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ADS8568模拟电源和数字电源上电时序问题

Other Parts Discussed in Thread: ADS8568

在调试ADS8568时,出现DVDD上电,但是AVDD为正常供电的情况。结果就是CPU与ADC连接的并口,因为被ADC拉死,导致CPU无法启动。

ADS8568模拟电源和数字电源两个电源,根据datasheet描述,AVDD为IC工作电源,DVDD为数字接口电源,现在以下几个疑问:

1)当AVDD先供电,IC启动工作,DVDD位上电,此时数字接口处于什么状态?是否为高阻

2)如果DVDD先上电,数字接口开始工作,但此时IC未工作,此时数字IO处于什么状态?