PCA8550PW/DG,118

Product Overview

• Category: Integrated Circuit
• Use: Digital I/O Expander
• Characteristics: Low-voltage, 16-bit I2C-bus and SMBus I/O expander with interrupt output, reset input, and configuration registers
• Package: TSSOP20
• Essence: The PCA8550PW/DG,118 is a versatile digital I/O expander that allows for easy expansion of the number of I/O pins available in a microcontroller-based system.
• Packaging/Quantity: Tape and Reel, 2500 units per reel

Specifications

• Supply Voltage Range: 1.65V to 5.5V
• Number of I/O Pins: 16
• I2C-bus/SMBus Interface: Compatible with I2C-bus and SMBus standards
• Interrupt Output: Open-drain output that can be connected to an interrupt input pin of a microcontroller
• Reset Input: Active-low reset input for resetting the device
• Configuration Registers: Allows customization of various features such as input/output direction, polarity inversion, and pull-up/pull-down resistors

Detailed Pin Configuration

The PCA8550PW/DG,118 has a total of 20 pins in a TSSOP package. The pin configuration is as follows:

1. SDA - Serial Data Input/Output
2. SCL - Serial Clock Input
3. INT - Interrupt Output
4. RESET - Reset Input
5. VDD - Supply Voltage
6. GND - Ground
7. P0 - General Purpose I/O Pin 0
8. P1 - General Purpose I/O Pin 1
9. P2 - General Purpose I/O Pin 2
10. P3 - General Purpose I/O Pin 3
11. P4 - General Purpose I/O Pin 4
12. P5 - General Purpose I/O Pin 5
13. P6 - General Purpose I/O Pin 6
14. P7 - General Purpose I/O Pin 7
15. P8 - General Purpose I/O Pin 8
16. P9 - General Purpose I/O Pin 9
17. P10 - General Purpose I/O Pin 10
18. P11 - General Purpose I/O Pin 11
19. P12 - General Purpose I/O Pin 12
20. P13 - General Purpose I/O Pin 13

Functional Features

• Expandable I/O: The PCA8550PW/DG,118 provides 16 additional I/O pins, allowing for easy expansion of the available I/O pins in a microcontroller-based system.
• Interrupt Output: The interrupt output pin can be connected to a microcontroller's interrupt input, enabling efficient handling of events and reducing the need for continuous polling.
• Reset Input: The active-low reset input allows for resetting the device when necessary.
• Configuration Registers: The configuration registers provide flexibility in customizing various features such as input/output direction, polarity inversion, and pull-up/pull-down resistors.

Advantages and Disadvantages

Advantages: - Easy I/O Expansion: Allows for easy expansion of I/O pins in a microcontroller-based system. - Versatility: Compatible with both I2C-bus and SMBus standards. - Interrupt Support: Provides an interrupt output for efficient event handling.

Disadvantages: - Limited Number of Pins: The PCA8550PW/DG,118 offers 16 additional I/O pins, which may not be sufficient for applications requiring a large number of I/Os. - Package Size: The TSSOP20 package may not be suitable for space-constrained designs.

Working Principles

The PCA8550PW/DG,118 operates as an I2C-bus and SMBus compatible digital I/O expander. It communicates with a microcontroller or host device through the serial data (SDA) and serial clock (SCL) lines. The device can be configured using the configuration registers to set the direction (input/output) of each I/O pin, enable/disable pull-up/pull-down resistors, and invert the polarity of input pins.

The interrupt output (INT) can be connected to an interrupt input pin of the microcontroller, allowing the device to notify the microcontroller when certain events occur on the I/O pins. The active-low reset input (RESET) resets the device when triggered.

Detailed Application Field Plans

The PCA8550PW/DG,118 can be used in various applications that require additional I/O pins, such as:

1. Industrial Automation: Control and monitoring systems that require expansion of I/O capabilities.
2. Home Automation: Smart home devices that need to interface with multiple sensors and actuators.
3. Automotive Electronics: Vehicle control modules that require additional I/Os for various functions.
4. Internet of Things (IoT