USB-C Sensor Node
Worked for 4 mins 33 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.
Set up the board size and stackup, then place the components for RF and thermal best practices.
Thought for 4 sec
The schematic and supporting design files are complete, but PCB setup and placement could not be started because no ACUs are currently available.
Remaining work:
- Define board dimensions and stackup.
- Place the SiWG917 at a board edge with its antenna keepout fully clear.
- Thermally isolate the SHT41 from the MCU, regulator, USB-C connector, and power path.
- Cluster USB-C protection and buck components for short high-current loops.
- Verify placement clearances, antenna constraints, and unrouted-net DRC.
Inspect board setup
Document placement constraints
Check design rules
