Part Review and Datasheet Update

flux

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
Sign up to send

Files

Pins

Symbol

Layout

3D View

Name
Pin #
Type
Section
Pin Group
Orientation
Order
GND_1
1
Unspecified
GND_2
2
Unspecified
GND_3
3
Unspecified
IRQN
4
Unspecified
SCL
5
Unspecified
GND_4
6
Unspecified
VDD
7
Unspecified
SDA
8
Unspecified
ADDR
9
Unspecified
GND_5
10
Unspecified
GND_6
11
Unspecified
RESERVED._DO_NOT_CONNECT_1
12
Unspecified
RESERVED._DO_NOT_CONNECT_2
13
Unspecified
RESERVED._DO_NOT_CONNECT_3
14
Unspecified
RESERVED._DO_NOT_CONNECT_4
15
Unspecified
RESERVED._DO_NOT_CONNECT_5
16
Unspecified
EP_1
17
Unspecified
EP_2
18
Unspecified

SDP31-500Pa