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FDC2214: 单端电容计算

Part Number: FDC2214

各位工程师你们好!
我想请教下FDC2214单端模式电容计算的问题,我使用的是外部晶振40MHz,寄存器地址0x14-0x17设置为0x2001,我想请教下图中我的计算方法有误吗,计算出的电容单位是PF还是NF还是F呢?(因为我换算为PF后,将直插电容一端接入CH0,一端接入GND发现数值的位数不对),我按照如下图1的计算方式算PF,最后的显示结果一直为-33(图2)