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1、Freescale MMA845xQ系列三轴加速度计开发方案关键字：工业控制,传感器,电子罗盘Freescale公司的MMA845xQ系列是智能低功耗三轴容性微机械加速度计,具有12位分辨率,电源电压1.95V-3.6V,接口电压1.6V-3.6V,动态可选择满刻度+/-2g/+/-4g/+/-8g,输出数据速率(ODR)为1.56 Hz 到800 Hz,12位和8位数字输出,I2C数字输出接口,电流消耗6uA-160uA,主要用于电子罗盘,静态方向检测,笔记本,电子书等跌落检测,实时方向检测和工作分析,手持设备运动检测,震动和振动监视和用户接口.本文介绍了MMA845xQ系列主要特性和方框图
2、,应用框图以及MMA845xQ加速计开发套件LFSTBEB845x电路图与MMA8451/2/3Q应用电路图.The MMA8452Q is a smart low-power, three-axis, capacitive micromachined accelerometer with 12 bits of resolution. This accelerometer is packed with embedded functions with flexible user programmable options, configurable to two interrupt pins. E
3、mbedded interrupt functions allow for overall power savings relieving the host processor from continuously polling data.The MMA8452Q has user selectable full scales of +/-2g/+/-4g/+/-8g with high-pass filter filtered data as well as non-filtered data available real-time. The device can be configured
4、 to generate inertial wakeup interrupt signals from any combination of the configurable embedded functions allowing the MMA8452Q to monitor events and remain in a low power mode during periods of inactivity. The MMA8452Q is available in a 3 mm by 3 mm by 1 mm QFN package.MMA845xQ系列主要特性:. 1.95V to 3.
5、6V supply voltage. 1.6V to 3.6V interface voltage. +/-2g/+/-4g/+/-8g dynamically selectable full-scale. Output Data Rates (ODR) from 1.56 Hz to 800 Hz. 99 ug/Hz noise. 12-bit and 8-bit digital output. I2C digital output interface. Two programmable interrupt pins for six interrupt sources. Three embe
6、dded channels of motion detection. Freefall or Motion Detection: 1 channel. Pulse Detection: 1 channel. Transient Detection: 1 channel. Orientation (Portrait/Landscape) detection with set hysteresis. Automatic ODR change for Auto-WAKE and return to SLEEP. High-Pass Filter Data available real-time. S
7、elf-Test. RoHS compliant. Current Consumption: 6uA-165 uAMMA845xQ系列典型应用:. eCompass applications. Static orientation detection (Portrait/Landscape, Up/Down, Left/Right, Back/Front position identification). Notebook, eReader and Laptop Tumble and Freefall Detection. Real-time orientation detection (vi
8、rtual reality and gaming 3D user position feedback). Real-time activity analysis (pedometer step counting, freefall drop detection for HDD, dead-reckoning GPS backup). Motion detection for portable product power saving (Auto-SLEEP and Auto-WAKE for cell phone, PDA, GPS, gaming). Shock and vibration
9、monitoring (mechatronic compensation, shipping and warranty usage logging). User interface (menu scrolling by orientation change, pulse detection for button replacement)图1.MMA845xQ系列框图图2.MMA845xQ系列应用框图MMA845xQ加速计开发套件The Freescale MMA845xQ sensor toolbox accelerometer kit provides hardware and softwa
10、re for development and demonstration of the MMA845xQ family of accelerometers.MMA845xQ加速计开发套件包括:The kit includes the following: MMA845xQ evaluation board MMA8451Q accelerometer daughter board MMA8452Q accelerometer daughter board MMA8453Q accelerometer daughter boardThe kit requires the LFSTBUSB USB
11、-interface board to attach the kit to a personal computer. If you already have the RD3924MM450Q Sensor Toolbox, for the MMA8450Q accelerometer, the USB board is in that kit.The MMA845xQ kits part number is LFSTBEB845x and the USB-interface boards part number is LFSTBUSB.图3.MMA845xQ加速计开发套件外形图图4.LFSTBEB845x电路图(1)图5.LFSTBEB845x电路图(2)图6.LFSTBEB845x开发板布局图图7.MMA8451Q电路图AO-Electronics 傲壹电子 官网： 中文网：图8.MMA8452Q电路图图9.MMA8453Q电路图
