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Digital proximity detector, LED driver and IR LED in an optical module 1.8V I2C interface


  • Integrated proximity detection sensor and IR LED
  • Patented dual-diode architecture
  • Proximity detection calibrated and trimmed to 100mm detection
  • Programmable LED drive current


  • Module reduces board space and design effort
  • Enables operation in IR light environments
  • Pre-calibration eliminates need for customer to calibrate the end product
  • Allows multiple power level selection without external passives

Product parameters

Supply Voltage [V] 2.6 - 3.6
I²C Bus 1.8V
Programmable Interrupt
Integrated Capabilities and Components IR LED
Recommended Operating Distances [cm]
Temperature Range [°C] -40 to 85
Packages Surface mount module, pin count 8

General Description

The TMD2671 family of devices provides a complete proximity detection system and digital interface logic in a single 8-pin package. The proximity detector includes a digital proximity sensor with integrated LED driver, and IR LED. The proximity function is calibrated to 100 mm (without cover glass), thus eliminating the need for end-equipment or sub-assembly factory calibration. The proximity detection feature operates from sunlight to dark rooms. The wide dynamic range also allows for operation in short distance detection behind dark glass such as with a cell phone. An internal state machine provides the ability to put the device into a low power mode providing very low average power consumption. The addition of the micro-optics lenses within the module provide highly efficient transmission and reception of infrared energy, which lowers overall power dissipation for the detection function. Not Recommended for New Designs! ams does not recommend using the FN PACKAGE VARIANTS of this product for new designs. Please contact your local sales representative for further information regarding available or planned replacement options.

This product suits for the following applications:

  • Touchscreen control
  • Printer paper alignment and detection
  • Industrial process control
  • Mechanical switch

Technical Documents

Name Type Description Version Language
ProxDetectMod_AN000526_1-00.pdf Application Note Proximity Detection Layout Recommendations (DN32A) 1-00 English
ProxDetectMod_AN000525_1-00.pdf Application Note Proximity Detection IR LED and Optical Crosstalk (DN 34) 1-00 English
ProxDetectMod_AN000524_1-00.pdf Application Note Proximity Detection and Optical Lenses (DN36) 1-00 English
LightSensors_AN000519_1-00.pdf Application Note Colorimetry Tutorial (DN 20) 1-00 English
TMD2671_BD000197_1-00.png Block Diagram TMD2671 Block Diagram 1-00 English
TMD2671_DS000176_2-00.pdf Datasheet Document version 1-00 2-00 English
TMD2671_TMD2771_EN000100_1-00.pdf EoL Notification TMD2671, TMD2771 (issued 2018-Sep) 1-00 English
TMD2671_FS000110_1-00.pdf Factsheet Proximity Detection Sensors 1-00 English

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