Passenger Safety Sensors
Automotive Sensor Products
Dual Seat Belt Buckle and Tension Sensor
Features
Magnetically operated position sensor
Integrated in spring loaded seat belt buckle
Dual output for 1) presence and 2) tension
•
•
1) Two logic output states (100 & 400 Ohm)
2) Ratiometric voltage output (belt tension)
Operates when the thorn in the seat belt buckle
moves from an unlatched to a latched position
Choice of cable length and clips
Choice of connector and terminals
Ability to customize sensor output to customer needs
Benefits
Robust construction makes this sensor well suited to
harsh environments
Non-contact, Reed and Hall Effect technology
General Description
The seat belt presence sensor detects whether the seat
belt buckle is latched or unlatched. The tension sensor
detects the tension of the seatbelt. This sensing system
helps determine the optimum airbag deployment. It is also
used as an input to the electronic park brake and the
unbuckled warning system.
Applications
Vehicle Occupant Safety Systems
Operation
Basic Principle
The sensor is in a pre-defined single logic output state. When the seat belt buckle thorn moves from an unlatched to
a latched position the magnetic circuit will be complete, activating the Reed Switch, which will switch the logic (voltage)
output levels to the customer's electrical interface. Concurrently, a Hall Effect sensor would detect the actual position of the
spring loaded buckle and output a voltage that is proportional to that position to the customer's electrical interface.
Packaging Options
Custom packaging can be provided to meet any need, please contact Littelfuse Engineering for details.
© 2018 Littelfuse, Inc.
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