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DRV8305 shunt amplifier的问题

Other Parts Discussed in Thread: DRV8305

本人使用TMS28069进行DRV8305驱动器控制,通过SPI配置DRV8305寄存器。

不启动shunt amplifier工作时,TMS28069采集到的电压为1.68v,似乎满足V0=VREF/K-G(SN-SP)公式。(K默认为2,精密电阻7毫欧),

当我启动shunt amplifier时,无论是设置k=2、4、6、8还是G=10v/v、40V/v、80V/v,TMS28069采集到的电压都为1.72v.

请教各位遇到这种情况没有?通过SPI查询8305寄存器信息,反馈回来都已经配置成功