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MSP430FR2633: MSP-CAPT-FR2633 Development Kit works abnormally when powered on at 2.15V

Part Number: MSP430FR2633


I tested low power consumption with MSP-CAPT-FR2633 Development Kit ,and the development board used the default software.

When the standby power is adjusted from 3.0V to 2.0, the standby power consumption can reach about 3UA. At this time, the FR2633 can work normally. 

when the board is directly powered  on at 2.15V, the current is always running within 500-900UA.  It seems that MSP430 has not been working properly, how to solve it?

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