原标题：Rohm KX134－1211高频高温三轴加速度计解决方案

　　Rohm公司的KX134-1211是高频三轴硅微机械加速度计,检测的频段高达8,500Hz,可检测加速度为±8g, ±16g, ±32g或±64g,具有用户可配置的三级先进数据通路(ADP),包括低通滤波器,低通/高通滤波器和RMS计算引擎.此外,KX134-1211还具有先进的叫醒和睡眠检测,其高分辨率阈值可配置到低于15.6mg,而512B缓冲器能连续记录在读的数据,以及用于取向,取向节点/双节点和自由下落检测的嵌入引擎.检测元件采用Kionix公司的专利等离子微加工工艺技术制造.加速度检测是基于检测元件的加速度感应运动所引起差分电容原理,所采用的共模式抵消能降低工艺制造,温度和环境应力所引起的误差.检测元件和单独的ASIC器件封装在同一个封装,提供了信号调理和智能用户可编程的应用算法.与传统产品最高只有摄氏85度的工作温度相比,KX134-1211工作温度可高达摄氏105度,主要用在工控装置的马达振动分析等机器健康监测运用以及物流跟踪,可穿戴式设备和汽车智能钥匙等.本文介绍了KX134-1211主要特性,机械指标和电性能指标,功能框图,应用电路图,以及数字评估板RoKiX主要特性,电路图和PCB设计图.

　　The KX134-1211 is a tri-axis ±8g, ±16g, ±32g, or ±64g silicon micromachined accelerometer featuring a user-configurable 3-stage Advanced Data Path (ADP) consisting of a low-pass filter, low-pass/high-pass filter, and RMS calculation engine. The KX134-1211 accelerometer also features an advanced Wake-Up and Back-to-Sleep detection with a high-resolution threshold capability configurable down to 15.6 mg, 512-byte buffer that continues to record data even when being read, as well as embedded engines for orientation, Directional-TapTM/Double-TapTM, and Free fall detection. The sense element is fabricated using Kionix’s proprietary plasma micromachining process technology. Acceleration sensing is based on the principle of a differential capacitance arising from acceleration-induced motion of the sense element, which further utilizes common mode cancellation to decrease errors from process variation, temperature, and environmental stress. The sense element is hermetically sealed at the wafer level by bonding a second silicon lid wafer to the device wafer. A separate ASIC device packaged with the sense element provides signal conditioning and intelligent user-programmable application algorithms. The KX134-1211 accelerometers offer lower noise and improved linearity over of the entire temperature range. The accelerometer is delivered in a 2 x 2 x 0.9 mm LGA 12-pin plastic package operating from a 1.7V – 3.6V (VDD) / 1.2V – 3.6V (IO_VDD) DC supplies. Internal voltage regulators are used to maintain constant internal operating voltages over the range of input supply voltages. This results in stable operating characteristics even if the supply voltage changes. I²C or SPI digital protocol is supported to configure the chip, read acceleration outputs, and check for updates to the orientation, Directional-TapTM/Double-TapTM detection, Free fall detection, and activity monitoring algorithms. Two configurable interrupt pins are also available to show the output of the embedded detection algorithms.

　　KX134-1211主要特性:

　　• Operating temperature range from -40ºC to+105ºC

　　• Small footprint: 2 x 2 x 0.9 mm LGA 12-pin package

　　• User-configurable g-range up to ±64g and Output Data Rate up to 25600Hz

　　• A user-configurable 3-stage Advanced Data Path (ADP) consisting of a low-pass filter, low-pass/high-pass filter, and RMS calculation engine.

　　• High resolution Wake-Up / Back-to-Sleep functions with threshold configurable down to 15.6 mg

　　• User accessible manufacturer and part ID registers

　　• Self-test Function

　　• Integrated Free fall, Directional-TapTM / Double-TapTM,and

　　Device-orientation algorithms

　　• Improved ODR accuracy in Low Power mode over temperature

　　• Embedded 512-byte FIFO buffer continues to record data even when being read

　　• User-selectable Low Power or High-Performance modes

　　• Internal voltage regulator

　　• Digital I2C up to 3.4MHz and Digital SPI up to 10MHz

　　• Excellent temperature performance with high shock survivability

　　• RoHS / REACH compliant

　　图1.KX134-1211功能框图

　　KX134-1211机械指标:

　　KX134-1211电器指标:

　　图2.KX134-1211应用电路图

　　The RoKiXIoT Platform provides a powerful and easy to use environment to begin the evaluation of ROHM and Kionix products. Multiple hardware options are supported (RoKiXIoT Platform HW), as well as common, hardware independent SW tools (RoKiXIoT Platform SW). RoKiX Windows GUI consists of an easy to use graphical user interface for displaying and recording sensor data, and a register map editor which allows the user to see and change the content of control registers. RoKiX Python CLI, in turn, provides reference implementation for driver SW and also a convenient way to access sensor low level features and versatile data logging functionality. Finally, RoKiX Android App provides an easy way to display and log the sensor data from a RoKiX Sensor Node over Bluetooth.

　　KX134-1211数字评估板RoKiX

　　KX134-1211 evaluation board is used to evaluate KX134-1211 tri-axis 16bit ± 8g/16g /32g /64g accelerometer. The accelerometer features a user-configurable 3-stage Advanced Data Path (ADP) consisting of a low-pass filter, low-pass/high-pass filter and RMS calculation engine.

　　High resolution wake-up/back-to-sleep functions with threshold configurable down to 15.6mgUser accessible manufacturer and part ID registersSelf-test functionIntegrated free fall, directional-tap/double-tap and device-orientation algorithmsImproved ODR accuracy in low power mode overtemperatureEmbedded 512byte FIFO buffer continues to record data even when being readUser-selectable low power or high-performance modesInternal voltage regulatorDigital I2C up to 3.4MHz and digital SPI up to 10MHz

　　Excellent temperature performance with high shock survivability.

　　图3.数字评估板RoKiX外形图

　　图4.数字评估板RoKiX电路图(1)

　　图5.数字评估板RoKiX电路图(2)

　　图6.数字评估板RoKiX电路图(3)

　　图7.数字评估板RoKiX电路图(4)

　　图8.数字评估板RoKiX电路图(5)

　　图9.数字评估板RoKiX电路图(6)

　　图10.数字评估板RoKiX电路图(7)