在做cc2640开发，为了尽量降低功耗，姜传感器数据放在广播数据里面发送。做了个最小系统，用纽扣电池供电，用示波器看纽扣电池的压降，发现如下图结果：
发现电池电压周期性的被拉低。我直接把广播关闭了，POWER_SAVING宏定义也打开了，为什么电池电压还会有周期性的压降呢？求解
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