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TPS3421: Issue about push button

Part Number: TPS3421

Dear Teams,

My customer has following testing and results:

Target function: When push two button, it should be reset. 

Background: PB1 connect to HOME push button, and PB2 connect to a power-down button. When press the PB2 to switch off the system first of all, then customer press the PB1 button many times. At this scenario, it won't trigger reset for all times, and only sometimes it will trigger reset.

Could you give some suggestions and comments?

Thanks!

Dylan