怎么使用ADC Delsig来测量系统中车载电池的电池容量

你好，
在我的设计中，我试图使用ADC Delsig来测量系统中车载电池的电池容量，通过使用PSoC中的ADC Delsig组件将电池输入电压转换成数字值，然后基于输出计算剩余电池寿命。
我正在测量的电池有一个输入范围的PSoC为2.2 - 2.8 VDC。我的板有VDDA连接到+5VDC，所以我配置Delsig的输入范围为单端，输入范围为“VSSA到Vdda”。然而，当我进行这些设置时，Delsig的VREF被自动设置为“内部VDDA或4”或1.25伏。
当ADC的基准电压设置为VDA/4时，ADC Delsig如何精确地测量VSSA的电压输入范围到Vdda？ADC的参考电压是否需要大于最大输入电压？
谢谢您。



     以下为原文
  Hello,
     
    In my design I am trying to use to the ADC Delsig to measure the battery capacity of an on-board battery in my system by converting the battery input voltage to a digital value using the ADC Delsig component in the PSoC and then calculating the remaining battery life based on the output.
     
    The battery I am measuring has an input range to the PSoC of 2.2 - 2.8 VDC.  My board has Vdda connected to +5VDC, so I configure the input range of the delsig to be single ended with an input range of "Vssa to Vdda."  However, when I make these settings, the Vref of the delsig is automatically set to "Internal Vdda / 4" or 1.25 volts.
     
    How can the ADC delsig accurately measure a voltage input range of Vssa to Vdda when the reference voltage for the ADC is set to Vdda / 4?  Doesn't the reference voltage for the ADC need to be greater than the maximum input voltage?
     
    Thank you.