PCA9535DGVR

Product Overview

• Category: Integrated Circuit (IC)
• Use: GPIO Expander
• Characteristics:
  • Low-voltage, low-power consumption
  • I2C-bus interface
  • 16-bit remote bidirectional I/O port
  • Internal power-on reset
  • Noise filter on SCL/SDA inputs
  • Polarity inversion register
  • Open-drain interrupt output
  • ESD protection exceeds JESD 22
• Package: VSSOP-24
• Essence: PCA9535DGVR is a GPIO expander IC that provides additional general-purpose input/output (GPIO) pins to a microcontroller or other digital devices.
• Packaging/Quantity: Tape and Reel, 2500 units per reel

Specifications

• Supply Voltage Range: 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: 100kHz, 400kHz, or 1MHz

Pin Configuration

The PCA9535DGVR has a total of 24 pins in the VSSOP package. The pin configuration is as follows:

___________ | | 1 | 24 | GND 2 | 23 | P0 3 | 22 | P1 4 | 21 | P2 5 | 20 | P3 6 | 19 | P4 7 | 18 | P5 8 | 17 | P6 9 | 16 | P7 10 | 15 | INT 11 | 14 | SDA 12 | 13 | SCL |___________|

Functional Features

• Bidirectional I/O: Each of the 16 GPIO pins can be configured as an input or output.
• Polarity Inversion: Allows individual inversion of input/output port data.
• Interrupt Output: Provides an open-drain interrupt output that can be connected to a microcontroller's interrupt pin.
• Noise Filter: Built-in noise filter on the I2C-bus inputs for improved signal integrity.
• Power-On Reset: Internal power-on reset ensures reliable operation during power-up.

Advantages and Disadvantages

Advantages: - Low-voltage operation allows compatibility with a wide range of systems. - Low-power consumption makes it suitable for battery-powered devices. - I2C-bus interface simplifies connectivity and reduces the number of required pins on the microcontroller. - Polarity inversion feature provides flexibility in interfacing with different devices. - Integrated interrupt output enables efficient event-driven designs.

Disadvantages: - Limited number of GPIO pins (16) compared to some other expanders available in the market. - Not suitable for high-current applications due to the maximum output current limitation.

Working Principles

The PCA9535DGVR communicates with the microcontroller using the I2C-bus interface. It acts as an intermediary between the microcontroller and external devices by providing additional GPIO pins. The microcontroller can configure each pin as an input or output, read input values, write output values, and detect interrupts.

When an interrupt occurs, the PCA9535DGVR pulls the INT pin low, signaling the microcontroller to respond. The polarity inversion feature allows the microcontroller to interpret the interrupt as either a rising or falling edge, depending on the configuration.

Detailed Application Field Plans

The PCA9535DGVR is widely used in various applications that require additional GPIO pins. Some common application fields include:

1. Industrial Automation: Used for controlling sensors, actuators, and other peripheral devices in industrial automation systems.
2. Home Automation: Enables control of lights, switches, and appliances in smart home setups.
3. Automotive Electronics: Provides extra I/Os for automotive control modules, such as door locks, window controls, and lighting systems.
4. Internet of Things (IoT): Facilitates connectivity and control of IoT devices, such as environmental sensors, smart meters, and wearable gadgets.
5. Consumer Electronics: Integrated into audio/video equipment, gaming consoles, and home entertainment systems for enhanced functionality.

Detailed and Complete Alternative Models

• PCA9555PW: 16-bit I2C-bus I/O expander with similar features but different package (TSSOP-24).
• MCP23017-E/SP: 16-bit I2C/SPI GPIO expander with interrupt output and higher