1. Overview & Purpose

️· Sensor Type: Optical sensor (primarily for tracking movement).
️· Target Applications: Mice, trackpads, scanning systems, and other devices requiring precise motion detection.
️· Key Features: High-resolution tracking, low power consumption, customizable settings via SPI interface, burst mode operation, and various operating modes.
️· Resolution: Capable of resolutions up to 6469 frames per second (fps) depending on the setting.
️· Light Source: Requires an external IR LED (recommendations in the datasheet, such as HLMP-EG3E).

2. Electrical Characteristics

️· Supply Voltage: Operates at 3.3V (VDD3).
️· Current Consumption:
- Average current: 52mA (at 6469 fps, no LED load).
- Power down mode: <90µA.
️· Input/Output Voltage Levels: Standard CMOS levels (0.8V low, VDD3 high).
️· SPI Interface: Supports SPI communication for configuration and data retrieval. Detailed timing diagrams and requirements are provided.
️· Detailed DC and AC Electrical Specifications: Extensive tables outlining voltage levels, current consumption, timing parameters (setup, hold, rise/fall times), input/output capacitance, and more. These are crucial for proper integration.

3. Functional Description & Operating Modes

️· SPI Interface: Used for configuring the sensor, reading data (motion, registers), and controlling various functions. The datasheet details the SPI communication protocol, register map, and command structure.
️· Power Down Mode: Reduces power consumption when the sensor is not in use.
️· Burst Mode: Allows for fast data transfer by sending multiple data frames consecutively.
️· Shutter Modes the sensor utilizes shutter to capture image.

4. Timing Diagrams & Signals

️· NPD (Navigation Power Down): Controls power to the sensor and initiates tracking. The timing of NPD rising edge relative to oscillator startup and data capture is critical.
️· RESET: Used to reset the sensor to its initial state.
️· SPI Timing: Detailed timing diagrams for SPI communication, including setup, hold, and clocking requirements.
️· Detailed signal and timing diagrams.

5. Register Map & Commands

️· Register Map: A comprehensive table that defines the address and function of each register within the sensor.
️· SPI Commands: Specifies the commands used to read and write registers, configure the sensor, and control its operation.

6. Performance Specifications

️· Speed: Capable of tracking up to 60 inches per second (ips).
️· Acceleration: Can handle accelerations up to 20G.
️· Frame Rates: Supports various frame rates, ranging from 2000fps to 6469fps.
️· Light level requirements: provides the recommended light level range.

7. Key Considerations for Integration

️· LED Selection: Choosing the right IR LED (wavelength, intensity) is critical for optimal performance.
️· Power Supply: Providing a stable 3.3V supply is essential.
️· SPI Interface: Properly implementing the SPI interface with correct timing is crucial.
️· Lens Design: The design of the lens and its alignment with the sensor and LED affects tracking accuracy.



In essence, this datasheet provides all the technical information needed to integrate the PixArt PMIC3989 optical sensor into a product. It covers electrical characteristics, functional description, communication protocols, and performance specifications.



Is there anything specific within the document you'd like me to elaborate on? For instance, are you interested in:

️· The SPI interface details?
️· The specific register map?
️· The power consumption characteristics?
️· The LED requirements?