Part Review and Datasheet Update

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I reviewed the part project against the datasheet URL already present in the project properties, so I did not search the web or change the Datasheet property.
Part metadata review Project properties vs datasheet

Table

ItemIn projectDatasheet checkStatus
ManufacturerSensirionSensirionMatch
MPNSDP31-500PaSDP31 / ordering variant for 500 Pa differential rangeMatch
DescriptionPressure sensor, 500 Pa, 3.3 VDifferential pressure sensor, -500 Pa to +500 Pa, 3.0 V to 4.0 V supply, 3.3 V typMostly match
Datasheet URLPresentValid PDFMatch
Part typeSensorsPressure sensorMatch
Key specs from datasheet SDP31 key specifications

Table

ParameterDatasheet value
Pressure range-500 Pa to +500 Pa
Supply voltage3.0 V min, 3.3 V typ, 4.0 V max
InterfaceI2C
I2C clock400 kHz to 1 MHz
Resolution16 bit
Zero point accuracy0.1 Pa
Zero point repeatability0.03 Pa
Span accuracy3% of reading
Span repeatability0.5% of reading
MediaAir, N2, O2, non-condensing
Package styleQFN Quad 2 configuration with top pneumatic cap
Electrical pins16
Exposed pad1 center die pad, internally connected to GND
Symbol cross-check Symbol pins vs datasheet

Table

Datasheet expectationIn projectStatus
Pins 1, 2, 3, 6, 10, 11 = GNDPresent as separate GND terminalsMatch
Pin 4 = IRQnPresentMatch
Pin 5 = SCLPresentMatch
Pin 7 = VDDPresentMatch
Pin 8 = SDAPresentMatch
Pin 9 = ADDRPresentMatch
Pins 12-16 = Reserved / Do Not ConnectPresent as reserved DNC terminalsMatch
Center pad = exposed pad / die pad to GNDPresent as two terminals: EP_1 and EP_2Mismatch / needs review
Footprint cross-check Footprint observations

Table

Datasheet expectationIn layoutStatus
16 perimeter padsPresent by named pads matching pins 1-16Match
1 exposed center padFootprint appears to have 2 exposed-pad terminals in schematic plus 3 extra mount pads numbered 19, 20, 21 in layoutMismatch / suspicious
QFN package with exposed padFootprint exists, but package property is not explicitly populated in BOM outputIncomplete metadata
Pin description review Pin semantics
| Pin/function | Datasheet guidance | Project state | Status | |---|---|---| | GND pins | Ground | Correctly named | Match | | IRQn | Active-low interrupt output, may be left floating if unused | Correctly named | Match | | SCL/SDA | I2C clock/data | Correctly named | Match | | ADDR | Address-select input; must not connect to VDD | Correctly named | Match | | Reserved pins 12-16 | Do not connect | Correctly marked | Match | | Exposed pad | Internally GND; recommended to solder for mechanical stability | Split into two EP terminals | Mismatch |
Issues flagged
  • Exposed pad definition does not match the datasheet.
    • Datasheet indicates one center die pad.
    • The symbol has EP_1 and EP_2 as separate terminals.
    • The layout also shows extra unnamed/mechanical-looking mount pads 19, 20, 21, which do not correspond to the datasheet electrical pinout.
  • Package metadata looks incomplete.
    • BOM output does not show a populated package code/name for the part project.
    • Datasheet package should be recorded as a QFN-type package with exposed pad and pneumatic cap.
  • Terminal pin types are all "Unspecified".
    • Not electrically wrong, but for a clean part definition it would be better to classify:
      • VDD as power input
      • GND pins as power/ground
      • SDA as bidirectional
      • SCL/ADDR as input
      • IRQn as output
      • Reserved pins as passive or NC-style documentation terminals
Overall assessment
  • Part metadata: mostly correct
  • Symbol pinout: mostly correct
  • Pin naming/descriptions: mostly correct
  • Footprint/exposed pad modeling: likely incorrect
  • Biggest concern: the part should almost certainly have 16 pins + 1 exposed pad, not 16 pins + 2 EP terminals + extra pads 19/20/21
If you want, I can next help you:
  • clean up the part metadata,
  • normalize the terminal types/descriptions,
  • or build a precise fix list for the symbol/footprint mismatch.
Fix symbol mismatch
Normalize pin metadata
Set package details
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SDP31-500Pa

SDP31-500Pa thumbnail
Pressure Sensor -0.07PSI ~ 0.07PSI (-0.5kPa ~ 0.5kPa) Differential Male - 0.08" (2.00mm) Tube, Dual 16b 16-SMD Module, Dual Top Ports The SDP31-500PA belongs to the SDP3x series and uses Sensirion’s CMOSens® technology to deliver accurate and stable pressure measurements. It is optimized for applications where small size, fast response, and high accuracy are critical. This sensor measures bidirectional differential pressure up to ±500 Pa, making it suitable for airflow and gas flow monitoring systems. It provides a fully calibrated, temperature-compensated digital output via I²C, simplifying integration with microcontrollers. Pressure type: Differential (±500 Pa range) High accuracy: حوالي ±3% of measured value Digital output: I²C interface with 16-bit resolution Fast response time: suitable for real-time measurements No zero-point drift: ensures long-term stability Compact size: ~8.5 × 5.5 × 5.15 mm Low voltage operation: typically 3.0–3.6 V Temperature compensated: reliable from −40°C to +85°C #CommonPartsLibrary #Sensor #SDP3x

Properties

SDP31-500Pa

Sensirion

Sensors

sensirion.com/media/documents/4D045D69/6375F34F/DP_DS_SDP3x_digital_D1.pdf

U

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