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 6 sec
The schematic is complete with 46 components and 31 nets, including USB-C protection, TPS25940 eFuse, MP28301 buck regulator, SiWG917 Wi‑Fi/BLE module, SHT41 sensor, debug controls, and supporting passives.
Auto-layout could not be run because no ACUs are currently available. Remaining work:
- Inspect the existing PCB state to determine whether placement, routing, or both are needed.
- Set or verify the board outline and stackup.
- Place the SiWG917 at a board edge with its antenna keepout.
- Thermally isolate the SHT41 from the MCU, regulator, inductor, and USB-C connector.
- Place power and decoupling components close to their associated pins.
- Route all nets and resolve airwires and DRC errors.
- Assign final passive MPNs before manufacturing export.
Thought for 2 sec
Auto-layout is still blocked because no ACUs are available, so I cannot inspect or modify the PCB in this session.
Current state: the 46-component schematic is complete; PCB placement/routing still needs assessment and likely execution, including SiWG917 antenna-edge placement/keepout, SHT41 thermal isolation, power-stage placement, routing, and final DRC.
Review U1 antenna keepout
Check placement and DRC
Place critical components
Create bring-up plan
