TI中文支持网Part Number:BQ76952Other Parts Discussed in Thread:BQSTUDIO,
如图所示，人为将VC3的引脚和电芯连接线剪断。
此时通过bqstudio读取到的Cell 3电压为-316mV、Cell 4电压为-6058mV。
理论上Cell 3 + Cell 4约等于 +6200mV 才是正确的。
请问这种情况下BQ76952内部是怎么对电压ADC值进行处理的？为什么会出现负值？
Star Xu：
您好，由于问题比较复杂，我需要询问更了解这款芯片的TI工程师，再帮您解答，稍后回复
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SD Han：
谢谢您，我还有一个问题也请教一下：e2echina.ti.com/…/bq76952-bq76952-ts2
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Star Xu：
您好，请参考下面答复
The situation with one cell at or below 0 and the next at high voltage is common of a disconnected cell input. Look for an open on the VC3 pin, its filter resistor or the wire to the cell. On an EVM look for a missing or damaged cell simulator shunt. The VC3 input will float or be pulled below the VC2 input and the input will go negative. Cell 4 reaches a maximum value then rolls over to a negative number. The ADC is 24 bits, above 7FFFFF or 8388607 or about 6.06V, the value rolls over to 0x800000 and is a negative number.
When the cell voltage is lower and the 2x cell voltage from the open wire does not exceed 6V the reported value stays a positive value.
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SD Han：
您好，根据您的回答，采集线VC3断开后应该是如上图所示的情况吧。
请问断线后的电压X，它会有个范围吗？
我们需要对此类异常数据做一定的处理，谢谢！
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Star Xu：
您好，请参考下面的内容。
The open wire will pull down on the disconnected pin. The lower of the cells, cell x will read about -0.3V as shown. At lower cell voltage (up t approximately 2.9V) the upper of the cells, cell (x + 1) will read about twice the cell voltage + 0.3V up to 6V, then it will roll over to -6 V as you pictured above
