PCA9535DWG4

Product Overview

Category: Integrated Circuit (IC)

Use: The PCA9535DWG4 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 input/output expansion.

Characteristics: - 16-bit remote bidirectional I/O port - Low standby current consumption of 1 µA maximum - 400 kHz I2C-bus interface - Internal power-on reset - Noise filter on SCL/SDA inputs - No glitch on power-up - Supports hot insertion - Active LOW open-drain interrupt output - Polarity inversion register - ESD protection exceeds 2000 V HBM per JESD22-A114, 200 V MM per JESD22-A115, and 1000 V CDM per JESD22-C101 - Latch-up testing is done to JEDEC Standard JESD78 which exceeds 100 mA

Package: SOIC (Small Outline Integrated Circuit) package

Essence: The PCA9535DWG4 is an essential component for controlling LED brightness and expanding the number of available input/output ports in various electronic devices.

Packaging/Quantity: The PCA9535DWG4 is typically sold in reels containing 2500 units.

Specifications

• Supply Voltage Range: 2.3 V to 5.5 V
• Input Voltage Range: GND to VDD
• Operating Temperature Range: -40°C to +85°C
• I2C-bus Frequency: 0 Hz to 400 kHz

Pin Configuration

The PCA9535DWG4 has a total of 24 pins. The pin configuration is as follows:

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| | | 1 2 3 | | | | 4 5 6 | | | | . . . | | | | 23 24 25 | |_______________| ```

Functional Features

• 16 programmable I/O pins
• Individual pin configuration (input or output)
• Programmable polarity inversion
• Interrupt output for pin status change detection
• Low standby current consumption for power efficiency
• ESD protection for enhanced durability

Advantages and Disadvantages

Advantages: - Versatile I/O expander for LED dimming and general-purpose expansion - Wide supply voltage range allows compatibility with various systems - Low standby current consumption minimizes power usage - Robust ESD protection ensures reliability in harsh environments

Disadvantages: - Limited to 16 I/O pins, may not be suitable for applications requiring a higher number of ports - Requires I2C-bus interface for communication, which may add complexity to the system design

Working Principles

The PCA9535DWG4 communicates with the host microcontroller through the I2C-bus interface. It can be configured as either an input or output port individually. The device supports programmable polarity inversion, allowing flexibility in signal control. The interrupt output pin provides a means for the host to detect changes in the pin status. The low standby current consumption ensures minimal power usage when the device is idle.

Detailed Application Field Plans

The PCA9535DWG4 finds application in various fields, including but not limited to: - Backlight control in LCD displays - Keypad illumination in electronic devices - General-purpose input/output expansion in embedded systems - LED dimming in automotive lighting systems

Alternative Models

Here are some alternative models that provide similar functionality to the PCA9535DWG4: - PCA9555PW, 16-bit I2C-bus and SMBus I/O expander - MCP23017-E/SP, 16-bit I/O expander with I2C interface - MAX7313AUG+, 16-bit I/O expander with serial interface

These alternative models can be considered based on specific requirements and compatibility with the system design.

In conclusion, the PCA9535DWG4 is a versatile I/O expander optimized for LED dimming and general-purpose expansion. With its programmable features, low power consumption, and robust protection, it serves as an essential component in various electronic devices and applications.