Keyless Entry Keypad Switch

Stoneridge capacitive switch solutions use a change in capacitance from human touch to activate switch functions in all manner of keypad or push-button applications. Tru-Sense™ uses a dual electrode design and patented software algorithms coupled with single chip control ensure design flexibility and economies of scale for multi-switch applications. Stoneridge technology enables the switch to function reliably under adverse environmental conditions such as rain, ice, dirt, dust, chemicals and mechanical shock.

Features and benefits
  • Self-calibrating algorithm – Allows switch activation from human touch in presence of changing dielectric environment (e.g. temperature/humidity/moisture)
  • Adjacent key suppression
  • Anti-Swipe Technology
  • Temperature range: -40 to 85° C
  • Non-contact – Requires no moving parts
  • PCB based technology – depth of switch dependent on component height, surface geometry, connector location; PCB could be placed adjacent or remotely to capacitive traces
  • Low current draw: ex. Quiescent 250uA / 4mA active
  • Switch points are electrode/trace based versus multiple individual switches or capacitive chips
  • Flexible substrate
  • Environmental sealing – can be fully encapsulated or sandwiched between layers
  • Allows use of multiple conductive materials for traces, e.g. clear conductive ink

Typical applications

Exterior

  • Replace less durable mechanical and membrane switches for trunk release and passive entry door handles
  • PIN Pad keyless entry pads
  • Active badge/emblem switches

Interior

  • Ignition switch (PIN Pad)
  • Headlight switches
  • Door panel mounted controls
  • Overhead console
  • Glove box button