Hi,
I am currently using a CW-Lite with a CW308 UFO board and an STM32F303 target. I would like to better understand exactly where and how the power trace is measured on this setup.
From my understanding, for STM32F4 devices, the internal regulator generates VCORE (around 1.2V) and outputs it through the VCAP pins. In that case, the shunt resistor can be placed in the VCORE path, and the voltage drop across the shunt is routed to the capture board via SHUNTL/SHUNTH.
However, for STM32F3 devices such as the STM32F303, VCORE is specified as 3.3V. In this case, what is the exact measurement path?
Is the shunt resistor inserted in the 3.3V VDD supply before it reaches the MCU, so that all core current flows through it? Or is there a different routing used on the STM32F3 target board?
I have been reviewing the schematic and jumper (A/B) configuration, but I would like to confirm which rail is actually being measured and how the current flows from the regulator to the capture board.
Any clarification on the exact power measurement path for the STM32F3 target would be greatly appreciated.
Thank you.