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Maxic Optical Tracking Sensors: Empowering Precision Control in Smartphone Image Zoom

  • Release Date2026-01-12

  • Page View49 times

On December 25, a highly anticipated imaging flagship series smartphone was officially released as scheduled. Centered on imaging performance, the new product delivers a comprehensive upgrade, featuring a professional-grade, high-resolution continuous optical zoom lens paired with a new-generation flagship processor, bringing a completely refreshed user experience.

Its milestone significance lies in its 'dual-core' technological approach to replicating the essence of professional cameras.

Design: It pioneers a fusion of classic professional imaging design language and iconic branding craftsmanship, redefining the premium aesthetic of smartphones.


The “Master Zoom Ring” is equipped with Maxic’s highly integrated optical tracking sensor MT3502, enabling precise rotational detection. Based on laser navigation technology, the sensor captures continuous surface images via laser reflection and utilizes built-in algorithms to determine movement, achieving real-time, micro-distance, high-precision and ultra-low-power rotation angle detection on stainless steel surfaces, with a resolution accuracy of up to 0.1°.

During rotation of the zoom ring, the sensor continuously monitors angular changes. The smartphone system parses the output signals to accurately resolve rotation direction, speed, and angle, thereby enabling smooth, precise, and lightning-fast zoom and parameter control.

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Maxic MT3502 is the industry’s first high-performance, ultra-low-power optical tracking sensor that integrates both rotational and key detection. It incorporates an 850 nm VCSEL emitter, an infrared receiver array, a high-precision ADC, and a high-speed digital image processing module. Featuring an integrated transceiver, high integration, high precision, ultra-low power consumption, convenient production testing, and rich functionality, it is primarily used for rotary and press detection in devices such as smartphones, smartwatches, and smart glasses.

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Features：

  • Industry’s first chip integrating both rotational detection and key detection

  • Compact OLGA package: 3.5 mm × 3.2 mm × 0.65 mm, with integrated 850 nm VCSEL

  • 24x24 extra-large pixel sensing area, wide depth of field, detection height range from 0.5 mm to 30 mm

  • Resolution up to 5000 CPI (STS stainless-steel surface); supports crown rotation speeds up to 900 RPM

  • Ultra-low-power design: typical current of 550 μA in active mode, 5 μA in sleep mode, and 1.5 μA in standby mode

  • Built-in OTP, supporting CPI calibration, with calibration accuracy of 0.625%

  • Supports 1 MHz I2C communication with SDA/SCL swap capability, allowing dual devices on the same bus

  • Supports 2-wire SPI interface

  • Supports GPIO key interrupt detection

  • Integrated VCSEL fault detection function

Maxic will continue to strive for excellence, constantly optimizing, upgrading, and innovating our products to provide customers with even more satisfactory and high-value solutions.