QT113A-ISG

Product Overview

• Category: Integrated Circuit (IC)
• Use: Capacitive touch sensor
• Characteristics: High sensitivity, low power consumption
• Package: SOP-8 (Small Outline Package)
• Essence: Touch sensing IC
• Packaging/Quantity: Tape and reel, 2500 units per reel

Specifications

• Operating Voltage: 2.5V to 5.5V
• Operating Current: 1.5μA (typical)
• Sensitivity Range: Adjustable from 1pF to 50pF
• Response Time: 60ms (typical)
• Operating Temperature: -40°C to +85°C

Detailed Pin Configuration

The QT113A-ISG has a total of 8 pins arranged as follows:

┌───┬───┐ │ 1 │ 2 │ ├───┼───┤ │ 3 │ 4 │ ├───┼───┤ │ 5 │ 6 │ ├───┼───┤ │ 7 │ 8 │ └───┴───┘

1. VDD: Power supply voltage input
2. GND: Ground reference
3. SNS: Capacitive touch sensing input
4. OUT: Digital output indicating touch detection
5. NC: Not connected
6. NC: Not connected
7. NC: Not connected
8. NC: Not connected

Functional Features

• Capacitive touch sensing with adjustable sensitivity
• Built-in noise filtering for reliable touch detection
• Low power consumption for battery-powered applications
• Simple two-wire interface for easy integration
• Automatic recalibration to compensate for environmental changes

Advantages and Disadvantages

Advantages

• High sensitivity allows for touch detection through various materials
• Low power consumption extends battery life in portable devices
• Adjustable sensitivity range provides flexibility for different applications
• Noise filtering enhances reliability of touch detection
• Easy integration with a simple two-wire interface

Disadvantages

• Limited number of touch sensing inputs (only one in this case)
• Requires external components for proper operation (e.g., capacitive touch pad)

Working Principles

The QT113A-ISG operates based on the principle of capacitive sensing. It detects changes in capacitance caused by the proximity or touch of an object to the touch sensing input pin (SNS). When a touch is detected, the digital output pin (OUT) goes high, indicating the presence of a touch event.

The IC uses an internal oscillator to generate an AC signal that is applied to the touch sensing electrode. The change in capacitance caused by a touch alters the frequency of the oscillator, which is then detected and processed by the IC. The sensitivity of the touch detection can be adjusted using external components connected to the SNS pin.

Detailed Application Field Plans

The QT113A-ISG is widely used in various applications that require touch sensing capabilities. Some of the common application fields include:

1. Consumer Electronics:

   • Touch-sensitive buttons and sliders on remote controls
   • Capacitive touch panels for smartphones and tablets
   • Proximity detection for automatic display activation

2. Home Appliances:

   • Touch-sensitive control panels for ovens, microwaves, and refrigerators
   • Proximity detection for automatic faucet activation

3. Automotive:

   • Capacitive touch buttons and sliders for infotainment systems
   • Proximity detection for automatic door handles and keyless entry systems

4. Industrial Controls:

   • Touch-sensitive control panels for machinery and equipment
   • Proximity detection for safety switches and sensors

Detailed and Complete Alternative Models

• QT1106-ISG: 6-channel capacitive touch sensor IC with adjustable sensitivity
• QT114A-ISG: Single-channel capacitive touch sensor IC with higher sensitivity range
• QT222-ISG: Dual-channel capacitive touch sensor IC with integrated LED driver
• QT60168-ISG: 16-channel capacitive touch sensor IC with advanced noise filtering

These alternative models offer different features and capabilities to suit specific application requirements.

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