PCA9535PW

The PCA9535PW is an 16-bit I2C-bus I/O port with Interrupt and Reset features.The device consists of two 8-bit Configuration (Input or Output selection), Input, Output and Polarity Inversion (active HIGH or active LOW operation), and P0 and P1 with interrupt and reset features.

Pinout

(Note: The pin configuration below is a general representation. Refer to the specific datasheet for precise details.)

• P0-P7: I/O Ports 0-7
• A0-A2: Hardware Address Inputs for I2C-bus Addressing
• SCL: Serial Clock Input for I2C-bus Control
• SDA: Serial Data I/O for I2C-bus Control
• INT: Interrupt Output
• RST: Reset Input
• GND: Ground
• VCC: Positive Power Supply

Circuit Diagram

Include a circuit diagram illustrating the connections and operation of the PCA9535PW for a visual representation.

Key Features

• 16-Bit I/O Port: Provides 16 I/O pins for versatile input and output operations.
• I2C-bus Interface: Supports I2C-bus communication for easy interfacing with microcontrollers and other devices.
• Interrupt and Reset Features: Includes interrupt capabilities and a reset input for enhanced functionality.
• Configurable I/O: Each port can be independently configured as input or output.
• Polarity Inversion: Permits active HIGH or active LOW operation for flexibility in signal handling.
• Small Package: Available in a compact 24-pin TSSOP package.

Note: For detailed technical specifications, please refer to the PCA9535PW datasheet.

Application

• GPIO Expansion: Ideal for expanding the number of general-purpose I/Os in microcontroller-based systems.
• LED Control: Suitable for controlling LED arrays and displays using the I2C-bus interface.
• Button Input: Can be used for reading button states and implementing input controls in various applications.

Functionality

The PCA9535PW is a versatile I/O port expander with 16 configurable pins that can be used for a variety of input and output tasks. Its I2C-bus interface and interrupt/reset features make it a convenient choice for system expansions and control applications.

Usage Guide

• Addressing: Set the hardware address inputs (A0-A2) for proper I2C-bus addressing.
• Connection: Connect SCL and SDA to the microcontroller's I2C bus for communication.
• Configuration: Use the Configuration registers to set the direction (input/output) of individual pins.

Frequently Asked Questions

Q: Can I use multiple PCA9535PW devices on the same I2C-bus?
A: Yes, you can use multiple PCA9535PW devices on the same I2C-bus by setting unique hardware addresses using the address inputs (A0-A2).

Q: What is the maximum frequency supported by the I2C-bus interface?
A: The PCA9535PW supports standard (100 kHz) and fast (400 kHz) modes of the I2C-bus interface.