Part Review and Datasheet Verification
Worked for 48 sec
Review complete. The Datasheet URL was already set to Sensirion’s official STS4x datasheet, so no update was needed.
I created the detailed report here: Part Review: STS40-CD1B-R3
Open items:
- Package metadata appears inconsistent:
16-DFNshould be corrected to4-DFN/ DFN 1.5 × 1.5 mm. - Pin names/numbers match the datasheet, but pin types are currently unspecified.
- Footprint pad count/names match; verify no copper exists under the sensor except pin pads per Sensirion guidance.
Suggested next steps:
- Fix the package metadata.
- Set SDA/SCL/VDD/VSS pin types and groups.
- Re-run part review checks after cleanup.
Fix the package metadata and pin types/groups, then rerun the part review checks.
Thought for 4 sec
I’ll update the part metadata and terminal properties, then rerun the part review checks to confirm the cleanup.
Thought for 1 min 38 sec
Updated the part cleanup: package metadata is now
4-DFN, and the terminals now use standard pin metadata: SDA = Bi-Directional / I2C, SCL = Input / I2C, VDD = Power In / Power, VSS = Ground / Ground.Open items:
- Part review checks were rerun, but Flux returned no matching part-review check entries in the current review result set.
Suggested next steps:
- Refresh/reopen the part review panel in Flux to confirm the UI reflects the latest commit.
- If the review still shows stale issues, rerun the project review from the UI and I can inspect the new results.
Refresh review and report
Refresh part review
Update review note
Verify footprint geometry
Export part files
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Part Review: STS40-CD1B-R3
Reviewed source
- Project: STS40-CD1B-R3
- Manufacturer: Sensirion
- Manufacturer Part Number: STS40-CD1B-R3
- Existing Datasheet URL property: https://sensirion.com/media/documents/D2D0B4A9/62060AD9/Sensirion_Datasheet_STS4x.pdf
- Datasheet source used for cross-check: Sensirion Datasheet STS4x, Version 3.1, February 2025. Datasheet query also surfaced Sensirion-hosted equivalent URLs under the STS4x datasheet path.
Project metadata reviewed
Table
| Field | Project value | Datasheet / expected value | Result |
|---|---|---|---|
| Manufacturer | Sensirion | Sensirion | Match |
| MPN | STS40-CD1B-R3 | STS40-CD1B-R3 | Match |
| Part type | Sensors | Digital local temperature sensor | Acceptable |
| Package / case | 16-DFN in project metadata; 4-DFN in indexed part data | DFN, 4 pins, 1.5 mm × 1.5 mm | Mismatch / needs cleanup |
| Pin count | Project context: 4 pads | 4 pins: SDA, SCL, VDD, VSS | Match |
| Description | Temperature Sensor Digital, Local -40C ~ 125C 16 b 4-DFN (1.5x1.5) | Digital temperature sensor, -40 °C to +125 °C, 16-bit output, DFN 1.5 × 1.5 mm | Match |
| Datasheet URL | Present | Official Sensirion STS4x datasheet | No update required |
Datasheet key specs
- Sensor type: digital local temperature sensor.
- Supply voltage: 1.08 V min, 3.3 V typical, 3.6 V max.
- Operating temperature: -40 °C to +125 °C.
- Storage temperature: -40 °C to +150 °C.
- Temperature accuracy for STS40: typically ±0.2 °C.
- Resolution: 0.01 °C.
- Repeatability: high 0.04 °C, medium 0.07 °C, low 0.1 °C.
- Response time: t63% ≈ 2 s.
- Long-term drift: typ <0.03 °C/year, max <0.04 °C/year.
- Interface: I²C Fast-mode Plus with CRC checksum.
- I²C address for STS40-CD1B-R3: 0x46.
- Package: DFN, 1.5 mm × 1.5 mm body, approximately 0.55 mm height, 0.8 mm pitch.
- Datasheet land-pattern guidance: 0.5 mm × 0.3 mm pads; central die pad soldering optional; no copper under the sensor except pin pads.
Pin cross-check
Table
| Pin | Project terminal | Project pin type | Datasheet name | Datasheet description | Result |
|---|---|---|---|---|---|
| 1 | SDA | Unspecified | SDA | Serial data, bidirectional | Name/number match; pin type should be bidirectional/I²C data |
| 2 | SCL | Unspecified | SCL | Serial clock, unidirectional input | Name/number match; pin type should be input/I²C clock |
| 3 | VDD | Unspecified | VDD | Supply voltage | Name/number match; pin type should be power input |
| 4 | VSS | Unspecified | VSS | Ground | Name/number match; pin type should be ground/power |
Footprint cross-check
- Indexed footprint asset:
STS40CD1BR3.kicad_mod. - Indexed 3D model asset:
STS40-CD1B-R3.stp. - Project footprint pads found: SDA, SCL, VDD, VSS.
- Footprint pad count matches the four datasheet pins.
- No separate exposed/central die pad was found in the project index. This is acceptable if the intended footprint follows the datasheet note that soldering the central die pad is optional, but the footprint should still avoid copper under the sensor except at pin pads.
Mismatches and cleanup items
- Package metadata mismatch: project properties list
Package or Case Code: 16-DFN, but this part is a 4-pin DFN / 4-DFN, 1.5 mm × 1.5 mm device. This should be changed to avoid search/BOM confusion. - Pin types are unspecified: terminal names and pin numbers match the datasheet, but the symbol pin types should be set more specifically: SDA = bidirectional, SCL = input, VDD = power input, VSS = ground/power.
- Pin groups/sections missing: no explicit pin groups/sections were found. Suggested grouping: I²C Interface (SDA/SCL), Power (VDD), Ground (VSS).
- Land-pattern caution: verify the footprint has no copper under the sensing die except pin pads, consistent with Sensirion's layout recommendation.
Overall result
The part identity, datasheet URL, description, pin count, and terminal-to-footprint pad names are largely correct. The main correction needed is the package metadata typo (
16-DFN should be 4-DFN or equivalent), followed by improving pin type and grouping metadata for cleaner part review results.
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