Raspberry Pi 4 Model B Full Schematic !!top!!

Why does this matter? Because the schematic shows the . You can see exactly which pins can handle PWM, SPI, I2C, or UART. It also shows the pull-up/pull-down resistor configurations, which is vital for debugging why a sensor isn't working as expected.

: Connected via a dedicated high-speed bus. Options include 1GB, 2GB, 4GB, or 8GB LPDDR4-3200 SDRAM. EEPROM (U5) Raspberry Pi 4 Model B Full Schematic

: Power is typically supplied via a USB-C connector. The official schematic shows the CC1 and CC2 lines used for power negotiation. Early revisions (v1.1) had a known design flaw in this circuit where they shared a single pull-down resistor, which was corrected in revision 1.2 . Why does this matter