Data Sheet

QPRO Technical Data Sheet
Document 1137-0901, REV K 24
Figure 4-7, Switched Relay Characteristics
Warning: Connecting SW_UBATT1 or SW_UBATT2 (pin 27 and 25) directly to ground while the switch
is turned “ON” will damage the unit. If SW_GND1 or SW_GND2 (pin 26 and 28) is tied directly to VBATT (Pin
1 and 2) while the switches are turned “ON,” the unit will be damaged .
Inductive Load Use Warning: If an inductive load such as a relay is used, it can generate a spike
voltage across it. If that exceeds 60 volts peak the spike must be limited. Check if the external inductive load
is internally limited. If not, a clamp diode across the inductive load, with the cathode towards the positive
input lead must be used.
4.1.3 J1939
The J1939 bus connection is used on Heavy Truck Engine Computers to obtain engine and other subsystem
parameters such as Oil Pressure and Fuel Level. See the SAE J1850/1939 specification for additional
information on this engine bus.
• CAN Bus with J1939 stack interface
• This bus is connected on pins 10 (CAN_H) and 11 (CAN_L)
4.1.4 3.5V Power
There are two pins that provide 3.5 VDC continuous power: Pin 3 and Pin 4. The total current added up
between these two pins cannot exceed 650 mA. Don’t include these pins on the connector if they are not
being used.
Warning: Connecting these pins incorrectly could damage the unit and void the warranty.
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