MAX25205
Gesture Sensor for Automotive Applications
Automotive Low Cost IR Based Gesture Sensor
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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
| 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 |
Technical Docs
| Data Sheet | Gesture Sensor for Automotive Applications | Dec 10, 2020 | |
| White Paper | Why Designing ICs from the Ground Up for Automotive Applications Matters |
Click any title below to view the detail page where available.
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
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
Support & Training
Search our knowledge base for answers to your technical questions.
Filtered SearchOur dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal
Parameters
| 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
| Data Sheet | Gesture Sensor for Automotive Applications | Dec 10, 2020 | |
| White Paper | Why Designing ICs from the Ground Up for Automotive Applications Matters |
Support & Training
Search our knowledge base for answers to your technical questions.
Filtered SearchOur dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal
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