TIDA-00506 reference design from Texas Instruments

Automotive Capacitive Proximity Kick to Open Detection Reference Design

Description

This reference design showcases proximity sensitivity using our FDC1004 evaluation module (EVM) for an automotive kick-to-open application within a plastic bumper. This design also showcases test results that include exposure to mud and water on the bumper to determine the impact of common environmental factors.

Features

Input offset capacitance up to 100 pF. The large offset-capacitance capability allows for the use of remote sensors and long cables. It also allows tracking and compensating for environmental changes over time (temperature and humidity).A two-channel shield drives up to 400 pF. The large shield drive can reduce environmental interferences such as EMI: noise and proximity from undesired targets and help focus the sensing direction of a capacitive sensor: thus enhancing its resolution.Effective resolution (noise floor) of 16 bits allows far object sensing with a small: inexpensive conductive sensor.Four measurement channels allow multiple applications where one channel can be used as an environmental sensor to track and compensate for environmental (temperature and humidity) changes.Small 3-mm x 3-mm footprint enables using the device in space-constrained applications