PCA9535DBQR

Product Overview

Category: Integrated Circuit (IC)

Use: The PCA9535DBQR is a 16-bit I2C-bus and SMBus I/O expander optimized for dimming LEDs in applications such as backlight control, keypad illumination, and general-purpose output expansion. It provides 16 bits of General Purpose parallel Input/Output (GPIO) expansion with interrupt and reset for the I2C-bus/SMBus protocol.

Characteristics: - 16-bit I/O expander - I2C-bus and SMBus compatible - Low standby current consumption - Interrupt output capability - Internal power-on reset - Noise filter on SCL/SDA inputs - 400 kHz Fast-mode I2C-bus - 2.3V to 5.5V supply voltage range - ESD protection exceeds JESD 22

Package: SSOP (Shrink Small Outline Package)

Essence: The PCA9535DBQR is an essential component for controlling and expanding the number of GPIO pins in various electronic devices. It allows for efficient LED dimming and general-purpose output expansion.

Packaging/Quantity: The PCA9535DBQR is typically available in reels or tubes, containing a specified quantity of ICs per package.

Specifications

• Supply Voltage Range: 2.3V to 5.5V
• Number of I/O Pins: 16
• I2C-bus Frequency: Up to 400 kHz
• Operating Temperature Range: -40°C to +85°C
• Package Type: SSOP-24

Pin Configuration

The PCA9535DBQR has a total of 24 pins in a SSOP package. 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-bit parallel input/output port
• I2C-bus/SMBus compatible interface
• Interrupt output with programmable polarity
• Power-on reset to default register settings
• Noise filter on SCL/SDA inputs for improved performance in noisy environments
• Low standby current consumption for power efficiency

Advantages and Disadvantages

Advantages: - Provides easy expansion of GPIO pins - Supports LED dimming applications - Compatible with I2C-bus and SMBus protocols - Low power consumption - Integrated noise filter for improved performance

Disadvantages: - Limited to 16 bits of I/O expansion - Requires knowledge of I2C-bus/SMBus protocols for proper usage

Working Principles

The PCA9535DBQR operates as an I/O expander by communicating with a microcontroller or other devices through the I2C-bus or SMBus interface. It allows the microcontroller to control and monitor the state of the 16 GPIO pins. The device can be programmed to generate interrupts based on changes in the input states, providing efficient event-driven functionality.

Detailed Application Field Plans

The PCA9535DBQR finds applications in various fields, including but not limited to: - Backlight control in LCD displays - Keypad illumination in consumer electronics - General-purpose output expansion in embedded systems - LED dimming in automotive lighting systems - Industrial automation and control systems

Alternative Models

1. PCA9534DBQR: 8-bit I2C-bus and SMBus I/O expander with similar features.
2. PCA9554ADBR: 8-bit I2C-bus and SMBus I/O expander with interrupt output capability.
3. MCP23017-E/SP: 16-bit I2C/SMBus GPIO expander with interrupt output and higher voltage range.

These alternative models provide similar functionality and can be considered as alternatives to the PCA9535DBQR based on specific requirements.

In conclusion, the PCA9535DBQR is a versatile I/O expander IC that offers 16 bits of GPIO expansion, I2C-bus/SMBus compatibility, and various features for efficient LED dimming and general-purpose output control. Its compact package and