PCA9555DWRG4

Product Overview

Category: Integrated Circuit (IC)

Use: The PCA9555DWRG4 is a 16-bit I2C-bus and SMBus I/O expander designed for applications that require additional I/O pins. It provides general-purpose remote I/O expansion for most microcontroller families via the I2C-bus interface.

Characteristics: - 16 programmable GPIO pins - I2C-bus and SMBus compatible - Low standby current consumption - Wide operating voltage range: 2.3V to 5.5V - Schmitt trigger input with hysteresis - Noise filter on SDA/SCL inputs - Internal power-on reset - Active-low interrupt output - ESD protection exceeds JESD 22, 2000V HBM

Package: SOIC (Small Outline Integrated Circuit) package

Essence: The PCA9555DWRG4 is an essential component for expanding the number of I/O pins available in microcontroller-based systems. It allows designers to connect multiple devices and peripherals without the need for complex wiring or additional microcontrollers.

Packaging/Quantity: The PCA9555DWRG4 is typically sold in reels of 2500 units per reel.

Specifications

• Operating Voltage: 2.3V to 5.5V
• Supply Current: 1.6 mA (max)
• I/O Voltage Level: 0V to VDD
• Maximum Clock Frequency: 400 kHz
• Operating Temperature Range: -40°C to +85°C

Pin Configuration

The PCA9555DWRG4 has a total of 24 pins. The pin configuration is as follows:

```

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| | | 1 24 | | | | 2 23 | | | | 3 22 | | | | 4 21 | | | | 5 20 | | | | 6 19 | | | | 7 18 | | | | 8 17 | | | | 9 16 | | | |10 15 | | | |11 14 | | | |12 13 | |_______________| ```

Functional Features

• I2C-bus and SMBus compatible, allowing easy integration with various microcontroller families.
• Provides 16 programmable GPIO pins, enabling flexible I/O expansion.
• Low standby current consumption ensures energy efficiency in battery-powered applications.
• Schmitt trigger input with hysteresis allows for noise-immune signal processing.
• Internal power-on reset ensures reliable operation during power-up.
• Active-low interrupt output for efficient event notification.

Advantages and Disadvantages

Advantages: - Simplifies I/O expansion in microcontroller-based systems. - Easy integration with various microcontroller families. - Low power consumption. - Noise-filtering capabilities. - Robust ESD protection.

Disadvantages: - Limited to 16 GPIO pins, may not be sufficient for complex applications requiring a large number of I/Os. - Requires I2C-bus or SMBus interface support from the microcontroller.

Working Principles

The PCA9555DWRG4 operates as an I/O expander by communicating with the microcontroller via the I2C-bus or SMBus interface. The microcontroller sends commands and data to the PCA9555DWRG4, which then controls the state (input or output) of its GPIO pins accordingly. This allows the microcontroller to effectively control and monitor external devices or peripherals.

Detailed Application Field Plans

The PCA9555DWRG4 finds applications in various fields, including but not limited to: - Industrial automation - Home automation - Internet of Things (IoT) devices - Robotics - Automotive electronics - Consumer electronics

In industrial automation, the PCA9555DWRG4 can be used to expand the number of I/Os available for connecting sensors, actuators, and other peripheral devices. In home automation, it enables the control of lighting systems, HVAC (Heating, Ventilation, and Air Conditioning) systems, and security devices. In IoT devices, it facilitates the connection of multiple sensors and actuators to a central microcontroller. In robotics, it provides additional I/Os for controlling motors, sensors, and communication interfaces. In automotive electronics, it assists in expanding the I/O capabilities for various vehicle systems. In consumer electronics, it enables the integration of additional features and functionalities.

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