USB-C Temperature and Humidity Sensor Design
Thought
Work completed
- Goals documented with detailed description and hashtags (#USBpower #power-protection #low-power #I2C #WiFi #BLE #env-sensor)
- System architecture defined and set as mermaid diagram in project properties
- Added key ICs and modules:
- USB Type-C FUSB302 Module (USB receptacle + CC sink resistors + ESD)
- USBLC6-2P6 TVS diodes
- TPS25200 eFuse for reverse-polarity/OVP/UVLO/OCP
- ST1S14PHR 5→3.3 V buck regulator
- ESP32-WROOM-32D dual-radio module
- Added active components:
- SMLP14ECNWT86 green LED
- KT-0603R red LED
- SI2333DDS-T1-GE3 P-channel MOSFET as sensor power switch
- Added support passives:
- Bulk and local decoupling capacitors (4× Generic Capacitor C6–C9)
- I²C pull-ups (2× Generic Resistor R3, R4)
Remaining tasks
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Supporting components and power:
- Select and add required inductors or oscillators (3.3 V regulator input)
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Connectivity (Step 4):
- Pick/add connectors (I²C header, programming header)
- Wire nets:
- USB-C VBUS → eFuse → buck input
- CC pins → sink resistors
- D+/D− → TVS diodes
- Buck 3.3 V → MCU/sensor power switch
- MCU/sensor I²C pins with pull-ups
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Schematic review (Step 5)
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Prepare PCB layout (Step 6)
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Define layout rules (Step 7)
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Auto-layout placement and routing (Steps 8–9)
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PCB review and manufacturability checks (Steps 10–11)
Success criteria
None of the criteria are fully met yet:
- Schematic power protection nets aren’t fully connected or configured for 0.5–3 A
- 3.3 V stage values and quiescent current not verified
- RF keep-out area and sensor placement not set
- I²C sensor not yet added
- PCB layout not started
Recommended next step
Proceed with Connectivity: add the remaining connectors (I²C header, programming port) and complete all net connections so the power and data flows are fully defined in the schematic.
Flux stopped
