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PCA9557DBR
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PCA9557DBR

Product Overview

Category: Integrated Circuit (IC)

Use: The PCA9557DBR is a 8-bit I2C-bus and SMBus I/O expander designed for applications that require additional I/O pins. It provides remote I/O expansion for most microcontroller families via the I2C-bus interface.

Characteristics: - 8-bit remote I/O port with interrupt output - Low standby current consumption of 1 µA - Compatible with I2C-bus and SMBus interfaces - Schmitt trigger action allows slow input transition and better noise immunity - Internal power-on reset - Noise filter on SCL/SDA inputs - Latched outputs with high-current drive capability for directly driving LEDs - Active LOW interrupt output - ESD protection exceeds 2000 V HBM per JESD22-A114, 200 V MM per JESD22-A115, and 1000 V CDM per JESD22-C101

Package: SSOP (Shrink Small Outline Package)

Essence: The PCA9557DBR is an integrated circuit that expands the number of available I/O pins in microcontroller-based systems. It offers a convenient solution for applications requiring additional I/O ports.

Packaging/Quantity: The PCA9557DBR is typically sold in reels containing 2500 units.

Specifications

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

Detailed Pin Configuration

The PCA9557DBR has a total of 16 pins. The pin configuration is as follows:

  1. SDA (Serial Data)
  2. SCL (Serial Clock)
  3. A0 (Address Bit 0)
  4. A1 (Address Bit 1)
  5. A2 (Address Bit 2)
  6. INT (Interrupt Output)
  7. P7 (I/O Port 7)
  8. P6 (I/O Port 6)
  9. P5 (I/O Port 5)
  10. P4 (I/O Port 4)
  11. P3 (I/O Port 3)
  12. P2 (I/O Port 2)
  13. P1 (I/O Port 1)
  14. P0 (I/O Port 0)
  15. GND (Ground)
  16. VDD (Supply Voltage)

Functional Features

  • Remote I/O expansion via I2C-bus interface
  • Low power consumption in standby mode
  • Schmitt trigger action for noise immunity
  • Power-on reset functionality
  • Latched outputs with high-current drive capability
  • ESD protection for enhanced reliability

Advantages and Disadvantages

Advantages: - Provides additional I/O ports for microcontroller-based systems - Compatible with popular I2C-bus and SMBus interfaces - Low standby current consumption helps conserve power - Noise filter on inputs improves signal integrity - High-current drive capability allows direct LED driving

Disadvantages: - Limited to 8-bit remote I/O expansion - Requires I2C-bus or SMBus support from the microcontroller

Working Principles

The PCA9557DBR communicates with the microcontroller through the I2C-bus interface. It acts as an I/O expander, allowing the microcontroller to control and monitor the state of the additional I/O pins provided by the PCA9557DBR. The device can be addressed using different combinations of address bits (A0, A1, and A2) to support multiple devices on the same bus.

Detailed Application Field Plans

The PCA9557DBR finds applications in various fields where additional I/O ports are required. Some potential application areas include: - Industrial automation - Home automation - Internet of Things (IoT) devices - Robotics - Automotive electronics - Consumer electronics

Detailed and Complete Alternative Models

  • PCA9555DBR: Similar to PCA9557DBR but with 16-bit remote I/O expansion capability.
  • MCP23017-E/SP: 16-bit I/O expander with I2C-bus interface.
  • MAX7313ATG+: 16-bit I/O expander with serial interface.
  • PCF8574APW: 8-bit I/O expander with I2C-bus interface.

These alternative models offer similar functionality and can be considered as substitutes for the PCA9557DBR depending on specific requirements.

In conclusion, the PCA9557DBR

Liste 10 almindelige spørgsmål og svar relateret til anvendelsen af PCA9557DBR i tekniske løsninger

Sure! Here are 10 common questions and answers related to the application of PCA9557DBR:

  1. Q: What is PCA9557DBR? A: PCA9557DBR is a 16-bit I/O expander with an I2C interface, commonly used for expanding the number of available GPIO pins in microcontroller-based systems.

  2. Q: How many GPIO pins does PCA9557DBR provide? A: PCA9557DBR provides 16 GPIO pins that can be configured as inputs or outputs.

  3. Q: What is the operating voltage range of PCA9557DBR? A: PCA9557DBR operates within a voltage range of 2.3V to 5.5V.

  4. Q: Can PCA9557DBR handle higher voltages than its operating range? A: No, PCA9557DBR is not designed to handle voltages higher than its specified operating range.

  5. Q: How do I communicate with PCA9557DBR using I2C? A: PCA9557DBR uses the I2C protocol for communication. You need to connect it to your microcontroller's I2C bus and send appropriate commands to read or write data.

  6. Q: Can PCA9557DBR be used as an input-only or output-only expander? A: Yes, PCA9557DBR can be configured as an input-only or output-only expander based on your requirements.

  7. Q: What is the maximum current that PCA9557DBR can source/sink per GPIO pin? A: PCA9557DBR can source/sink up to 25mA per GPIO pin.

  8. Q: Can PCA9557DBR be used in applications requiring interrupt functionality? A: Yes, PCA9557DBR supports interrupt functionality on its GPIO pins, allowing you to detect and respond to changes in input states.

  9. Q: Can multiple PCA9557DBR devices be connected together on the same I2C bus? A: Yes, multiple PCA9557DBR devices can be connected together on the same I2C bus by assigning unique addresses to each device.

  10. Q: Are there any application examples where PCA9557DBR is commonly used? A: PCA9557DBR is often used in applications such as industrial automation, home automation, robotics, and IoT devices where additional GPIO pins are required.

Please note that these answers are general and may vary based on specific implementation details and requirements.