An In-vehicle Hardware System Design For Extended TOF Arrary Sensor

With the development of automotive electronics industry,the in-vehicle entertainment devices become more and more intelligent,and safety is highly demanded when operating these devices.Among all the applications,an interactive system which not requires outdated direct human-machine contact derives from the human-computer interaction system,the system is called non-contact interactive system.When using the non-contact interactive system,the driver or passengers can operate the in-vehicle devices by simply making a gesture.Besides,the devices can also detect dangerous driving behaviors such as drivers hands off the steering steel and give suggestion of how to drive safely.As one of the mainstream detection technologies,TOF detection technology has been widely applied in distance detection and visual depth recognition field.In this paper,for in-vehicle non-contact interactive application,a hardware system which can support TOF array sensor access is designed based on Melexis MLX75023,MLX75123 sensor chip and NXP I.MX6 Q ARM processor.The system can support the in-vehicle electronic device processor,recognizing human gestures and controlling corresponding entertainment devices.The system thus can be widely used in the vehicle electronics industry.Firstly,this paper gives an overview of the TOF technology,introduces the TOF sensor application,the current depth and distance detection technology status and the TOF sensor advantage in these fields.Secondly,this paper introduces the basic design principles of the in-vehicle hardware system for the extended TOF array sensor,and then proposes specific technical parameters in combination with functions which actual system requires.Thirdly,the circuit is designed according to the functions that system needs to implement,including selecting the single board core chips and detailed circuit design process.Fourthly,the paper gives detailed description of the hardware system design,including TOF sensor module interface design,power management design and embedded system hardware design,introduces the important items in single board PCB layout and routing according to single board high-speed signal classification,introduces the unit circuit debugging method,and verifies the hardware system design.lastly,a Summarize is given on the work complete and opinions are proposed on continuous improvement on the hardware circuit problems.