Maxim MAX25205汽车应用手势传感器解决方案

Maxim公司的MAX25205是用于手势和接近传感的低成本数据采集系统. MAX25205识别手势(向坐,向右,向上滑动,向下滑动),手指和手旋转(CW和CCW),以及接近检测.这种接近,手检测和手势识别功能是采用集成的6x10元件光传感器阵列通过受控制的IR-LED光源的反射光检测来实现的.当暴露在明亮的环境光下,这些手势就能被MAX25205检测到.低功耗低成本CPU如MAX32630需要处理来自传感器的数据.器件集成了60象素的IR光二极管阵列和LED驱动器, 400kHz I2C和6MHz SPI串行接口,工作在120k勒克斯环境光,满足AEC-Q100资证,工作温度-40C到 +85C.超低功耗工作,3.3V时1mA,紧凑4mm x 4mm x 1.35mm 20引脚QFN封装.主要用在中央信息显示屏控制,后座娱乐系统,门与月亮屋顶和行李箱控制,替代机械开关和占用检测.本文介绍了MAX25205主要优势和特性,框图和简化系统框图,应用电路以及评估板MAX25205 EVK主要特性和优势,系统框图,电路图,材料清单和PCB设计图.

The MAX25205 is a low-cost data-acquisition system for gesture and proximity sensing. The MAX25205 recog­nizes the following independent gestures:

●Hand swipe gestures (left, right, up, and down)

●Finger and hand rotation (CW and CCW)

●Proximity detection

The proximity, hand detection, and gesture recognition functions of the MAX25205 operate by detecting the light reflected from the controlled IR-LED light source with an integrated 6x10-element optical sensor array. The MAX25205 can detect these gestures even when exposed to bright ambient light. A low-power, low-cost CPU, such as the MAX32630, is required to process the data from the sensor.

This discrete light source is created externally with one or more FETs driven directly from the MA25205. The light sources PWM duty cycle is programmable from 1/16 to 16/16. The LEDs are pulsed on one or more times in a pro­grammable sequence that is repeated for every sample.

For flexibility, the MAX25205 supports two different serial communication protocols: I2C (400kHz) and SPI (6MHz).

The proximity, hand-detection, and gesture-recognition functions are achieved by detecting the ...