USB-C Sensor Node
Worked for 4 mins 27 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 5 sec
The schematic is complete and electrically checked, including USB-C protection, TPS25940 reverse-blocking eFuse, 3.3 V buck supply, SiWG917 radio module, SHT41 sensor, and debug interfaces.
I can’t execute board setup or placement because no ACUs are currently available. Remaining work:
- Define board dimensions and a standard 4-layer stackup.
- Place the SiWG917 antenna at a board edge with its all-layer copper/component keepout.
- Place the SHT41 at an airflow-exposed edge, thermally isolated from the MCU, buck regulator, inductor, LED, and USB-C connector.
- Group USB-C ESD/eFuse parts near the connector and keep the buck switching loop compact.
- Run placement DRC and review antenna, thermal, mechanical, and routing clearances.
Set up and place
Document layout constraints
Request board constraints
