PCA9555RGERG4

Product Overview

Category: Integrated Circuit (IC)

Use: The PCA9555RGERG4 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 - Low standby current consumption - Compatible with both I2C-bus and SMBus protocols - Wide operating voltage range: 2.3V to 5.5V - Schmitt trigger input allows for slow input transition and noise rejection - Internal power-on reset - Noise filter on SCL/SDA inputs - ESD protection exceeds JESD 22, 2000-V human-body model (A114-A) - Available in a small 24-pin VQFN package

Package: The PCA9555RGERG4 is available in a 24-pin VQFN (Very Thin Quad Flat No-Lead) package.

Essence: The essence of PCA9555RGERG4 lies in its ability to expand the number of I/O pins available to microcontrollers, enabling them to interface with a larger number of external devices.

Packaging/Quantity: The PCA9555RGERG4 is typically sold in reels, with 2500 units per reel.

Specifications

• Supply Voltage Range: 2.3V to 5.5V
• Input/Output Voltage Range: 0V to VDD
• Maximum Output Current: ±10mA
• Standby Current: 1µA (typical)
• Operating Temperature Range: -40°C to +85°C

Pin Configuration

The PCA9555RGERG4 has a total of 24 pins, which are assigned specific functions. 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

• 16 programmable I/O pins that can be configured as inputs or outputs
• Individual pin direction control
• Interrupt output capability for each I/O pin
• Internal power-on reset to ensure proper initialization
• Noise filter on SCL/SDA inputs for improved signal integrity
• Schmitt trigger input allows for slow input transition and noise rejection
• ESD protection exceeding industry standards

Advantages and Disadvantages

Advantages: - Provides additional I/O pins for microcontrollers with limited GPIOs - Compatible with popular I2C-bus and SMBus protocols - Low standby current consumption helps conserve power - Wide operating voltage range allows for flexibility in various applications - Small package size saves board space

Disadvantages: - Limited to 16 I/O pins, may not be sufficient for certain applications requiring more I/Os - Requires I2C-bus or SMBus interface support from the microcontroller

Working Principles

The PCA9555RGERG4 communicates with the microcontroller via the I2C-bus or SMBus interface. It acts as an I/O expander, allowing the microcontroller to control and monitor the state of the 16 programmable I/O pins. The direction (input/output) of each pin can be individually configured, and interrupt outputs are available for each pin.

Application Field Plans

The PCA9555RGERG4 finds applications in various fields where additional I/O pins are required. Some potential application areas include: - Industrial automation - Home automation - Internet of Things (IoT) devices - Robotics - Sensor interfaces - Keypad scanning

Alternative Models

There are several alternative models available that offer similar functionality to the PCA9555RGERG4. Some notable alternatives include: - MCP23017 - PCF8574 - MAX7313 - TCA9539

These alternative models can be considered based on specific requirements and compatibility with the target microcontroller.

In conclusion, the PCA9555RGERG4 is a versatile I/O expander IC that provides additional GPIO pins for microcontrollers. Its compact size, low power consumption, and compatibility with popular