MMA8451Q：低功耗三轴加速度传感器，灵活配置与节能方案

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"Freescale Semiconductor的MMA8451Q是一款专为低功耗和高性能设计的三轴加速度传感器，它在小型3mm x 3mm x 1mm QFN封装中集成了一系列先进的功能。这款14位/8位数字加速度计具有出色的1.95V至3.6V供电范围，同时支持1.6V至3.6V的内部电压操作，确保了在各种应用中的灵活性。 MMA8451Q的核心特点是其内置的14位分辨率，提供了极高的测量精度，这对于需要高精度运动检测的应用来说是至关重要的。它的设计注重能效，通过嵌入式中断功能，能够实现智能的数据采集策略，无需主机持续监控，从而大幅度降低功耗。用户可以根据需求灵活配置两个可编程中断引脚，这在实时处理加速度变化、防止数据溢出或检测冲击（如jolt检测）时非常有用。该设备还具备低通滤波和高通滤波两种数据输出模式，前者适合平滑信号处理，后者则适用于快速动态响应，简化了数据解析过程。此外，MMA8451Q具有强大的事件监测能力，能够根据预设的组合配置，生成用于唤醒设备的惯性中断信号，使得在设备处于休眠状态时也能及时响应外部动作。 MMA8451Q是一个理想的解决方案，适用于那些对能耗敏感、对加速度测量精确度要求高的工业级应用，如穿戴设备、无人机导航、车辆安全系统等。对于同系列的其他芯片，用户也可以参考这份手册来了解相似产品的特性，以便做出最佳选择。"

MMA8451Q

Sensors

10 Freescale Semiconductor, Inc.

3 Terminology

3.1 Sensitivity

The sensitivity is represented in counts/g. In 2g mode the sensitivity is 4096 counts/g. In 4g mode the sensitivity is 2048 counts/

g and in 8g mode the sensitivity is 1024 counts/g.

3.2 Zero-g Offset

Zero-g Offset (TyOff) describes the deviation of an actual output signal from the ideal output signal if the sensor is stationary. A

sensor stationary on a horizontal surface will measure 0g in X-axis and 0g in Y-axis whereas the Z-axis will measure 1g. The output

is ideally in the middle of the dynamic range of the sensor (content of OUT Registers 0x00, data expressed as 2's complement

number). A deviation from ideal value in this case is called Zero-g offset. Offset is to some extent a result of stress on the MEMS

sensor and therefore the offset can slightly change after mounting the sensor onto a printed circuit board or exposing it to

extensive mechanical stress.

3.3 Self-Test

Self-Test checks the transducer functionality without external mechanical stimulus. When Self-Test is activated, an electrostatic

actuation force is applied to the sensor, simulating a small acceleration. In this case, the sensor outputs will exhibit a change in

their DC levels which are related to the selected full scale through the device sensitivity. When Self-Test is activated, the device

output level is given by the algebraic sum of the signals produced by the acceleration acting on the sensor and by the electrostatic

test-force.

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