USB-C Smart Sensor Node Design
Worked for 2 mins 12 sec
Requirements and the initial power budget are now captured in project files. I selected an ESP32-C3 module, SHT40 sensor, TPS25940 eFuse protection, and TPS62840 low-IQ buck regulator sized for Wi-Fi peaks.
Worked for 2 mins 30 sec
I ran out of execution credits before I could finish wiring and validating the schematic.
Completed so far:
- Renamed the project to USB-C ESP32 Environmental Sensor Node and updated the description.
- Created project files:
- Project Specification
- Power Budget
- Selected and added the main schematic components:
- ESP32-C3-MINI-1-N4 Wi-Fi/BLE MCU module
- SHT40 temperature/humidity sensor
- TPS25940 eFuse for reverse/OVP/UVLO/OCP protection
- TPS62840 750 mA ultra-low-IQ buck regulator
- USB-C receptacle
- USB data ESD protection
- VBUS TVS diode
- Reset and boot buttons
- Status LED
- Buck inductor
- Consulted datasheets for ESP32-C3, SHT40, TPS25940, USB ESD, and VBUS TVS.
Remaining work:
- Fetch/verify the TPS62840 datasheet using a corrected URL.
- Add all required support passives: buck caps/VSET parts, eFuse ILIM/OVP/UVLO/dVdT parts, USB-C CC resistors, I2C pull-ups, MCU/sensor decoupling, EN RC, LED resistor.
- Wire all nets.
- Mark unused ESP32/module pins correctly.
- Run schematic review/ERC and fix violations.
- Create firmware starter and board bring-up project files.
- After schematic is clean, ask for confirmation before moving to layout.
Finish schematic wiring
Calculate buck passives
Complete USB-C input
Run design review
Add firmware notes
