Review all available part information (MPN, packag...

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Review all available part information (MPN, package, pin count, description, properties). If no datasheet URL is already set, search the web for the official datasheet and update the part's Datasheet property with the URL. Then cross-check the schematic symbol, footprint, and pin descriptions against the datasheet. Summarize key specs and flag any mismatches.

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PAT9125EL-TKIT Part Datasheet Audit
What I checked
Datasheet URL update
The part already has a Datasheet URL in project context; I verified it points to the PixArt PAT9125EL-TKIT/TKMT datasheet PDF. I also set/confirmed the project-level Datasheet URL property to:
https://www.epsglobal.com/Media-Library/EPSGlobal/Products/files/pixart/PAT9125EL-TKITPAT9125EL-TKMT.pdf?ext=.pdf
Datasheet-derived part information

Table

FieldDatasheet value
ManufacturerPixArt Imaging Inc.
MPN reviewedPAT9125EL-TKIT
DescriptionOptical Tracking Miniature Chip
Interface variantI2C for PAT9125EL-TKIT; 3-wire SPI for PAT9125EL-TKMT
PackageLGA 8-pin
Package size3.5 x 3.2 x 1.0 mm
Light source850 nm VCSEL laser
ResolutionProgrammable up to ~1,275 cpi on flat stainless steel surface
DOF / distance to surface1 to 30 mm on STS surface
VDD operating ranges2.1–3.6 V high-voltage segment, or 1.7–1.9 V low-voltage segment
VLD operating range2.7–3.6 V for laser power
Operating temperature-20°C to +60°C
SCL speedUp to 1 MHz for I2C interface
Datasheet pin table vs current schematic terminals
The datasheet lists 8 normal LGA pins plus a back-side TEST pin that is NC / do-not-connect.

Table

PinDatasheet I2C nameDatasheet typeDatasheet functionCurrent terminalCurrent pin typeStatus
1VLDPWRVCSEL laser anode, 2.7–3.3 V in pin table / 2.7–3.6 V in recommended conditionsVLDPower InOK
2VDDAPWR1.8 V regulator output in high-voltage mode; connect 4.7 uF to GND. In low-voltage mode, connect to VDD directlyVDDAPower InPin exists; pin type is debatable because datasheet describes VDDA as regulator output in high-voltage mode
3VDDPWRMain IC power supplyVDDPower InOK
4VSSGNDChip groundVSSPower OutMISMATCH: should be Ground
5SCLINI2C clock inputSCLInputOK
6SDAI/OI2C bidirectional dataSDABi-DirectionalOK
7MOTIONOUTMotion detection output, active lowMOTIONOutputOK
8ID_SELINI2C slave ID select: High=0x73, Low=0x75, NC=0x79ID_SELInputOK
9TESTNCBack-side PixArt test pin; do not connect to any PCB partNo terminalMissing if Flux should model every datasheet-listed pin; may be intentionally omitted if the footprint has no connectable pad
Current schematic symbol audit
Current schematic terminals found:
  • VLD, pin 1, Power In
  • VDDA, pin 2, Power In
  • VDD, pin 3, Power In
  • VSS, pin 4, Power Out
  • SCL, pin 5, Input
  • SDA, pin 6, Bi-Directional
  • MOTION, pin 7, Output
  • ID_SEL, pin 8, Input
Issues:
  1. VSS is typed as Power Out, but the datasheet defines pin 4 as GND / Chip ground; this should be Ground.
  2. No terminal exists for datasheet pin 9 TEST, which the datasheet says is on the back of the chip and must not be connected. Whether this should be represented depends on whether the Flux part should include non-connectable back-side/test pads.
  3. Terminals are missing parametric symbol metadata: Pin Group, Pin Orientation, and Section for all eight existing terminals.
  4. Pin descriptions are not populated on the terminals.
Project metadata audit
Current indexed project properties found:

