level GPIO 8 Ground Signal & Power Ground 9 GPIO 2 Logic level GPIO

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
V primary & auxiliary(2)	Input Voltage	Protected against ESD and other high-voltage / low-energy transients. (4)	-36	40	V
RS-232 Tx	Input Voltage		-15	15	V
RS-232 Rx			-25	25	V
USB D-	Input Voltage		0	+5.5	V
USB D+			0	+5.5	V
GPIO(3)	Input Voltage		-0.7	+7	V
Chassis	Applied Voltage		-12	12	V

Notes:

1. All voltages referenced to ground.
2. Reverse polarity and overvoltage protected.
3. Input voltage in this range may be applied even when the device is powered off.
4. Tested per IEC 61000-4-2 Electrostatic Discharge with air discharge levels of ±2 kV, ±4 kV, and ±8kV, and contact of ±2 kV and ±4 kV.

 

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
V primary & auxiliary	Power Supply Voltage		4.7		36	V
RS-232 Tx	Input Voltage		-15		15	V
RS-232 Rx			-15		15	V
USB D-	Input Voltage	Connect to USB host only, or leave disconnected	0		5	V
USB D+			0		5	V
GPIO	Input Voltage		0		5	V

1. All voltages referenced to ground.

 

Electrical Characteristics

Pin	Specification(1)	Notes	Min	Typ	Max	Units
V primary & auxiliary	Power Consumption	-40°C		310		mW
		25°C		320
		85°C		385
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
GPIO	Output Low	No Load		0.01	0.4	V
	Output High		2.6	2.99		V
	Output Low	300uA load		0.3	0.7	V
	Output High		2.3	2.7		V
	Input Low Threshold		1.1			V
	Input High Threshold				2.1	V
	GPIO Output Impedance			1k		Ω
	GPIO Input Pullup/Pulldown Resistance		30	40	50	kΩ

1. All voltages referenced to ground.