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血氧AFE44X0评估板问题



我想问下AFE44x0SPO2EVM users guide 说明里面 设计框图里好多器件都是用虚线画出来的,这部分器件(比如Accelerometer、SD CARD)在它的物料清单里都是显示0个,但是电路原理图上确实是有的,而且起到了一定作用,这是怎么回事,上面所说的加速度计在TI上找不着相关资料