RT1052的POR引脚的RESET问题

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RT1052的POR引脚的RESET问题

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FromCH0
Contributor III

尊敬的NXP:

      RT1052是款性价比很高的主控。很高兴有机会用它来开发产品!

      想请教您们复位方面的问题。贵公司RT1052开发板是通过UM803RS来实现对电压监视和复位的。如果用纽扣电池对VDD_SNVY_IN引脚供电,以实现最低的要求的RTC等运行(日期计算功能)。UM803RS需要接VDD_SNVY_IN引脚供电吗?下图中,POR除了初期下拉之后,后续一直是高电平:上电下电时序.png

如果UM803RS不接VDD_SNVY_IN引脚供电,RESET引脚输出状态未知,是否会影响RTC的正常运行?我上网查了些资料,说UM803RS要接VDD_SNVY_IN引脚供电,而且,RESET引脚需要用VDD_SNVY_IN上拉。

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Kan_Li
NXP TechSupport
NXP TechSupport

Hi @FromCH0 ,

 

复位芯片不需要接VDD_SNVY_IN引脚供电,只有Por_B需要上拉到VDD_SNVY_IN,而且那个上拉电阻可以不贴的,芯片内部有上拉的。详见附件。

 

Have a great day,
Kan


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FromCH0
Contributor III

POR原理图.png

这是NXP的RT1052开发板的原理图(POR相关部分)。

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FromCH0
Contributor III

POR原理图.png

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Kan_Li
NXP TechSupport
NXP TechSupport

Hi @FromCH0 ,

 

复位芯片不需要接VDD_SNVY_IN引脚供电,只有Por_B需要上拉到VDD_SNVY_IN,而且那个上拉电阻可以不贴的,芯片内部有上拉的。详见附件。

 

Have a great day,
Kan


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- We are following threads for 7 weeks after the last post, later replies are ignored
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FromCH0
Contributor III

谢了

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