Raspberry Pi 4 Model B Full Schematic !link!

When designing a HAT for the Pi 4, you cannot just copy the Pi 3 schematic. The Pi 4 has different voltage tolerances.

Deep Dive into the Raspberry Pi 4 Model B Schematic: Architecture, Subsystems, and Hardware Engineering Raspberry Pi 4 Model B Full Schematic

– GPIO, I2C, SPI, PWM, etc. register-level info. When designing a HAT for the Pi 4,

port is now truly gigabit-capable. Previous models were limited because the Ethernet was routed through the USB 2.0 bus, but the Pi 4 schematic gives it its own dedicated interface to the SoC. The standard 40-pin header and Hardware Engineering – GPIO

Despite the lack of a 1:1 trace-level schematic, the official reduced schematics and the BCM2711 Datasheet reveal several core subsystems: