FreescaleMMA7660FCZSTAR3无线传感器设计方案  2012/3/1

         Freescale 公司的MMA7660FCZSTAR3无线传感器采用MMA7660FC传感器和MC13213MCU. MMA7660FC是±1.5 g 3轴带数字输出(I2C)的加速度计,是非常低功耗的小型容性MEMS,具有低通滤波器, 0g失调和增益误差补偿,能以用户可配置的取样速率(1-120次/秒)转换成6位数字值,模拟工作电压2.4V-3.6V,数字电压1.71V-3.6V.而MC13213采用40MHz HCS08 低压低功耗的内核,有60 KB 闪存和4KB RAM存储器,多个16位计时器,工作电压2V-3.4V. ZSTAR3无线传感器主要应用在手机/PMP/PDA,便携式PC,游戏机和数码相机.本文介绍MMA7660FC和MC13213主要特性,方框图以及802.15.4 标准调制解调器方框图, ZSTAR3 传感器板方框图,电路图和材料清单(BOM).

The MMA7660FC is a ±1.5 g 3-Axis Accelerometer with Digital Output (I2C). It is a very lowpower, low profile capacitive MEMS sensor featuring a low pass filter, compensationfor 0g offset and gain errors, and conversion to 6-bit digital values at a user configurable samplespersecond. The device can be used for sensor data changes, product orientation, and gesture detection through an interruptpin(INT). The device is housed in a small 3mm x 3mm x 0.9mm DFN package.

MMA7660FC主要特性:

• Digital Output (I2C)

• 3mm x 3mm x 0.9mm DFN Package

• Low Power Current Consumption: Off Mode: 0.4 μA, Standby Mode: 2 μA, Active Mode: 47 μA at 1 ODR

• Configurable Samples per Second from 1 to 120 samples a second.

• Low Voltage Operation:

– Analog Voltage: 2.4 V - 3.6 V

– Digital Voltage: 1.71 V - 3.6 V

• Auto-Wake/Sleep Feature for Low Power Consumption

• Tilt Orientation Detection for Portrait/Landscape Capability

• Gesture Detection Including Shake Detection and Tap Detection

• Robust Design, High Shocks Survivability (10,000 g)

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