To reduce ground level shift:
If there are more than 1 GND pins in the system, dedicate one of them to
sensors that have ground wires, and connect all sensor grounds to that system
ground pin.
Splice the other system ground inputs together in the vehicle harness (close to
the connector), to provide a better ground for the noisier low-side outputs and
digital circuits.
Ensure the sensor’s ground connection is close to the system ground
connections. This will help ensure the signal remains within the digital
activation range of the input.
Note 1: The VMM1210 system ground inputs are rated for low-current
signals, which ensures the sensor’s ground is very close in voltage potential to
the system ground.
Note 2: Sensors that don’t have a dedicated ground wire are typically
grounded to the vehicle chassis through the sensor’s body.
The following shows a typical DC-coupled frequency input connection:
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