Raspberry Pi Project Help
Thought for 7 sec
For a Raspberry Pi 4 USB‑C power input using STUSB1602A, connect the USB‑C CC pins to the STUSB1602A, not with simple 5.1kΩ pull-downs. The 5.1kΩ Rd resistors are only for a plain sink port when no Type‑C controller is handling CC; controller ICs such as STUSB1602A handle CC internally/actively .
Basic connection:
Text
USB-C receptacle STUSB1602A ---------------- ---------- CC1 -----------------------> CC1 CC2 -----------------------> CC2 VBUS -----------------------> VBUS sense / power-path input GND -----------------------> GND Shield ----------------------> Chassis/GND via ESD strategy
For a Pi 4 power input:
Text
USB-C VBUS | +-- TVS to GND | +-- low-R protection / load switch / current-limit switch | +-- 5V rail to Raspberry Pi 4 5V pins
Key notes:
- Do not tie CC1 and CC2 together.
- Do not add external 5.1kΩ CC pull-downs unless the STUSB1602A datasheet/reference design specifically calls for them.
- The Pi 4 needs a robust 5V / ~3A path, so avoid high-resistance fuses or diode drops that pull VBUS below the Pi’s acceptable input range.
- If you are only making a Pi HAT powered by the Pi’s 40-pin header, you usually don’t need the STUSB1602A at all.
- If your board is intended to power the Pi from USB‑C, use the STUSB1602A to detect/handle Type‑C current capability, then gate/protect VBUS before feeding the Pi. USB‑C without PD can advertise up to 3A at 5V, but the design must read/handle CC current advertisement rather than blindly drawing 3A .
So the short answer: USB‑C CC1 → STUSB1602A CC1, USB‑C CC2 → STUSB1602A CC2, no tying together, no standalone Rd resistors unless the STUSB1602A reference circuit says so.
Full sink schematic
Check datasheet requirements
Add protection parts
Find USB-C connector
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