Triad Semiconductor’s TS4112 enables cost effective deployment of Valve Corporation’s SteamVR™ Tracking System. With an integrated photodiode and no external components required, the TS4112 provides a low-cost, area-efficient solution for a complete IR to digital converter solution. The TS4112 converts infrared light pulses into position-indicating digital envelope signals and includes a digital output data pin that is a representation of the optical carrier waveform applied to the photodiode. The TS4112 includes circuits for photodiode biasing and provides high gain, noise filtering and envelope detection of a pulsed IR light sources. The Envelope output of the TS4112 is a digital signal that tracks the envelope of the amplitude modulated (OOK or ASK) infrared light that is incident on the photodiode. The data output is a digital signal that tracks the modulated light input. The TS4112 is configured by a two-wire bus that shares the E/D pins of the device.
Valve Software Corporation worked with Triad to make SteamVR Tracking for Virtual Reality.
SteamVR Tracking can locate a tracked object to within less than 1mm in a 10-meter x 10-meter x 10-meter tracked space with 6-degree-of-freedom updates provided hundreds of times a second. Triad makes the laser light sensors that make SteamVR Tracking a reality for VR head-mounted displays (HMDs), hand-held controllers, and a growing number of useful tracked objects for gaming, construction and medical apps.
Triad’s Light-to-Digital Converters are ideal opto-electronic sensors for detecting swept and modulated laser light. The TS4112 is a complete swept-laser-light sensor including an on-board photodiode and low-power and high-gain analog-front-end for detecting weak optical signals in noisy ambient lighting conditions. The TS4112’s small size and lack of external components makes it an ideal solution for VR, AR, IoT and wearable tracking applications.
3.3V Digital Voltage Input
Operating: 2.5mA (typ)
|Input Pulse Frequency|
1.5Mhz to 10MHz
|Triad Part Number||Description|
|TS3633||1st Generation Light to Digital Converter (Envelope Only)|
|TS4231||2nd Generation Light to Digital Converter (Envelope and Data)|
The ‘Shoto’ SteamVR Tracking HDK is a complete system for developing a SteamVR Tracked Object. the HDK comes with the main Shoto rigid board and two 13-sensor flexes. The 13-sensor flexes contain 13 TS4112 Light-to-Digital Converter ICs to receive swept laser tracking information from ‘Lighthouse’ base stations. Adding the HDK electronics to a hardware device such as an HMD, hand-held controller, stylus, sword, etc. adds precision, real-time, 6-degree-of-freedom (6DOF) tracking to the object so that it can be tracked in a SteamVR environment. Note the Shoto HDK contains both the rigid board and two 13-sensor flex assemblies.
The 13-sensor flex contains 13 TS4112 Light-to-Digital Converter ICs. The flex is made to connect to the Shoto HDK SteamVR Tracking rigid board.
Note: the 13-sensor flex does not come with the Shoto rigid board (see the Shoto SteamVR Tracking HDK for the complete tracking kit).
You can purchase the 13-sensor flex assembly individually to make multiple tracked object prototypes. The rigid Shoto board can then be shared between tracked objects as needed.
The TS4112 is mounted on a 4-inch “pigtail” flexible printed circuit (FPC). The flex connector end of the pigtail is a 4 signal edge connector compatible with the original Watchman SteamVR Tracking HDK. The pigtail is also useful for prototyping custom tracking hardware that uses a 4-pin FPC connector.
Rigid pcb for wireless breadboarding and custom prototyping. The TS4112 is mounted on a PCB with two 2-pin 100-mil-center headers. The top 2-pin header connects power and ground. The bottom 2-pin header connects the Data and Envelope signals.