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PCA9555DWR
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PCA9555DWR

Product Overview

Category: Integrated Circuit (IC)

Use: The PCA9555DWR is a 16-bit I/O expander with an I2C interface. It provides general-purpose remote I/O expansion for most microcontroller families via the I2C bus interface.

Characteristics: - 16 programmable GPIO pins - I2C-bus interface compatible with SMBus standards - Low standby current consumption - Noise filter on SCL/SDA inputs - Internal power-on reset - Power-up with all channels configured as inputs - Polarity inversion register - Output configuration register - Input port configuration register - Interrupt output pin for use in cascading - ESD protection exceeds 2000 V HBM per JESD22-A114, 200 V MM per JESD22-A115, and 1000 V CDM per JESD22-C101

Package: SOIC (Small Outline Integrated Circuit) package

Essence: The PCA9555DWR is designed to provide additional input/output (I/O) ports for microcontrollers that have limited I/O capabilities. It allows for easy expansion of the number of available I/O pins, enabling the connection of more peripheral devices.

Packaging/Quantity: The PCA9555DWR is typically sold in reels or tubes, with 2500 units per reel/tube.

Specifications

  • Supply Voltage: 2.3V to 5.5V
  • Operating Temperature Range: -40°C to +85°C
  • I2C Bus Frequency: Up to 400 kHz
  • Maximum Output Current: 25 mA per channel
  • Maximum Standby Current: 1 μA
  • Package Type: SOIC-24

Detailed Pin Configuration

The PCA9555DWR has a total of 24 pins, which are assigned as follows:

  • Pin 1: SDA (Serial Data)
  • Pin 2: SCL (Serial Clock)
  • Pins 3-10: GPIO0-GPIO7
  • Pins 11-18: GPIO8-GPIO15
  • Pins 19-24: GND (Ground) and VCC (Supply Voltage)

Functional Features

  • I2C-bus interface allows for easy communication with microcontrollers.
  • Programmable GPIO pins provide flexibility in configuring input or output mode.
  • Polarity inversion register enables inversion of the input/output logic levels.
  • Noise filter on SCL/SDA inputs helps to improve signal integrity.
  • Interrupt output pin facilitates cascading multiple PCA9555DWR devices.

Advantages and Disadvantages

Advantages: - Provides additional I/O ports for microcontrollers with limited I/O capabilities. - Easy integration with existing I2C-bus systems. - Low standby current consumption helps conserve power. - ESD protection ensures robustness against electrostatic discharge.

Disadvantages: - Limited maximum output current per channel (25 mA). - Requires external pull-up resistors for proper I2C bus operation.

Working Principles

The PCA9555DWR operates by communicating with a microcontroller through the I2C bus. It can be configured as either an input or output device for each of its 16 GPIO pins. The microcontroller sends commands to the PCA9555DWR to set the desired configuration and read or write data to the GPIO pins.

Detailed Application Field Plans

The PCA9555DWR finds applications in various fields, including but not limited to: - Industrial automation - Home automation - Internet of Things (IoT) devices - Robotics - Automotive electronics - Consumer electronics

Its ability to expand the number of available I/O pins makes it suitable for applications that require interfacing with multiple peripheral devices.

Detailed and Complete Alternative Models

  • PCA9555PW: Same functionality as PCA9555DWR, but in a TSSOP package.
  • MCP23017: Similar I/O expander with I2C interface from Microchip Technology.
  • PCF8574: Basic 8-bit I/O expander with I2C interface from Texas Instruments.

These alternative models offer similar features and can be used as substitutes depending on specific requirements.

Word count: 511 words

技術ソリューションにおける PCA9555DWR の適用に関連する 10 件の一般的な質問と回答をリストします。

Sure! Here are 10 common questions and answers related to the application of PCA9555DWR in technical solutions:

  1. Q: What is PCA9555DWR? A: PCA9555DWR is a 16-bit I/O expander with an I2C interface, which allows for easy expansion of digital inputs and outputs in various technical applications.

  2. Q: How many I/O pins does PCA9555DWR have? A: PCA9555DWR has 16 I/O pins that can be configured as either inputs or outputs.

  3. Q: What is the operating voltage range of PCA9555DWR? A: PCA9555DWR operates within a voltage range of 2.3V to 5.5V.

  4. Q: Can PCA9555DWR be used with both 3.3V and 5V microcontrollers? A: Yes, PCA9555DWR is compatible with both 3.3V and 5V microcontrollers, making it versatile for different system requirements.

  5. Q: How do I communicate with PCA9555DWR using the I2C interface? A: You can communicate with PCA9555DWR by sending I2C commands and data through the SDA (data) and SCL (clock) lines.

  6. Q: Can PCA9555DWR be used to drive LEDs? A: Yes, PCA9555DWR can be used to drive LEDs as it provides sink current capability on its output pins.

  7. Q: Is PCA9555DWR suitable for high-speed applications? A: PCA9555DWR is not designed for high-speed applications, but it is well-suited for general-purpose I/O expansion in various technical solutions.

  8. Q: Can PCA9555DWR be cascaded to expand the number of I/O pins? A: Yes, multiple PCA9555DWR devices can be cascaded together using the I2C interface to expand the number of available I/O pins.

  9. Q: Does PCA9555DWR have built-in pull-up resistors for its input pins? A: Yes, PCA9555DWR has programmable internal pull-up resistors that can be enabled or disabled as per the application requirements.

  10. Q: Are there any limitations on the maximum current that PCA9555DWR can sink or source? A: Yes, PCA9555DWR has a maximum current sink/source capability of 25mA per pin and 200mA total across all pins combined.

Please note that these answers are general and may vary depending on the specific implementation and datasheet of PCA9555DWR.