graph LR; subgraph "Externe Quelle" USB_C(USB-C Port); end

subgraph "Ihr Power Profiler"
    BQ[BQ25672];
    STM32[STM32L4];
    DCDC[3.3V Buck-Boost];
    Akku[(Li-Ion Akku)];
end

USB_C -- VBUS / D+ / D- --> BQ;
USB_C -- CC1 / CC2 --> STM32;
BQ -- I2C --> STM32;
BQ -- VSYS --> DCDC;
BQ <--> Akku;
DCDC --> STM32;