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AFE4490晶振不起振

Other Parts Discussed in Thread: AFE4490

请问TI大牛们,AFE4490正常工作时晶振是什么状态?  目前我的现象是:用微处理器通过SPI往AFE4490的某个寄存器写一个数据,也能正常读出寄存器的数据,数据也是正确的,但是测量晶振无反应, AFE4490的CLKOUT脚输出高电平。