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•Created by Sterling on 8/28/2024 in #pcb-and-analog

Measuring Current Consumption on STM32 Nucleo-64: JP6 Jumper Behavior and Ammeter Use

Hi guys, how can I properly measure the current consumption of the microcontroller on my STM32 Nucleo-64 evaluation board (NUCLEO-L073RZ)? The manual instructs me to remove the JP6/IDD jumper and connect an ammeter in series between the pins to measure the current. However, when I remove the JP6 jumper without connecting the ammeter, the microcontroller continues to operate, allowing me to debug and communicate via I2C. I expected that removing the JP6 jumper would cut the power to the microcontroller, making it inaccessible unless an external power supply was used. Can someone explain where I might be wrong? Additionally, if I measured any current using the ammeter, I’d like to understand if the observed values align with expectations. For reference, here is the link to the STM32 Nucleo-64 manual, specifically page 23: STM32 Nucleo-64 Manual

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