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2812 外部接口片选信号XCS2低电平信号不对

我在程序里对外部地址0X080008写数据0X0020,结果通过示波器测得片选信号XCS2低电平信号为500mV,高电平为3.3V,数据引脚和地址引脚也是如此,但是查2812的数据手册发现低电平的典型值为200mV,最大为400mV。想问一下高手这是什么原因导致的。补充说明一下我对GPIO口操作高低电平又满足手册要求。