PCAL9554BBSHP

Product Overview

• Category: Integrated Circuit
• Use: GPIO Expander
• Characteristics: High-Speed I2C, Low-Voltage Level Shifter, Interrupt Output, Open-Drain Outputs
• Package: 24-pin SSOP (Shrink Small Outline Package)
• Essence: The PCAL9554BBSHP is a versatile GPIO expander designed for various applications requiring additional input/output pins.
• Packaging/Quantity: Available in tape and reel packaging with 2500 units per reel.

Specifications

• Supply Voltage: 1.65V to 5.5V
• I/O Voltage: 1.8V to 5.5V
• Maximum I/O Current: ±25mA
• Maximum Sink Current: 25mA
• Maximum Source Current: -25mA
• Operating Temperature Range: -40°C to +85°C

Detailed Pin Configuration

The PCAL9554BBSHP has a total of 24 pins, which are assigned specific functions. Here is the detailed pin configuration:

| Pin Number | Pin Name | Function | |------------|----------|----------| | 1 | SDA | I2C Serial Data Input/Output | | 2 | SCL | I2C Serial Clock Input | | 3 | INT | Interrupt Output | | 4-7 | P0-P3 | General Purpose I/O Pins | | 8-15 | P4-P11 | General Purpose I/O Pins | | 16-23 | P12-P19 | General Purpose I/O Pins | | 24 | GND | Ground |

Functional Features

• Provides 20 general-purpose I/O pins that can be configured as inputs or outputs.
• Supports high-speed I2C communication for easy integration with microcontrollers and other devices.
• Features a low-voltage level shifter, allowing compatibility with different voltage levels.
• Offers an interrupt output pin to notify the host controller of input changes.
• All I/O pins are open-drain outputs, providing flexibility in connecting external components.

Advantages and Disadvantages

Advantages

• Versatile GPIO expander suitable for various applications.
• High-speed I2C communication enables fast data transfer.
• Low-voltage level shifter ensures compatibility with different voltage levels.
• Interrupt output simplifies event-driven programming.
• Open-drain outputs allow flexible connection options.

Disadvantages

• Limited number of I/O pins (20) compared to some other expanders available in the market.
• Requires an external pull-up resistor for proper I2C bus operation.

Working Principles

The PCAL9554BBSHP operates as a slave device on the I2C bus. It communicates with the host controller using the I2C serial interface, which allows for bidirectional data transfer. The host controller can configure each I/O pin as an input or output and read or write data accordingly.

When configured as an input, the PCAL9554BBSHP monitors the state of the corresponding pin and generates an interrupt if a change is detected. This feature is useful for applications that require real-time response to external events.

When configured as an output, the PCAL9554BBSHP can drive the pin low (sink current) or leave it floating (open-drain). This flexibility allows for interfacing with various external components, such as LEDs, switches, and sensors.

Detailed Application Field Plans

The PCAL9554BBSHP finds applications in a wide range of fields, including:

1. Industrial automation: Used for controlling and monitoring multiple devices in industrial systems.
2. Consumer electronics: Provides additional I/O pins for user interface elements like buttons, LEDs, and displays.
3. Internet of Things (IoT): Enables expansion of GPIO capabilities in IoT devices for sensor interfacing and control.
4. Automotive: Used in automotive applications for controlling various subsystems and interfaces.
5. Medical devices: Provides extra I/O pins for medical equipment, allowing for enhanced functionality.

Detailed and Complete Alternative Models

1. PCAL9554A: Similar to PCAL9554BBSHP but available in a different package (16-pin TSSOP).
2. MCP23017: GPIO expander with 16 I/O pins and I2C interface.
3. PCA9538: 8-bit I/O expander with I2C interface and interrupt output.
4. MAX7313: 16-bit I/O expander with I2C interface and configurable polarity.

These alternative models offer similar functionality and can be considered based on specific requirements and availability.

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