USB-C Sensor Node
Worked for 4 mins 28 sec
Implemented the schematic for the USB-C powered Wi‑Fi/BLE temperature/humidity node. It uses a SiWG917 Wi‑Fi/BLE 5.4 module, SHT41 T/RH sensor, USB-C sink input, TPS25940 true reverse-blocking eFuse with OVP/UVLO/OCP/soft-start, MP28301 3.3 V buck regulator, ESD protection, reset/ISP/SWD debug, I2C pull-ups, and status LED.
Created project files:
Open items:
- PCB layout/routing is not done yet, so airwire DRC errors are expected.
- Generic passives still need final manufacturer MPNs before manufacturing export.
- Layout must enforce the SiWG917 antenna keepout and thermal isolation around the SHT41.
Suggested next steps:
- Set board size/stackup and move into PCB placement.
- Place U1 at the board edge with antenna keepout and U4 away from heat sources.
- Route power, buck, I2C, SWD/UART, and USB-C protection paths.
- Assign final passive MPNs and run full DRC/manufacturing checks.
Thought for 7 sec
The schematic is complete with 46 components, including the SiWG917 radio module, SHT41 sensor, protected USB-C input, TPS25940 eFuse, and MP28301 buck regulator.
I can’t configure the PCB or place components because the account currently has no available ACUs, so AI execution is unavailable. Remaining work:
- Choose and set the board dimensions and layer stackup.
- Place the SiWG917 at a board edge with its antenna facing outward and the full antenna region free of copper, traces, wiring, screws, and conductive materials.
- Keep the SHT41 at an airflow-exposed edge, thermally isolated from the MCU, buck regulator, inductor, USB-C connector, and LED.
- Keep the buck power loop compact and away from both the sensor and antenna.
- Place USB-C protection directly behind the connector and decoupling capacitors beside their associated pins.
- Run placement DRC, then confirm placement before routing.
Recommend board setup
Define antenna keepout
Create placement checklist
Check placement constraints
Waiting for input
