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AN92239 - Proximity Sensing with CapSense® | Cypress Semiconductor

AN92239 - Proximity Sensing with CapSense®

Last Updated: 
Mar 03, 2021
Version: 
*B

Introduction

A proximity sensor detects the presence of a nearby object without any physical contact. Cypress’s CapSense devices support self-capacitance based proximity sensing and can achieve up to a 30-cm proximity-sensing distance. This application note explains how to:

  • Design a proximity sensor and tune the CSD parameters to achieve large proximity-sensing distances
  • Tune the CSD parameters for a proximity sensor to achieve liquid tolerance
  • Implement proximity-based gesture detection
  • Implement the wake-on-approach feature to reduce the power consumption of the device

 

Capsense sensor distance image

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