USB-C Sensor Node

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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:
  1. Set board size/stackup and move into PCB placement.
  2. Place U1 at the board edge with antenna keepout and U4 away from heat sources.
  3. Route power, buck, I2C, SWD/UART, and USB-C protection paths.
  4. Assign final passive MPNs and run full DRC/manufacturing checks.

flux

The schematic is complete with 46 components and 31 nets: SiWG917 Wi‑Fi/BLE, SHT41 sensor, protected USB‑C input, TPS25940 reverse-blocking eFuse, MP28301 3.3 V buck, ESD protection, controls, and debug access. Documentation for requirements, firmware, bring-up, and regulatory planning was also created.
Remaining work:
  • PCB outline, stackup, placement, and routing
  • SiWG917 antenna keepout and SHT41 thermal isolation
  • Final passive MPN assignment
  • PCB DRC and manufacturing validation
  • Review the attached text and apply any requested changes
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Review attached requirements
Set up board placement
Finalize passive BOM
Plan critical placement
Check design issues
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USB-C WiFi BLE TH Sensor

USB-C WiFi BLE TH Sensor thumbnail
Consumer USB-C powered environmental sensor node with Wi-Fi, BLE 5.x, digital temperature/humidity sensing, protected 5 V input, and a 3.3 V low-power MCU/sensor rail.

Properties

WiFi

USB-C

Consumer IoT

5

V

Bluetooth

Pricing & Availability

Distributor

Qty 1

Arrow

$4.10–$6.66

Digi-Key

$0.00

HQonline

$3.72–$3.82

LCSC

$5.53–$5.70

Mouser

$26.56

TME

$1.03

Verical

$5.53–$8.26

Controls