PCAL6524EVJ

Product Overview

• Category: Integrated Circuit
• Use: GPIO Expander
• Characteristics: Low-voltage translating I2C-bus/SMBus I/O expander with interrupt and reset
• Package: 24-pin HVQFN package
• Essence: The PCAL6524EVJ is a versatile GPIO expander designed to provide additional general-purpose input/output (GPIO) pins for microcontrollers or other devices.
• Packaging/Quantity: Available in tape and reel packaging, with 250 units per reel.

Specifications

• Supply Voltage: 1.65V to 3.6V
• I/O Voltage: 1.8V to 3.6V
• Number of I/O Pins: 24
• Interrupt Output: Open-drain output
• Operating Temperature Range: -40°C to +85°C
• Interface: I2C-bus/SMBus compatible

Detailed Pin Configuration

The PCAL6524EVJ has a total of 24 pins, each serving a specific purpose. Here is the detailed pin configuration:

1. SDA: Serial Data Input/Output
2. SCL: Serial Clock Input
3. INT: Interrupt Output
4. RESET: Active-Low Reset Input
5. VDD: Supply Voltage
6. GND: Ground 7-24. GPIO0-GPIO17: General-Purpose Input/Output Pins

Functional Features

• Low-voltage level translation between I2C-bus/SMBus and GPIO signals
• Programmable polarity inversion for input pins
• Configurable interrupt output
• Software reset function
• Internal power-on reset
• Noise filtering on inputs
• Schmitt-trigger action on all inputs

Advantages and Disadvantages

Advantages: - Provides additional GPIO pins for devices with limited I/O capabilities - Low-voltage level translation simplifies interfacing between different voltage domains - Configurable interrupt output allows efficient event-driven designs - Noise filtering and Schmitt-trigger action enhance signal integrity

Disadvantages: - Limited to 24 I/O pins, may not be suitable for applications requiring a larger number of GPIOs - Requires I2C-bus/SMBus interface support from the host device

Working Principles

The PCAL6524EVJ operates by translating low-voltage I2C-bus/SMBus signals to corresponding GPIO levels. It acts as an intermediary between the microcontroller or host device and external peripherals. The device can be configured through the I2C-bus/SMBus interface, allowing the user to set pin directions, polarity inversion, interrupt behavior, and other parameters.

Detailed Application Field Plans

The PCAL6524EVJ finds applications in various fields, including but not limited to:

1. Consumer Electronics: Adding extra I/O pins to smart home devices, remote controls, and wearable gadgets.
2. Industrial Automation: Expanding the I/O capabilities of programmable logic controllers (PLCs) and industrial control systems.
3. Automotive: Integrating additional GPIOs for automotive infotainment systems, lighting controls, and sensor interfaces.
4. Internet of Things (IoT): Enabling connectivity and control for IoT devices such as smart sensors, actuators, and edge computing platforms.

Detailed and Complete Alternative Models

1. PCA9538E: 8-bit I2C-bus/SMBus I/O expander with configurable interrupt output.
2. MCP23017: 16-bit I2C-bus I/O expander with interrupt output and cascading capability.
3. MAX7313: 16-bit I2C-bus/SMBus I/O expander with interrupt output and LED driver functionality.

These alternative models offer similar functionality to the PCAL6524EVJ and can be considered based on specific requirements and design constraints.

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