TS4231 SteamVR® Tracking Light to Digital Converter with DATA Output
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TS4231 Description
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.
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TS4231 Simplified Circuit Diagram
Device Overview
The TS4231 is a mixed-signal integrated circuit for use in optical position tracking applications. Utilizing Wafer Level Chip Scale Packaging (WLCSP), it achieves a minimal footprint size for use in space-constrained assemblies. The TS4231 provides pulse detection circuitry for use in room scale tracking/positioning for virtual reality gaming and other applications which require millimeter position accuracy. The signal path is driven from an external photodiode which is connected directly to the IIN+ and IIN- package inputs, then AC coupled to the inputs of a differential TIA. Internal bias blocks provide the necessary biasing for the photodiode. The output of the differential TIA is followed by filtering and gain blocks to limit noise before the signal drives an envelope detector and data slicer to generate the output signals. Figure 2 shows the block diagram of the TS4231. The TS4231 is available in a 9-bump WLCSP package.