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TMD2635 IR Proximity Detection Module

2-in-1 ultra small proximity detection module 1.8V I²C


  • Ultra-Small (1.0mm3) 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 and low profile 2.0mm x 1.0mm x 0.5 mm package


  • Ideal for the smallest size applications
  • Enables accurate and stable measurements behind highly diffusive and spectrally distorting materials in low light level environments
  • Compensates for unwanted ambient light photodiode current
  • Enables an additional device to reside on I²C bus with 0x38
  • Enhances industrial design flexibility of sensor apertures sizes and shapes (1.5mm circular or 1x2mm oval)
  • Reduces overall system power consumption
  • Reduce board space requirements and enable low-profile system design

Product parameters

Supply Voltage [V] 1.7 - 2.0
I²C Bus 1.8V
Programmable Gain, Integration Time, Interrupt
Integrated Capabilities and Components IR VCSEL
Recommended Operating Distances [cm] <5
Temperature Range [°C] -30 to 85
Package OLGA, Pin Count 6

General description

The TMD2635 is an advanced IR proximity sensor module suited for short range proximity measurement detection and offered in the industry's smallest size (1.0mm x 2.0mm) and thin (0.5mm) optical land grid array module that incorporates a 940nm IR VCSEL and is factory calibrated for IR proximity response. The proximity detection feature provides nearby object detection by photodiode detection of reflected IR energy sourced by the integrated VCSEL emitter. Sensitivity, power consumption, and noise can be optimized with adjustable timing and power. Detect/release events can be interrupt driven, and occur when proximity result crosses upper and/or lower threshold settings. The proximity engine features advanced crosstalk noise cancellation through a wide range offset adjustments to compensate for unwanted IR energy reflection at the sensor. Proximity results are further improved by automatic ambient light subtraction.

This product suits for the following applications:

  • True-Wireless Stereo Ear Buds
  • Display Backlight Control
  • Optical Switch


Title Category Headline Buy
TMD2635 Evaluation Kit Application Board Evaluation Kit for TMD2635

Technical documents

Type Description Language
Datasheet TMD2635 Datasheet English
Application Note Low power proximity detection English
Application Note Using Interrupts and the Persistence Filter (DN 41) English
Application Note TSL2771 I2C Communications & Proximity Algorithm (DN30A) English
Application Note Proximity Detection and Link Budget (DN38) English
Application Note Proximity Detection and IR Ink (DN 35) English
Application Note Proximity Calibration and Test (DN 37) English
Application Note Proximity Detection Layout Recommendations (DN32A) English
Application Note Proximity Detection IR LED and Optical Crosstalk (DN 34) English
Application Note Signal, Noise, Offset and Proximity Sensors (DN33) English
Application Note Signal, Noise, Offset - TSL2771 (DN33.1 Appendix) English
Application Note Signal, Noise, Crosstalk - TCS3771 (DN33.2 Appendix) English
Application Note Optimizing Proximity Parameters English
Application Note Proximity Calibration Using POFFSET English
Application Note Proximity Factory Calibration English
Application Note Basic Pre-Production Light & Color Sensor Solution Validation Process English
Quick Start Guide TMD2635 EVM English
User Guide TMD2635 EVM User Guide English

Environmental documents

Type Description Language
RoHS Certificate RoHS Certificate_TMD2635 English


Type Description Language
Product Change Notification CN16-2020 (VCSEL supplier change) English

Other information

Type Description Language
Block Diagram TMD2635 Block Diagram English
Factsheet IR Proximity Detection (Factsheet for TMD2635) English
Image TMD2635 Bottom view
Image TMD2635 size Comparison
Image TMD2635 perspective view
Image TMD2635 Top view
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