STMPE1208SQTR

Product Overview

• Category: Integrated Circuit (IC)
• Use: GPIO Expander
• Characteristics: High-performance, low-power, 8-bit I/O expander with interrupt output
• Package: 24-pin QFN package
• Essence: Expands the number of general-purpose input/output (GPIO) pins available to a microcontroller or other digital system
• Packaging/Quantity: Tape and reel packaging, 2500 units per reel

Specifications

• Supply Voltage: 1.65V to 3.6V
• Number of I/O Pins: 8
• I/O Voltage Levels: 1.8V to VDD
• Interrupt Output: Open-drain output, active-low
• Operating Temperature Range: -40°C to +85°C

Pin Configuration

The STMPE1208SQTR has a total of 24 pins. The pin configuration is as follows:

1. GND: Ground
2. VDD: Supply voltage
3. SDA: Serial data input/output for I2C communication
4. SCL: Serial clock input for I2C communication
5. IRQ: Interrupt output
6. GP0-GP7: General-purpose I/O pins

Functional Features

• Provides additional GPIO pins for microcontrollers with limited I/O capabilities
• Supports I2C communication protocol for easy integration into existing systems
• Interrupt output allows efficient handling of input changes without continuous polling
• Low power consumption for energy-efficient applications
• High-performance operation for fast and reliable data transfer

Advantages and Disadvantages

Advantages: - Increases the number of available GPIO pins, enabling more complex digital systems - Easy integration with existing systems using the I2C communication protocol - Efficient interrupt handling reduces the need for continuous polling - Low power consumption helps prolong battery life in portable devices

Disadvantages: - Limited to 8 I/O pins, may not be sufficient for applications requiring a large number of GPIOs - Requires I2C interface support from the microcontroller or digital system

Working Principles

The STMPE1208SQTR operates as an I/O expander by communicating with a microcontroller or digital system through the I2C protocol. It expands the available GPIO pins by providing 8 additional I/O pins. The device can be configured and controlled using I2C commands, allowing the microcontroller to read input states and set output states.

When an input state changes on any of the GPIO pins, the STMPE1208SQTR generates an interrupt signal (IRQ) to notify the microcontroller. This allows the microcontroller to respond promptly to input changes without continuously polling the device.

Application Field Plans

The STMPE1208SQTR can be used in various applications that require additional GPIO pins, such as:

1. Embedded systems: Expand the I/O capabilities of microcontrollers in embedded systems, enabling connection to multiple sensors, actuators, and peripherals.
2. Industrial automation: Provide additional I/O pins for controlling and monitoring industrial equipment, facilitating process automation and data acquisition.
3. Internet of Things (IoT): Enhance IoT devices by increasing the number of available GPIOs for sensor inputs, control outputs, and communication interfaces.
4. Consumer electronics: Enable more complex user interfaces and connectivity options in devices like smart home appliances, wearables, and gaming consoles.

Alternative Models

• STMPE2401: 24-pin I/O expander with 16 I/O pins and interrupt output
• MCP23017: 28-pin I/O expander with 16 I/O pins, interrupt output, and higher voltage range support
• PCA9538: 16-pin I/O expander with 8 I/O pins and interrupt output

These alternative models offer similar functionality to the STMPE1208SQTR and can be considered based on specific requirements and system compatibility.

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