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LAUNCHXL-CC1350-4: CC1350 power line slowly low down after remove battery ????

Part Number: LAUNCHXL-CC1350-4
Other Parts Discussed in Thread: CC1350

Hi, expert!

I used CC1350 chip on one board and MSP430 to another one. I used uart to communicate 2 borads. But after i disconnect 3V battery from CC1350 board(MSP430 is still keep living) power line in cc1350 board slowly down to 0V. All the parameter is under the range in " Absolute Maximum Ratings ".  Cuold you tell me what is the problem? How can i solve it?

Thank you!