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i.MX6ULL Power-Down Sequence VDD_HIGH_IN should be turned on before VDD_SOC_IN

Question asked by 健鸿 凌 on Nov 12, 2018
Latest reply on Nov 14, 2018 by Wigros Sun

1. 在IMX6ULLIEC手册描述到的掉电时序中,要求VDD_SOC_IN电源需要早于VDD_HIGH_IN电源掉电,但实测原厂的评估板核心板(SCH-29364 REV.A)及底板(SCH-28616 C2)发现掉电时序没有符合该点要求,请问,i.MX6ULL是不是对上电时序要求相对严格,对掉电要求可以不考虑?下图为上下电测试图:

 

01. 上电时序图

 

 

02. 掉电时序图

 

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