WiFi & Bluetooth Sensor Node
Worked for 3 mins 19 sec
6/6 Run schematic/design checks and fix actionable issues
Rename project, create specification, and record initial requirements/power budget
Select library parts for MCU, T/RH sensor, USB-C input, regulator, and protection
Add main components and supporting passives to the schematic
Wire USB-C power/protection, 3.3 V rail, MCU boot/debug, USB data, I2C sensor, and indicators
Create firmware/regulatory/bring-up project files
Run schematic/design checks and fix actionable issues
Thought for 46 sec
Reading project docs.
Getting a BOM overview.
Completed 11 design checks — found 114 issues.
Thought for 42 sec — Verifying eFuse features
Read U2, TPS259530DSGT datasheets.
Thought for a moment
Searching for eFuse solutions
I need to address the issue with TPS2596 that requires fixing since the user needs the reverse. It looks like I have to replace or add an ideal diode. To do that, I should search for a part with back-to
Working for 10 hrs 30 mins...
Thought for 47 sec — Searching for eFuse solutions
Found 4 results for TPS25942.
Found 3 results for TPS25944.
Found 3 results for Find eFuse with true reverse current blocking back-to-back FET for 5 V USB-C input, includes OVP UVLO OCP adjustable current limit around 1 A, available in Flux library, active SMD part. Candidate TI TPS25942 TPS25944 or similar..
Thought for 43 sec
Thought for 18 sec — Planning component replacement
Read TPS25940LRVCR tps25940.pdf.
Thought for 1 min 36 sec
Thought for 28 sec — Calculating resistor values
Added U2 and R15 and removed U2.
Thought for a moment
Reading schematic details for U2.
Thought for 25 sec
Set properties on R3, R5, R6 and 1 more.
Thinking...
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Technical Construction File — USB-C WiFi BLE TH Sensor
Status
Draft — schematic-stage regulatory file.
Applicable Regulations
- FCC Part 15 intentional radiator / unintentional radiator
- CE RED for EU radio equipment
- ISED Canada if sold in Canada
- UKCA if sold in the UK
- RoHS/REACH for consumer production
Product Description
USB-C powered indoor consumer temperature/humidity sensor node using a Silicon Labs SiWG917 Wi-Fi/BLE module and Sensirion SHT41 digital T/RH sensor.
Wireless Technology Summary
Table
| Module | MPN | Technology | Frequency Band | Antenna | Notes |
|---|---|---|---|---|---|
| U1 | SIWG917Y111MGABAR | Wi-Fi 2.4 GHz 802.11 b/g/n/ax + BLE 5.4 | 2.4 GHz ISM | Integrated antenna variant | Must follow Silicon Labs integration/keepout guidance |
Required Documentation Checklist
- Product block diagram — included in Project Specification
- Draft BOM from schematic — available in Flux BOM
- RF integration notes — included below
- Draft Declaration of Conformity — created in this file
- User manual outline — included below
- Final schematic PDF export
- Final PCB layout/Gerbers after layout
- Module certification grants and integration manual from Silicon Labs
- EMC/RF test reports from accredited lab
- Final product labels with FCC/CE/UKCA marking
RF Design Notes
- U1 must be placed at a PCB edge with the integrated antenna facing outward.
- Keep the antenna clearance void of copper, traces, vias, components, and metal on all layers.
- Keep U3/L1 buck regulator switch node and inductor away from U1 antenna region.
- Maintain solid ground under the module body where allowed by the module datasheet.
- Do not change the module antenna or add metal/plastic in direct contact with the antenna without RF validation.
Draft Declaration of Conformity
We, [Company Name], declare that the product USB-C WiFi BLE TH Sensor is designed to conform to applicable FCC Part 15, CE RED, RoHS, and EMC requirements when manufactured and integrated according to the final approved schematic, PCB layout, BOM, RF module integration guide, and user manual.
Authorized signatory: ____________________
Date: ____________________
User Manual Outline
- Product overview and intended indoor consumer use.
- USB-C 5 V power-only input requirements.
- Wireless setup/provisioning instructions.
- Temperature/humidity measurement limitations; avoid direct sunlight, condensation, and heat sources.
- Regulatory notices: FCC Part 15 statements, CE/UKCA marking, RF exposure statement, no user-serviceable RF modifications.
- Disposal and RoHS/WEEE notes.
Open Items
- Confirm exact SiWG917 certification IDs and approved integration conditions.
- Add final PCB layout screenshots/exports after layout.
- Run EMC pre-scan with USB cable attached and Wi-Fi/BLE active.
Status
Applicable Regulations
Product Description
Wireless Technology Summary
Required Documentation Checklist
RF Design Notes
Draft Declaration of Conformity
User Manual Outline
Open Items
