Lattice Semiconductor Corporation revealed that Valve chose Lattice’s iCE40 FPGA to improve the SteamVR Tracking platform. Lattice’s iCE40 FPGA reduces position tracking overhead by combining the tracking data from multiple sensors before sending the signal to the host processor.
The first generation of Valve’s SteamVR Tracking system (formerly known as Lighthouse tracking) offers sub-millimeter tracking accuracy and industry-leading tracking volume, but Valve isn’t satisfied with its solution. The company is hard at work developing the second generation of the SteamVR Tracking system, which increases tracking volumes, reduces power consumption, and lowers manufacturing costs.
However, Valve is slowly trickling out information about this second-gen SteamVR Tracking system. Early this year, Valve confirmed that it's developing new SteamVR Base Stations that offer reduced internal complexity. They won't include moving parts like the current Base Stations do, which should improve reliability and reduce manufacturing defects. The new Base Stations also feature a wider field of view and the ability to pair the headset with more than two units.
In early June, Valve revealed that it partnered with Triad Semiconductors to develop sensor ASICs for the next generation SteamVR tracking system, and it implored hardware developers to adopt the new sensors immediately because of compatibility concerns. The new sensors would support the current Base Stations and the upcoming second generation Base Station design, whereas the old sensor design would not support the new Base Stations.
Valve is also working with Lattice, though, and adopted its iCE40 FPGA to help improve the efficiency of the SteamVR tracking system. The iCE40 FPGA pulls in tracking data from the Triad TS4231 sensors that are embedded in the trackable device and feeds the pre-processed data to the host computer. Lattice Semiconductors said that processing the data on the device before sending it to the host PC “reduces EMI emission, PCB congestion and improves signal integrity.”
“Our low power, low cost, and small form factor iCE40 FPGA allows each sensor to have an independent interface for low latency data capture and parallel processing,” said Ying Chen, senior business development manager at Lattice Semiconductor. “Our FPGA enables the host to accurately process simultaneous sensor events by providing the MCU with metadata such as time stamping. This capability can also be useful in other movement or flow related analysis where low latency and concurrency are required.”
Lattice Semiconductors said the iCE40 FPGAs could benefit other VR- and AR-related devices, including wireless HMD upgrade kits, multi-camera 360-degree rigs, and MIPI bridging for micro displays (such as the ones that Kopin is developing for mobile VR HMDs).
Valve hasn’t yet announced any products that are being built for SteamVR Tracking 2.0, but the company has more than 500 SteamVR Tracking licensees developing technology and hardware for Valve’s tracking system, so you can expect product announcements in the future.