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)