Power Supply Circuit Analysis
Thought for 44 sec
Placed 2 component(s): F5, D54
Thought for 2 sec
Work done
- Positioned F5 and D54 at the left board-edge input area, matching the CN1/VIN entry location inferred from the provided power schematic.
- Placed D54 directly beside F5, with its K/cathode facing the protected
VINSside and A/anode oriented towardGND. - Verified the placement is within the board and does not introduce overlap or boundary issues.
- ✅ F5 and D54 adjacent to input connector area: Completed.
- ✅ VIN/VINS/GND airwire shortened: Completed by moving the parts together near the input edge.
- ❌ Remaining airwire fully routed: Not completed; one
VINSairwire remains between F5 and D54. - ✅ ERC clean for this change: No active ERC issues were reported.
- ❌ DRC clean for this change: Not clean yet because the remaining airwire is still reported.
The remaining action is to route the short
VINS connection between F5 and D54 on the PCB. After that, rerun the board checks to confirm the airwire is cleared.Route VINS airwire
Widen input trace
Locate VINS airwire
Verify D54 orientation
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USB-C WiFi/BLE Temperature-Humidity Sensor Node Specification
Requirements
- Consumer-grade environmental node measuring temperature and relative humidity.
- USB-C 5 V default-sink input compatible with 0.5–3 A sources.
- Ultra-low-power dual-radio MCU/module: Wi-Fi 2.4 GHz 802.11 b/g/n and BLE 5.x.
- Digital T/RH sensor on I2C.
- Input protection: reverse-current/reverse polarity behavior, OVP, UVLO, OCP, and ESD protection.
- Regulated 3.3 V rail for MCU and sensor.
Architecture
USB-C receptacle -> CC Rd resistors and ESD/TVS -> protected 5 V eFuse/load switch -> 3.3 V regulator -> ESP32-S3 module + I2C T/RH sensor + debug/program header.
Engineering Defaults
- Use an ESP32-S3 module for integrated RF matching, flash, and antenna.
- Use I2C for the temperature/humidity sensor.
- Use a protected load switch/eFuse for OVP/UVLO/OCP and reverse-current blocking on the USB VBUS path.
- Place the ESP32 antenna at a board edge with antenna keepout; place the T/RH sensor away from regulator/protection heat sources.
Requirements
Architecture
Engineering Defaults
