PCAL9555AHF,128

Product Overview

• Category: Integrated Circuit
• Use: GPIO Expander
• Characteristics: High-speed I2C-bus interface, 16-bit general-purpose input/output (GPIO) expander, low standby current, wide voltage range
• Package: TSSOP, QFN
• Essence: Expands the number of available GPIO pins on a microcontroller or other digital devices
• Packaging/Quantity: Tape and Reel, 2500 units per reel

Specifications

• Supply Voltage: 1.65V to 5.5V
• I/O Voltage: 1.8V to 5.5V
• Standby Current: 10 µA (typical)
• Operating Temperature Range: -40°C to +85°C
• Number of GPIO Pins: 16
• I2C-bus Interface Speed: Up to 400 kHz

Detailed Pin Configuration

The PCAL9555AHF,128 has a total of 24 pins. The pin configuration is as follows:

1. SDA - Serial Data Input/Output
2. SCL - Serial Clock Input
3. INT - Interrupt Output
4. A0 - Address Input Bit 0
5. A1 - Address Input Bit 1
6. A2 - Address Input Bit 2
7. GND - Ground
8. P0 - General Purpose I/O Pin 0
9. P1 - General Purpose I/O Pin 1
10. P2 - General Purpose I/O Pin 2
11. P3 - General Purpose I/O Pin 3
12. P4 - General Purpose I/O Pin 4
13. P5 - General Purpose I/O Pin 5
14. P6 - General Purpose I/O Pin 6
15. P7 - General Purpose I/O Pin 7
16. P10 - General Purpose I/O Pin 10
17. P11 - General Purpose I/O Pin 11
18. P12 - General Purpose I/O Pin 12
19. P13 - General Purpose I/O Pin 13
20. P14 - General Purpose I/O Pin 14
21. P15 - General Purpose I/O Pin 15
22. VCC - Supply Voltage
23. RESET - Reset Input
24. NC - No Connection

Functional Features

• High-speed I2C-bus interface for easy integration with microcontrollers and other digital devices
• 16-bit GPIO expander provides additional I/O pins for controlling external devices
• Low standby current ensures power efficiency in battery-powered applications
• Wide voltage range allows compatibility with various supply voltages

Advantages and Disadvantages

Advantages: - Easy to use and integrate into existing systems - Provides additional GPIO pins without the need for complex wiring or hardware modifications - Low standby current helps conserve power in portable devices - Wide voltage range enhances flexibility in different applications

Disadvantages: - Limited number of GPIO pins (16) compared to some other expanders - May require additional components for certain applications, such as pull-up resistors

Working Principles

The PCAL9555AHF,128 operates as a GPIO expander by communicating with a microcontroller or other digital devices through the I2C-bus interface. It expands the available GPIO pins by providing 16 general-purpose I/O pins that can be configured as inputs or outputs. The device is controlled by sending commands and data over the I2C bus, allowing the microcontroller to read or write to the GPIO pins.

Detailed Application Field Plans

The PCAL9555AHF,128 can be used in various applications that require additional GPIO pins. Some potential application fields include:

1. Industrial Automation: Control and monitor multiple sensors and actuators in industrial automation systems.
2. Home Automation: Expand the number of controllable devices in smart home systems, such as lighting, HVAC, and security systems.
3. Consumer Electronics: Interface with external peripherals, such as buttons, switches, and displays, in consumer electronic devices.
4. Automotive: Control various functions in automotive applications, including infotainment systems, lighting, and climate control.
5. Internet of Things (IoT): Enable connectivity and control for IoT devices, allowing them to interact with the physical world.

Detailed and Complete Alternative Models

• PCA9535
• MCP23017
• MAX7313
• TCA6416A
• SX1509

These alternative models offer similar functionality as the PCAL9555AHF,128 and can be considered as alternatives based on specific requirements and compatibility with existing systems.

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