Fully Integrated Proximity Sensor for Reliable In-Ear Proximity Detection and Minimal Power Consumption in Space-Constrained Wireless Earbuds

TMD2636 Fully Integrated Proximity Sensor Module

AMS has come up with a fully integrated proximity sensor module, TMD2636 that enables the integration of new functionality in space-constrained wireless True Wireless Stereo (TWS) earbuds occupying just 30% less space than the current solutions. Encompassed in an ultra-low-profile 0.35mm package, the device occupies a volume of just 0.7mm3, thereby enabling the accommodation of multiple proximity sensors, increasing reliability and addition of new functionality resulting in an enhanced user experience.


This new sensor provides reliable in-ear proximity detection and saves power when the earbud is not in use. The TMD2636 sensor module integrates a 940nm infrared (IR) Vertical-Cavity Surface-Emitting Laser (VCSEL) emitter, IR-sensing photodiodes, sophisticated control circuitry, and a clear-mold overlay in a 2.0mm x 1.0mm x 0.35mm package.


The TMD2636 sensor has an average active-mode current consumption of 70µA and 0.7µA in sleep mode. Its design provides outstanding crosstalk rejection, high immunity to interference from ambient light, and highly effective algorithms that produce accurate proximity detection results. Additionally, the TMD2636 digital I2C interface provides a patented solution for two devices to reside on the same bus hence simplifying the system design for dual devices.


Key Features of TMD2636 Proximity Sensor

  • Low-profile (0.35mm) and ultra-small (0.7mm³) volumetric size
  • Proximity crosstalk compensation
  • 940nm IR proximity with automatic ambient light subtraction
  • Automatic single alternative I²C address option
  • Split near/far photodiodes and offset emitter/detector placement
  • 0.18µm process technology with 1.8V I²C
  • Small footprint 2.0 mm x 1.0 mm x 0.35 mm package


The TMD2636 proximity sensor is available for sampling and you can get more technical information from the company website.

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