6DR1900-5

6DR1900-5

6DR1900-5

《联系人；欧先生》
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针对一些高要求的应用程序，传感器的运行模式可以迅速更换，只在真正有需要时,才会提高分辨率和数据传输速率。有些传感器甚至能够自动转换模式。客户可自行配置活动状态下所需要的分辨率和数据传输速率，并自定义启动它的条件。这时传感器会进入静止状态，但仍会继续测量数据，并以极低的数据传输速率和分辨率进行，等出现设定条件(动作事件)才切换回到启动状态。

另一个不错的设计原则是利用低供电水平，因为较低的供电水平也意味着更低的电流消耗。这就是为什么对于低功率的应用，1.8V电源是首选。

在某些设计中，可以使用传感器的功率循环。传感器的电源只有在需要测量时才会被激活，否则传感器就会处于关闭状态。我们可以通过从微控制器的引脚上提供传感器的电源来实现。如图2所示。在应用这种技术时，需要正确的计算功耗预算，因为每个传感器的启动都需要对其进行配置和等待，直到输出被确定，并提供正确的数据。

图2：透过为控制微控制器针脚控制传感器电源供应

大多数MEMS加速计都是数字传感器，这代表它们可以将测量的模拟信号转换成数字数据。因为有集成的模拟信号转换器，加上对信号失真的敏感度较低，物料清单项目得以减少，但这并不是唯一的优点。嵌入的中断生成器MEMS加速计可以在满足用户设定的参数条件发生时，产生触发信号，这就是用动作感应唤醒功能的方式。微控制器(MCU)配置传感器来产生一个唤醒触发器，并进入功耗极低的睡眠模式。当一个动作被检测到是，传感器会产生一个中断信号，MCU接到信号后会切换到一个合适的操作模式，然后处理刚刚发生的情况。

数字传感器也可以接管有微控制器执行的运动处理有关的任务。MCU当然可以执行相同的工作，但是功率效率要低得多——MCU的耗电是一毫安计算，传感器则是微安。检测自由落体、单点、双击(用户动作类似鼠标点击)、人像/景观方向检测等，是通过传感器内部逻辑实现的。MCU不需要进行任何计算，只需要等待一个中断触发，并且只在它发生时对动作作出反应。

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