Texas Instruments
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PCA9534DWRG4
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PCA9534DWRG4

Product Overview

Category: Integrated Circuit (IC)

Use: The PCA9534DWRG4 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. It provides 16 open-drain, active-low outputs that can be configured as either inputs or outputs.

Characteristics: - 16-bit I/O expander - I2C-bus and SMBus compatible - Low standby current consumption - Wide voltage range: 2.3V to 5.5V - High noise immunity - ESD protection exceeds JESD 22

Package: SOIC (Small Outline Integrated Circuit)

Essence: The PCA9534DWRG4 is designed to simplify the control of multiple LEDs or other devices using a single I2C interface. It offers flexibility in configuring the I/O pins as inputs or outputs, making it suitable for various applications.

Packaging/Quantity: The PCA9534DWRG4 is available in a reel packaging with 2500 units per reel.

Specifications

  • Supply Voltage Range: 2.3V to 5.5V
  • Input Voltage Range: GND to VDD
  • Output Voltage Range: GND to VDD
  • Maximum Output Current: 25mA per channel
  • Operating Temperature Range: -40°C to +85°C
  • I2C-bus Frequency: Up to 400kHz

Detailed Pin Configuration

The PCA9534DWRG4 has a total of 20 pins. The pin configuration is as follows:

  1. SDA (Serial Data)
  2. SCL (Serial Clock)
  3. A0 (Address Select Bit 0)
  4. A1 (Address Select Bit 1)
  5. RESET (Active-Low Reset Input) 6-21. P0-P15 (I/O Pins)

Functional Features

  • 16 programmable I/O pins
  • Individual pin configuration as input or output
  • Active-low outputs with open-drain structure
  • Internal power-on reset
  • Noise filter on SDA/SCL inputs
  • Supports repeated start condition

Advantages and Disadvantages

Advantages: - Simplifies control of multiple LEDs or devices - Flexible pin configuration - Low standby current consumption - Wide voltage range compatibility - High noise immunity - ESD protection for robustness

Disadvantages: - Limited to 16 I/O pins - Requires I2C interface for control

Working Principles

The PCA9534DWRG4 operates by receiving commands through the I2C-bus or SMBus interface. It can be configured to function as either an input or output device for each individual pin. When used as an output, the active-low open-drain structure allows it to sink current from connected devices, such as LEDs.

The device also features a power-on reset that initializes all registers to their default values upon power-up. This ensures predictable behavior during startup.

Detailed Application Field Plans

The PCA9534DWRG4 is widely used in various applications, including but not limited to:

  1. Backlight control in LCD displays
  2. Keypad illumination in consumer electronics
  3. General-purpose input/output expansion in microcontroller-based systems
  4. LED dimming in automotive lighting systems
  5. Industrial automation for controlling external devices

Detailed and Complete Alternative Models

  1. PCA9554PW, 8-bit I2C-bus and SMBus I/O expander
  2. MCP23017-E/SP, 16-bit I2C I/O expander with interrupt output
  3. MAX7313AUG+, 16-bit I2C GPIO expander with reset

These alternative models offer similar functionality and can be considered as alternatives to the PCA9534DWRG4 based on specific requirements and compatibility with existing systems.

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Liste 10 almindelige spørgsmål og svar relateret til anvendelsen af PCA9534DWRG4 i tekniske løsninger

Sure! Here are 10 common questions and answers related to the application of PCA9534DWRG4 in technical solutions:

  1. Q: What is PCA9534DWRG4? A: PCA9534DWRG4 is a 8-bit I2C-bus and SMBus I/O expander with interrupt output and configuration registers.

  2. Q: What is the purpose of PCA9534DWRG4? A: PCA9534DWRG4 is used to expand the number of available GPIO (General Purpose Input/Output) pins on a microcontroller or other digital devices.

  3. Q: How many GPIO pins does PCA9534DWRG4 provide? A: PCA9534DWRG4 provides 8 GPIO pins that can be configured as either inputs or outputs.

  4. Q: Can PCA9534DWRG4 handle both input and output operations simultaneously? A: No, PCA9534DWRG4 can only perform either input or output operations at a given time. The mode of operation is determined by the configuration registers.

  5. Q: How is PCA9534DWRG4 controlled? A: PCA9534DWRG4 is controlled through the I2C or SMBus interface, allowing for easy integration with microcontrollers and other digital devices.

  6. Q: What is the maximum voltage that PCA9534DWRG4 can handle? A: PCA9534DWRG4 can handle a maximum voltage of 5.5V.

  7. Q: Can PCA9534DWRG4 be used with both 3.3V and 5V systems? A: Yes, PCA9534DWRG4 is compatible with both 3.3V and 5V systems, making it versatile for various applications.

  8. Q: Does PCA9534DWRG4 have built-in pull-up resistors? A: Yes, PCA9534DWRG4 has internal programmable pull-up resistors that can be enabled or disabled as per the application requirements.

  9. Q: Can PCA9534DWRG4 generate interrupts? A: Yes, PCA9534DWRG4 has an interrupt output pin that can be configured to generate interrupts based on changes in the input pins' state.

  10. Q: What are some common applications of PCA9534DWRG4? A: PCA9534DWRG4 is commonly used in applications such as LED control, keypad scanning, GPIO expansion, and general-purpose I/O interfacing.

Please note that these questions and answers are meant to provide a general understanding of PCA9534DWRG4's application and features. For detailed technical specifications and implementation guidelines, it is recommended to refer to the datasheet and application notes provided by the manufacturer.