AT42QT1110-AUR

Product Overview

• Category: Integrated Circuit (IC)
• Use: Capacitive Touch Sensor
• Characteristics: High sensitivity, low power consumption, compact size
• Package: 20-pin QFN (Quad Flat No-Lead)
• Essence: The AT42QT1110-AUR is a capacitive touch sensor IC designed for various touch-sensitive applications.
• Packaging/Quantity: Available in reels of 2500 units

Specifications

• Operating Voltage: 1.8V - 5.5V
• Number of Channels: 11
• Sensitivity Range: Adjustable from 12 pF to 60 pF
• Output Type: Digital (I2C interface)
• Power Consumption: Low power mode available (< 1 µA)
• Operating Temperature Range: -40°C to +85°C

Pin Configuration

The AT42QT1110-AUR has a total of 20 pins. Here is the detailed pin configuration:

1. VDD - Power Supply
2. GND - Ground
3. SDA - I2C Serial Data
4. SCL - I2C Serial Clock
5. IRQ - Interrupt Request Output
6. CH0 - Channel 0 Input
7. CH1 - Channel 1 Input
8. CH2 - Channel 2 Input
9. CH3 - Channel 3 Input
10. CH4 - Channel 4 Input
11. CH5 - Channel 5 Input
12. CH6 - Channel 6 Input
13. CH7 - Channel 7 Input
14. CH8 - Channel 8 Input
15. CH9 - Channel 9 Input
16. CH10 - Channel 10 Input
17. VSS - Ground
18. VDD - Power Supply
19. NC - No Connection
20. NC - No Connection

Functional Features

• Capacitive touch sensing with 11 channels
• Adjustable sensitivity for different touch inputs
• I2C interface for easy integration with microcontrollers
• Interrupt output for touch detection events
• Low power consumption for battery-powered applications
• Robust noise immunity for reliable touch detection
• Automatic recalibration to compensate for environmental changes

Advantages and Disadvantages

Advantages: - High sensitivity allows for accurate touch detection - Low power consumption extends battery life - Compact size enables integration in space-constrained designs - Easy integration with microcontrollers through I2C interface - Robust noise immunity ensures reliable operation

Disadvantages: - Limited number of channels (11) may not be sufficient for complex touch applications - Requires external components for proper functioning (e.g., capacitors, resistors)

Working Principles

The AT42QT1110-AUR utilizes capacitive sensing technology to detect touch inputs. It measures the change in capacitance when a conductive object, such as a finger, approaches or touches the sensor. This change is converted into a digital signal and can be used to trigger various actions or functions.

The IC employs a self-calibration mechanism to compensate for environmental changes, ensuring consistent performance over time. It also incorporates noise filtering techniques to minimize false touch detections caused by external interference.

Application Field Plans

The AT42QT1110-AUR is suitable for a wide range of touch-sensitive applications, including but not limited to:

1. Consumer Electronics:

   • Mobile phones and tablets
   • Remote controls
   • Gaming consoles

2. Home Automation:

   • Light switches
   • Thermostats
   • Security systems

3. Automotive:

   • Touchscreen infotainment systems
   • Steering wheel controls
   • Climate control panels

4. Industrial Control:

   • Human-machine interfaces (HMIs)
   • Control panels
   • Keypads

Alternative Models

If the AT42QT1110-AUR does not meet specific requirements, alternative models with similar functionality include:

1. AT42QT2120-AUR: 12-channel capacitive touch sensor IC with extended temperature range.
2. AT42QT2160-AUR: 16-channel capacitive touch sensor IC with higher sensitivity and additional features.
3. AT42QT2180-AUR: 18-channel capacitive touch sensor IC with enhanced noise immunity and advanced calibration options.

These alternative models offer flexibility in terms of channel count, sensitivity, and additional features, allowing designers to choose the most suitable option for their application.

In conclusion, the AT42QT1110-AUR is a versatile capacitive touch sensor IC that offers high sensitivity, low power consumption, and compact size. Its numerous applications, along with alternative models, make it a popular choice for touch-sensitive designs.

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