PCA9535DW

Product Overview

Category: Integrated Circuit (IC)

Use: The PCA9535DW is a 16-bit I2C-bus and SMBus I/O expander optimized for dimming LEDs in applications such as backlight control, keypad backlighting, and general-purpose LED dimming. It provides 16 open-drain, active-low outputs that can be controlled through the I2C bus.

Characteristics: - 16-bit I/O expander - I2C-bus and SMBus compatible - Open-drain, active-low outputs - Low standby current consumption - Wide operating voltage range - High noise immunity - ESD protection exceeds 2000 V HBM per JESD22-A114 and 1000 V CDM per JESD22-C101

Package: SO20 package

Essence: The PCA9535DW is designed to simplify the control of multiple LEDs by providing a convenient interface through the I2C bus. It allows for easy dimming and control of LEDs in various applications.

Packaging/Quantity: The PCA9535DW is available in a SO20 package and is typically sold in reels of 2500 units.

Specifications

• Supply Voltage Range: 2.3 V to 5.5 V
• Input/Output Voltage Range: 0 V to VDD
• Maximum Output Current: 25 mA per channel
• Operating Temperature Range: -40°C to +85°C
• I2C-bus Frequency: 100 kHz, 400 kHz, or 1 MHz

Pin Configuration

The PCA9535DW has a total of 20 pins arranged in a SO20 package. The pin configuration is as follows:

```

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| | | 1 10 | | | | 2 11 | | | | 3 12 | | | | 4 13 | | | | 5 14 | | | | 6 15 | | | | 7 16 | | | | 8 17 | | | | 9 18 | |_______________| ```

Functional Features

• 16-bit I/O expander with open-drain outputs
• Individual LED brightness control through PWM (Pulse Width Modulation)
• Programmable output configuration
• Internal power-on reset
• Noise filter on SDA/SCL inputs
• Supports repeated start condition
• Low standby current consumption

Advantages and Disadvantages

Advantages: - Simplifies control of multiple LEDs - Flexible dimming options through PWM - Wide operating voltage range allows for compatibility with various systems - High noise immunity ensures reliable operation - ESD protection provides robustness against electrostatic discharge

Disadvantages: - Limited to 16 channels, may not be suitable for applications requiring a higher number of controlled outputs - Requires an I2C bus interface, which may add complexity to the system design

Working Principles

The PCA9535DW is controlled through the I2C bus, allowing for easy integration into existing systems. It uses PWM to control the brightness of individual LEDs connected to its outputs. The device can be programmed to set the desired output configuration and brightness levels.

Detailed Application Field Plans

The PCA9535DW finds applications in various fields where LED dimming and control are required. Some potential application areas include: - Backlight control in LCD displays - Keypad backlighting in consumer electronics - LED dimming in automotive interior lighting - General-purpose LED control in industrial automation

Detailed and Complete Alternative Models

Some alternative models that offer similar functionality to the PCA9535DW are: - PCA9555PW: 16-bit I2C-bus and SMBus I/O expander with interrupt output - MCP23017-E/SP: 16-bit I2C-bus I/O expander with interrupt output and cascading feature - MAX7313ATG+: 16-bit I2C-bus and SMBus I/O expander with integrated keypad controller

These alternative models provide options for different features and specifications, allowing users to choose the most suitable solution for their specific requirements.

In conclusion, the PCA9535DW is a versatile I/O expander designed for LED dimming and control applications. Its ease of use, flexible configuration options, and compatibility with the I2C bus make it a popular choice among designers.