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 　飛思卡爾(Freescale)公司的MMA7455L是小型低功耗±2g/±4g/±8g三軸數字輸出加速度計,具有信號調理,低通濾波器,溫度補償,自測,以及可配置到檢測0g或脈沖檢測快速運動等功能,工作電壓2.4V到3.6V,典型應用在手機,PMP,PDA,硬盤驅動(HDD),筆記本電腦,步程計和運動檢測等.本文介紹了MMA7455L主要特性, 簡化功能方框圖, I2C接口到MCU的連接圖與電路圖以及SPI接口到MCU的連接圖與電路圖。

　　MMA745xL:±2g/±4g/±8g Three Axis Low-g Digital Output Accelerometer

　　The MMA7455L is a Digital Output (I2C/SPI), low power, low profile capacitive micromachined accelerometer featuring signal conditioning, a low pass filter, temperature compensation, self-test, configurable to detect 0g through interrupt pins (INT1 or INT2), and pulse detect for quick motion detection. 0g offset and sensitivity are factory set and require no external devices. The 0g offset can be customer calibrated using assigned 0g registers and g-Select which allows for command selection for 3 acceleration ranges

　　(2g/4g/8g). The MMA7455L includes a Standby Mode that makes it ideal for handheld battery powered electronics.

　　MMA7455L主要特性：

　　Digital Output (I2C/SPI)

　　3mm x 5mm x 1mm LGA-14 Package

　　Low Current Consumption

　　Self-Test for Z-Axis

　　Low Voltage Operation: 2.4 V – 3.6 V

　　User Assigned Registers for Offset Calibration

　　Programmable Threshold Interrupt Output

　　Level Detection for Motion Recognition (Shock, Vibration, Freefall)

　　Pulse Detection for Single or Double Pulse Recognition

　　Sensitivity (64 LSB/g @ 2g and @ 8g in 10-Bit Mode)

　　Selectable Sensitivity (±2g, ±4g, ±8g) for 8-bit Mode

　　Robust Design, High Shocks Survivability (5,000g)

　　RoHS Compliant

　　Environmentally Preferred Product

　　Low Cost

　　MMA7455L 典型應用：

　　Cell Phone/PMP/PDA: Image Stability, Text Scroll, Motion Dialing, Tap to Mute

　　HDD: Freefall Detection

　　Laptop PC: Freefall Detection, Anti-Theft

　　Pedometer

　　Motion Sensing, Event Recorder

　　圖1.MMA7455L簡化功能方框圖

　　圖2.MMA7455L I2C接口到MCU的連接圖

　　圖3.MMA7455L SPI接口到MCU的連接圖

　　圖4.MMA745xL評估板外形圖

　　圖5.MMA7455L I2C接口到MCU的連接電路圖

　　圖6.MMA7455L SPI接口到MCU的連接電路圖