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关于TPS3808复位门限的问题

Other Parts Discussed in Thread: TPS3808

HI3519A平台,板子上TPS3808监控0.8V核电压和1.8V接口电平,掉电触发门限分别设置的是0.61V和1.63V,批量做了没什么问题。后来反查1.8V要求的掉电门限在1.65V到1.68V之间,如果用固定电平监控芯片 tps3808G18的门限值为1.67V,请问TI专家这个1.67V是怎么得来的?