2nd Generation Light to Digital Converter (Envelope and Data)

The TS4231 is Triad’s second generation Light-to-Digital Converter IC. The TS4231 contains all of the features of the TS3633 while adding a DATA output pin that tracks the modulated light carrier input. The TS4231 also includes a two-wire bus that shares the D/E output of the device to provide for configuration of the device and provides the ability to dynamically put the device in a power savings mode. The TS4231 is fully compatible with Valve Corporation’s SteamVR® Tracking System.

The addition of the DATA output pin means that higher bit-rate digital data can be communicated from an optical source such as a SteamVR Tracking base station to the TS4231. This higher speed digital link opens up the capability of using more than two base stations. Multiple base stations installations are useful for digital out of home experiences, arcades, “house-scale” tracking, and non-VR tracking applications such as warehouse-scale or grocery-store-scale tracking.


  • Valve SteamVR® Tracking Compatible Light to Digital Converter Integrated Circuit
  • Convert infrared light pulses to digital pulses used to track position in SteamVR Tracking applications
  • Convert infrared light pulses to digital pulses that follow the optical carrier
  • 1MHz to 10MHz optical carrier frequencies
  • 50Hz/60Hz ambient noise rejection
  • Two-wire control bus shares E/D pins
    • Sleep command
    • Configuration
  • DVDD: 3.3V
  • Small Package Size simplifies industrial design of tracked objects
    • 3×3 Chip Scale Package, 1.61mm x 1.61mm
    • 9-bump WLCSP, 0.5mm pitch package


  • Compatible with SteamVR® Tracking Systems
  • Room-scale Virtual Reality Tracking
  • House-scale Virtual Reality Tracking
  • Warehouse-scale VR and non-VR object Tracking
  • Virtual Reality Controllers with Precision Tracking
  • Tracking of Physical Objects in VR
  • Adding SteamVR® Tracking to
  • VR Head Mounted Displays
  • Robotics Positioning
  • Volumetric Entertainment Systems
  • Optical Ranging
  • Optical Detection
  • Free-Space Optical Communication
  • Low Complexity, Low Computation Requirement Embedded Tracking Systems
  • Indoor and Outdoor Position Systems

Simplified Circuit Diagram

Simplified Circuit Diagram

Related Products

Triad Part NumberDescription
TS4112Complete Light-to-Digital Sensor with Integrated Photodiode