TS4231

Sensor And Detector Interfaces Overview

The TS4231 is a light-to-digital converter IC designed for SteamVR tracking systems. It converts infrared light pulses into digital envelope and data signals using a 9-bump WLCSP package measuring 1.66mm x 1.66mm. The device operates on a 3.3V digital supply (DVDD) with an internal LDO providing AVDD. Electrical characteristics include an operating current of 5.0mA to 7mA at 3.3V, sleep mode current of 0.75mA to 1.0mA, and input pulse frequency detection from 1MHz to 10MHz. Absolute maximum ratings specify a DVDD limit of 3.6V and a junction temperature of 150°C.

Sensor And Detector Interfaces Feature Summary

• Integrated photodiode biasing and high-gain noise filtering circuitry
• Dual output capability for position-indicating envelope and optical carrier data
• Two-wire control bus sharing E/D pins for configuration and sleep commands
• Ambient noise rejection for 50Hz/60Hz interference

Sensor And Detector Interfaces Applications

• SteamVR Tracking Applications
• Room-scale Virtual Reality Tracking
• Virtual Reality Controllers
• Tracking of Physical Objects in VR
• Robotics Positioning

Sensor And Detector Interfaces Procurement Notes

Verify the component marking 'TS4231' and date code format YYWW against the datasheet branding diagram. Confirm RoHS compliance and absence of antimony/bromine as specified. Ensure handling procedures account for the Class 1C HBM ESD rating and MSL Level-1 status during storage and assembly.

Sensor And Detector Interfaces Selection Notes

Select this component for space-constrained assemblies requiring millimeter-level accuracy in virtual reality positioning. The 9-bump WLCSP package minimizes footprint. Designers must ensure the external photodiode load does not exceed 30pF and that layout guidelines minimize stray capacitance at IIN+, IIN-, and RBIAS inputs to maintain optimal performance.

Sensor And Detector Interfaces Part Context

Triad Semiconductor developed the TS4231 specifically to enable cost-effective deployment of Valve Corporation’s SteamVR Tracking System. It functions as a mixed-signal integrated circuit utilizing Wafer Level Chip Scale Packaging to achieve minimal size for tracked objects in VR gaming and other optical positioning applications.

Sensor And Detector Interfaces Replacement Considerations

No officially documented substitute part numbers are available in the public datasheet. The device utilizes proprietary integration for SteamVR tracking; alternative components may require significant redesign of the signal path and control interface.

Sensor And Detector Interfaces FAQ

How is the TS4231 configured after power-on?

After power-on, the device must detect modulated infrared light before the SteamVR Tracking HDK communicates over the E and D pins to configure the device via the two-wire bus.

What is the function of the RBIAS pin?

An external 1% tolerance 15kΩ resistor connected to the RBIAS input sets the internal reference for the device's internal detection levels.

How does the Data detector handle long low durations?

The Data pin low time is qualified with an internal one-shot and is forced to return low if the low duration exceeds a 600ns to 900ns timeout.