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LAUNCHXL-CC1310: StandBy mode will have periodic pulse current

Part Number: LAUNCHXL-CC1310
Other Parts Discussed in Thread: CC1310

Tool/software:

IC: CC1310
SDK: simplelink_cc13x0_sdk_3_20_00_23
IDE:IAR
EXAMPLE :C:\ti\simplelink_cc13x0_sdk_3_20_00_23\examples\nortos\CC1310_LAUNCHXL\drivers\pinStandby
I only use this routine to test low power current, low power current will have periodic pulse current output, is this a normal phenomenon? If so, is there any way to turn off this pulse current? thank you!
I only used StandBy mode and GPIO initialization and wake up functions were disabled.