Table

PropertyCurrent valueDatasheet check
Manufacturer Part NumberPAT9125EL-TKITOK
Datasheet URLEPS Global hosted PixArt PDFOK / set
Designator PrefixUOK for IC/sensor package
Manufacturer NameMissingShould be PixArt Imaging Inc.
Part TypeMissingShould be Sensor / Optical Tracking Sensor
Package or Case CodeMissingShould be LGA 8-pin, 3.5 x 3.2 x 1.0 mm
DescriptionBlank / not indexedShould describe optical tracking miniature chip with I2C, VCSEL, LGA8
Review checks also flagged missing Manufacturer Name and Part Type, and informational warnings that each terminal lacks Pin Group, Pin Orientation, and Section.
Footprint audit
Available footprint asset:
  • LGA8_3P2X3P5_PIX-M.kicad_mod
  • Label: PAT9125EL-TKIT
  • Marked as a footprint asset
PCB layout pad objects exist for VLD, VDDA, VDD, VSS, SCL, SDA, MOTION, and ID_SEL. This aligns with the 8-pin LGA package and the footprint filename suggests 3.2 x 3.5 mm LGA8. I could not extract exact pad geometry from the imported footprint object through the current layout data; the datasheet mechanical page gives 3.50 ±0.1 mm x 3.20 ±0.1 mm body and 1.00 ±0.1 mm height, with bottom-view pad dimensions shown in the package outline.
Key mismatches / action items
  1. Fix VSS terminal Pin Type: Power Out → Ground.
  2. Add missing project metadata:
    • Manufacturer Name: PixArt Imaging Inc.
    • Part Type: Sensor or Optical Tracking Sensor
    • Package or Case Code: LGA 8-pin / 3.5 x 3.2 x 1.0 mm
  3. Add terminal metadata:
    • Section: Power for VLD/VDDA/VDD; Ground for VSS; Communication for SCL/SDA; Control for ID_SEL; Signal/Interrupt for MOTION.
    • Pin Group: Power, Ground, I2C, Control, Interrupt.
    • Pin Orientation: Top for power, Bottom for VSS, Left for SCL/SDA/ID_SEL, Right for MOTION.
  4. Add concise pin descriptions for all terminals.
  5. Decide whether to model datasheet pin 9 TEST as a Not Connected terminal/no-connect pin, or leave it omitted because it is a back-side factory test pin that must not connect to the PCB.

  • What I checked

  • Datasheet URL update

  • Datasheet-derived part information

  • Datasheet pin table vs current schematic terminals

  • Current schematic symbol audit

  • Project metadata audit

  • Footprint audit

  • Key mismatches / action items

Documents

  • PAT9125EL-TKIT Part Datasheet Audit

Assets

kicad_mod

PAT9125EL-TKIT

LGA8_3P2X3P5_PIX-M.kicad_modFootprint
PAT9125EL-TKIT-thumb.png

PAT9125EL-TKIT-thumb.png

PAT9125EL-TKIT-thumbThumbnail

PAT9125EL-TKIT

PAT9125EL-TKIT thumbnail
The PAT9125EL-TKIT from PixArt Imaging Inc. is a low-power optical tracking miniature chip designed for precise motion detection using laser-based optical navigation technology. It integrates both the optical sensor and VCSEL laser light source into a single compact package, enabling accurate tracking even on smooth or glossy surfaces.
This device captures sequential surface images and processes them internally to determine movement direction, speed, and displacement (X/Y data), which can be accessed by a host controller via digital interfaces.
It is particularly suited for space-constrained, battery-powered, and enclosed systems, eliminating the need for mechanical components like code wheels or special surface markings.
Key Features Integrated optical sensor + VCSEL laser (850 nm) in a single package No external lens required, simplifying design Wide depth of field (DOF): 1–30 mm, even on reflective surfaces Programmable resolution up to ~1275 CPI Supports I²C (TKIT) interface (SPI variant available as TKMT) Motion detection interrupt output Built-in oscillator (no external clock needed) Low power consumption: Run: ~0.7 mA Sleep: down to 10 µA Power-down: ~5 µA Pre-calibrated laser (no calibration required) IEC/EN 60825-1 Class 1 eye-safe laser compliant Key Specifications Supply Voltage: VDD: 1.7–3.6 V VLD (laser): 2.7–3.6 V Max Tracking Speed: up to ~30 inches/sec Package: 8-pin LGA (3.5 × 3.2 × 1.0 mm) Interface: I²C (for TKIT variant)

Properties

PAT9125EL-TKIT

PixArt

Sensor

epsglobal.com/Media-Library/EPSGlobal/Products/files/pixart/PAT9125EL-TKITPAT9125EL-TKMT.pdf?ext=.pdf

U

parametric-v1

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