PCA9539DWR

Product Overview

Category: Integrated Circuit (IC)

Use: The PCA9539DWR is a versatile 16-bit I2C-bus I/O expander designed for general-purpose input/output expansion in various electronic applications.

Characteristics: - 16 programmable GPIO pins - I2C-bus interface for easy communication with microcontrollers - Low standby current consumption - Wide operating voltage range - High noise immunity - Schmitt-trigger action on all inputs - Open-drain interrupt output - Internal power-on reset

Package: The PCA9539DWR is available in a small-sized SOIC-24 package, which ensures ease of integration into compact electronic devices.

Essence: This IC serves as an efficient solution for expanding the number of input/output pins in electronic systems, providing flexibility and scalability.

Packaging/Quantity: The PCA9539DWR is typically sold in reels containing 2500 units per reel.

Specifications

• Supply Voltage: 2.3V to 5.5V
• Input/Output Voltage Range: 0V to VDD
• Maximum Output Current: 25mA per channel
• Operating Temperature Range: -40°C to +85°C
• I2C-bus Frequency: Up to 400kHz

Pin Configuration

The PCA9539DWR features a total of 24 pins, distributed as follows:

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| | | 1 12 | | 2 11 | | 3 10 | | 4 9 | | 5 8 | | 6 7 | |_______________| ```

Pin Description: 1. SDA - Serial Data Input/Output 2. SCL - Serial Clock Input 3-10. P0-P7 - General Purpose I/O Pins 11-12. INT - Interrupt Output

Functional Features

1. I2C-bus Interface: The PCA9539DWR utilizes the I2C-bus protocol, allowing seamless communication with microcontrollers and other devices.
2. Programmable GPIO Pins: All 16 pins can be individually configured as inputs or outputs, providing flexibility in system design.
3. Interrupt Output: The IC generates an interrupt signal when any of the input pins experience a state change, enabling efficient event-driven systems.
4. Schmitt-trigger Action: The Schmitt-trigger action on all inputs ensures high noise immunity and reliable operation in noisy environments.
5. Power-on Reset: The internal power-on reset feature guarantees proper initialization of the device upon power-up.

Advantages and Disadvantages

Advantages: - Compact package size enables integration into space-constrained designs. - Wide operating voltage range allows compatibility with various power supply configurations. - Low standby current consumption minimizes power consumption in idle states. - High noise immunity ensures reliable operation in noisy environments. - Programmable GPIO pins offer flexibility in system design.

Disadvantages: - Limited number of GPIO pins may not suffice for applications requiring extensive I/O expansion. - Lack of built-in protection features against overvoltage or reverse polarity.

Working Principles

The PCA9539DWR operates by receiving commands and data through the I2C-bus interface from a microcontroller or host device. It interprets these commands to configure the GPIO pins as either inputs or outputs. The IC continuously monitors the input pins for changes in their logic levels and generates an interrupt output whenever a state change is detected. The output pins can be controlled by writing to the corresponding registers via the I2C-bus.

Detailed Application Field Plans

The PCA9539DWR finds applications in various fields, including but not limited to: - Industrial automation - Home automation - Internet of Things (IoT) devices - Robotics - Automotive electronics - Consumer electronics

Detailed and Complete Alternative Models

1. PCA9555PW: 16-bit I2C-bus I/O expander with interrupt output.
2. MCP23017-E/SP: 16-bit I2C-bus I/O expander with serial interface.
3. MAX7313AUG+: 16-bit I2C-bus I/O expander with push-pull outputs.

These alternative models offer similar functionality to the PCA9539DWR and can be considered as alternatives based on specific project requirements.

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