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MSP430F5529: Current consumption at LPM4 using the MSP430F5529 LaunchPad

Part Number: MSP430F5529
Other Parts Discussed in Thread: ENERGIA

Hi Sir,

Customer used the MSP430F5529 launchpad to measure the current consumption of LPM4.

Development environment: Energia
Internal modules used: ADC, RTC, GPIO, etc

Current consumed by LPM4 with suspend()

・The USB is connected, and the jumper except GND is removed, and + 3.3V is applied to the MSP430
 result: 2.3 UA

・The USB is removed and the jumper except GND is removed, and + 3.3V is applied to the MSP430
 result: 70 UA (unstable)

The current consumption changes with or without USB connection.
I want to fix the current consumption by 2.3 UA, but please tell the reason and the solution that becomes 70 UA (unstable).
Thanks a lot.