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CPU resets after inserting adaptor

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ricky_wcy

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Conditions:
CPU = 3V - 3.6V
Battery = 3V
Adaptor = 6V

Problems:
For adaptor (6V), a 3.6V regulator and SS12 are used to provids about 3.3V
For battery (3V), a 3.3V DCDC is used to provide 3.3V

When user insert OR remove adaptor, the CPU reset because
it drops to 2.5V

Suggestions:
Any generic cirucit that can both use 3V and 6V ?
Any method to solve it?
 

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