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Gesture Sensor for Automotive Applications

Automotive Low Cost IR Based Gesture Sensor

Product Details

The MAX25205 is a low-cost data-acquisition system for gesture and proximity sensing. The MAX25205 recognizes the following independent gestures:

  • Hand swipe gestures (left, right, up, and down)
  • Finger and hand rotation (CW and CCW)
  • Proximity detection

The proximity, hand detection, and gesture recognition functions of the MAX25205 operate by detecting the light reflected from the controlled IR-LED light source with an integrated 6x10-element optical sensor array. The MAX25205 can detect these gestures even when exposed to bright ambient light. A low-power, low-cost CPU, such as the MAX32630, is required to process the data from the sensor.

This discrete light source is created externally with one or more FETs driven directly from the MA25205. The light source’s PWM duty cycle is programmable from 1/16 to 16/16. The LEDs are pulsed on one or more times in a programmable sequence that is repeated for every sample.

For flexibility, the MAX25205 supports two different serial communication protocols: I2C (400kHz) and SPI (6MHz).

The MAX25205 is available in a 4mm x 4mm, 20-pin, optical QFN package.

Key Features

  • Low-Cost, Flexible Gesture-Sensing Solution for Automotive Applications
  • Low-Power, Low-Cost External CPU Processes Sensor Output
  • Supports Swipe, Rotation, and Proximity Gestures
  • Highly Integrated
    • 60-Pixel IR Photodiode Array
    • Integrated LED Driver
    • 400kHz I2C and 6MHz SPI Serial Interfaces
  • Operates in 120k Lux Ambient Light
  • AEC-Q100 Qualified
    • -40°C to +85° C Operation
    • MSL3
  • Ultra-Low-Power Operation:
    • 1mA at 3.3V
  • Compact 4mm x 4mm x 1.35mm, 20-Pin, Side-Wettable QFN Package

Applications/Uses

  • Central Information Display Control
  • Door, Moon Roof, and Trunk Control
  • Mechanical Switch Replacement
  • Occupant Detection
  • Rear-Seat Entertainment Systems
Parametric specs for Gesture Sensors
Integrated LEDs 0
ISUPPLY (µA) (typ) 1000
Shutdown Mode Supply Current (µA) (typ) 1
VSUPPLY (V) (min) 3
VSUPPLY (V) (max) 3.6
Resolution (bits) (ADC) 12
SNR (dB) 80
Oper. Temp. (°C) -40 to +105
Package/Pins QFN/20
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Technical Docs

Design & Development

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Description

The MAX25205 evaluation kit (EV kit) is a complete system for demonstrating the MAX25205 optical IR sensor in a typical gesture and proximity-sensing application.

The MAX25205 enables recognition of the following gestures:

  • Hand Swipe Left, Right, Up, and Down
  • Finger/Hand Rotation Clockwise and Counterclockwise
  • Air Click
  • Proximity Detection and Linger-to-Click

The application circuit operates by illuminating the user’s hand with a precision-controlled IR light source and measuring the reflected signal with the MAX25205’s 6x10 (60 pixel) IR sensor array. The four-LED IR light source is PWM controlled with external FETs from the MAX25205’s onboard FET driver. The return signal is analyzed with an embedded microcontroller that interprets the gestures.

The EV Kit consists of the following:

  • MAX32620FTHR Microcontroller Platform
  • Interface Shield Board
  • MAX25205 Sensor Board
  • Ribbon Cable (Connects Sensor Board to Shield Board)
  • 3.3V Power Supply
  • USB 2.0 Type A to Micro B Cable

View Details

Features

  • Simple yet Flexible Gesture Solution
  • Lower Solution Cost than Camera-Based Systems
  • Integrated Optics with ±20deg FOV
  • Optimum Resolution for Dynamic Hand Gestures
  • Built-in LED Driver with Ultra-Low-Power Operation
  • 120kLux Ambient Light Performance
  • Compact 20-pin, 4mm x 4mm QFN Package, Side-Wettable
  • AEC-Q100
  • -40°C to +85°C Operation

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Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal.

Parameters

Parametric specs for Gesture Sensors
Integrated LEDs 0
ISUPPLY (µA) (typ) 1000
Shutdown Mode Supply Current (µA) (typ) 1
VSUPPLY (V) (min) 3
VSUPPLY (V) (max) 3.6
Resolution (bits) (ADC) 12
SNR (dB) 80
Oper. Temp. (°C) -40 to +105
Package/Pins QFN/20

Key Features

  • Low-Cost, Flexible Gesture-Sensing Solution for Automotive Applications
  • Low-Power, Low-Cost External CPU Processes Sensor Output
  • Supports Swipe, Rotation, and Proximity Gestures
  • Highly Integrated
    • 60-Pixel IR Photodiode Array
    • Integrated LED Driver
    • 400kHz I2C and 6MHz SPI Serial Interfaces
  • Operates in 120k Lux Ambient Light
  • AEC-Q100 Qualified
    • -40°C to +85° C Operation
    • MSL3
  • Ultra-Low-Power Operation:
    • 1mA at 3.3V
  • Compact 4mm x 4mm x 1.35mm, 20-Pin, Side-Wettable QFN Package

Applications/Uses

  • Central Information Display Control
  • Door, Moon Roof, and Trunk Control
  • Mechanical Switch Replacement
  • Occupant Detection
  • Rear-Seat Entertainment Systems

Description

The MAX25205 is a low-cost data-acquisition system for gesture and proximity sensing. The MAX25205 recognizes the following independent gestures:

  • Hand swipe gestures (left, right, up, and down)
  • Finger and hand rotation (CW and CCW)
  • Proximity detection

The proximity, hand detection, and gesture recognition functions of the MAX25205 operate by detecting the light reflected from the controlled IR-LED light source with an integrated 6x10-element optical sensor array. The MAX25205 can detect these gestures even when exposed to bright ambient light. A low-power, low-cost CPU, such as the MAX32630, is required to process the data from the sensor.

This discrete light source is created externally with one or more FETs driven directly from the MA25205. The light source’s PWM duty cycle is programmable from 1/16 to 16/16. The LEDs are pulsed on one or more times in a programmable sequence that is repeated for every sample.

For flexibility, the MAX25205 supports two different serial communication protocols: I2C (400kHz) and SPI (6MHz).

The MAX25205 is available in a 4mm x 4mm, 20-pin, optical QFN package.

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal.