Vansco VMM3120, User Manual, Page: 88 / 92

78 VMM3120
Glossary
pull-up resistor
A resistor that connects an input to a voltage reference so that an open circuit can
be recognized by the microprocessor, which is typically used on active-low digital
inputs or analog inputs.
pulse-width modulation (PWM)
A digital logic circuit programmed to produce a pulse having any desired period
or duty cycle. It is a means of controlling variable speed motors. See also duty
cycle.
sensor power
A regulated voltage output that provides a set voltage level for analog sensors
attached to the product.
shielded twisted-pair cable
A type of cable used for CAN communication that consists of two wires (CAN
high and CAN low) twisted together. These wires are covered by a shield material
(CAN shield) that improves the cable's immunity against electrical noise.
short-to-battery
A fault state that occurs when an input or output pin is connected to battery
power, potentially resulting in high current flow.
short-to-ground
A fault state that occurs when an input or output pin is connected to system
ground, potentially resulting in high current flow.
system noise
Electrical interference generated from external devices that affect the behavior of
inputs, outputs, and sensors. System noise can be generated from things like the
vehicle alternator, engine, transmission, etc.
trip time
The amount of time it takes a circuit to protect itself after a fault occurs.
wake on CAN
A method of power control that makes the product turn on when a CAN message
is received from another module in the system, and turn off as determined by the
application software.
wetting current
The minimum current needed to flow through a mechanical switch to break
through any film of oxidation that may be on the switch contacts.