MPR181EJR2

Product Overview

Category: Electronic Component
Use: Input Device
Characteristics: High Sensitivity, Low Power Consumption
Package: SMD (Surface Mount Device)
Essence: Capacitive Touch Sensor
Packaging/Quantity: Tape and Reel / 3000 pieces per reel

Specifications

• Operating Voltage: 1.8V - 3.6V
• Operating Temperature Range: -40°C to +85°C
• Capacitance Range: 5 pF - 50 pF
• Response Time: <10 ms
• Interface: I2C (Inter-Integrated Circuit)
• Dimensions: 3 mm x 3 mm x 0.65 mm

Detailed Pin Configuration

The MPR181EJR2 has a total of 8 pins arranged as follows:

1. VDD: Power Supply Voltage
2. GND: Ground
3. SDA: Serial Data Line (I2C)
4. SCL: Serial Clock Line (I2C)
5. IRQ: Interrupt Request Output
6. CH0: Channel 0 Capacitive Sense Input
7. CH1: Channel 1 Capacitive Sense Input
8. CH2: Channel 2 Capacitive Sense Input

Functional Features

• Multi-channel capacitive touch sensing
• Proximity detection capability
• Configurable sensitivity levels
• Low power consumption
• Noise filtering and hysteresis options
• Interrupt-driven operation for efficient processing

Advantages and Disadvantages

Advantages: - High sensitivity enables accurate touch detection - Low power consumption prolongs battery life in portable devices - Proximity detection adds versatility to user interfaces - Configurable sensitivity levels allow customization for different applications - Interrupt-driven operation reduces processor load

Disadvantages: - Limited number of touch channels (3 in this case) - Requires I2C interface support from the microcontroller

Working Principles

The MPR181EJR2 utilizes capacitive sensing technology to detect touch and proximity. It measures changes in capacitance caused by the presence or absence of conductive objects, such as a finger. When a touch is detected, the corresponding channel's output changes, triggering an interrupt signal. The device communicates with the microcontroller through the I2C interface, providing touch status and control information.

Detailed Application Field Plans

The MPR181EJR2 can be used in various applications, including but not limited to:

1. Consumer Electronics:

   • Mobile phones
   • Tablets
   • Wearable devices

2. Home Appliances:

   • Touch-sensitive control panels for ovens, refrigerators, etc.

3. Automotive:

   • Infotainment systems
   • Climate control interfaces

4. Industrial Equipment:

   • Human-machine interfaces
   • Control panels for machinery

Detailed and Complete Alternative Models

1. MPR121EQR2: 12-channel capacitive touch sensor with I2C interface.
2. MPR211BQR2: 11-channel capacitive touch sensor with I2C interface.
3. AT42QT1010-TSHR: Single-channel capacitive touch sensor with digital output.

These alternative models offer different channel configurations and features, allowing flexibility in design based on specific requirements.

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