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能耐多高电压?

Other Parts Discussed in Thread: MSP430F149

使用芯片:MSP430F149,用其A/D转换器采样高压电源电压大小,因电路设计,测量点不能仅仅采取电阻分压的办法,还需测量点为“悬浮”状态,即单片机内部A/D转换器模拟输入端采取浮地的措施。但“浮”起来后,A/D转换器的输入与输出(包括单片机的地)之间就有比较大的压差,不知此MCU最高能承受多大的压差。其他型号的MCU呢?