NXP USA Inc.
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PCA8574ATS,118
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PCA8574ATS,118

Product Overview

  • Category: Integrated Circuit (IC)
  • Use: I/O Expander
  • Characteristics: 8-bit remote I/O expander for I2C-bus with interrupt
  • Package: TSSOP (Thin Shrink Small Outline Package)
  • Essence: The PCA8574ATS,118 is a versatile I/O expander that allows users to increase the number of input/output pins on a microcontroller or other devices.
  • Packaging/Quantity: Available in reels of 2500 units

Specifications

  • Supply Voltage: 2.3V to 5.5V
  • I/O Voltage: 1.8V to 5.5V
  • Number of I/O Pins: 8
  • Maximum Sink/Source Current per Pin: 25mA
  • Operating Temperature Range: -40°C to +85°C
  • Communication Interface: I2C-bus (Two-wire Serial Interface)

Detailed Pin Configuration

The PCA8574ATS,118 has a total of 16 pins, which are assigned as follows:

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

Functional Features

  • I2C-bus compatible interface for easy integration with microcontrollers and other devices.
  • 8-bit bidirectional input/output port.
  • Interrupt output pin to indicate changes in the input pins' state.
  • Low standby current consumption, making it suitable for battery-powered applications.
  • Internal power-on reset to ensure proper initialization.

Advantages and Disadvantages

Advantages: - Provides additional I/O pins, expanding the capabilities of microcontrollers. - