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INA226: 关于INA226 测量shunt电流的问题

Part Number: INA226
Other Parts Discussed in Thread: BQ79616, INA281

咨询个INA226使用的问题:

1、储能系统,使用BQ79616菊花链作电芯电压和温度的测量。想使用INA226测量shunt电流,电路如下图所示: shunt 阻值10mΩ,电流满量程±60A。

2、储能系统接负载放电时,60A电流从左向右流经shunt。 假设电池C1负极是GND(0V),  那么   (VIN+ – VIN-) =60A*10mΩ=600mV;  VIN- 是GND (0V),VIN+是600mV。 

3、储能系统接充电机充电时,60A电流从右向左流经shunt。 电池C1负极是GND(0V),  那么   (VIN+ – VIN-) = -60A*10mΩ= -600mV;  VIN- 是GND (0V),VIN+就是-600mV

4、手册上有注明:IN+ and IN– may have a differential voltage between –40 V and 40 V. However, the voltage at these pins must not exceed the range –0.3 V to 40 V.   

5、想问下,充电时VIN+ (-600mV)是不是已经超出–0.3 V to 40 V这个使用范围啦?  这样使用是不是有问题?  如有问题您推荐怎样修改?

6、如果我们想用shunt测量电流,您有没有其他更适合的方案可以推荐?谢谢