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afe4400 睡眠时拉低SPI_SOMI引脚电平?

Other Parts Discussed in Thread: AFE4400

你好,

           请问,为什么afe4400进入睡眠状态时,居然会将SPI_SOMI引脚电平拉低?

           spi总线上带有两个spi从设备,当我将afe4400的AFE_PDN引脚拉低时,afe4400进入睡眠状态,但其SPI_SOMI引脚却将共用的数据总线将电平从3.3v拉低到1.6左右,导致单片机无法识别此电平,因而无法读到另一个从设备的数据!这是什么原因?