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TPS3828-3.3 REST引脚一直输出低

TPS3828-33的RESET引脚通过10K电阻上拉至1.8V,给芯片供电电压为3.3V,但是RESET引脚却一直输出为低,按照原理,应该是上电有个复位,然后D级不导通S级,WDI处于高阻态看门狗自己喂狗直到WDI引脚被给与信号。不明白为什么RESET引脚一直为低。TKS!