Vin是要测量的外部电池的电压,
ADin 是 CC2541的AD引脚 P04
项目需求是通过CC2541的 AD 测量出电池电压. 为了低功耗 没有采用分压式,而是电池电压通过R接入AD脚, 将R的值调至50K,(C=0.1uF) 发现调节R的数值改变得到的AD值也跟着变..... 难道芯片是测电流不是电压么?? 输入的电压没有变的, AD怎么就变了.. 而且当R达到1M后, AD就一直为0.
Vin 和 AD值 之间是什么转换公式呢 (Vin是恒定的情况下,为什么不同的R值会影响AD)
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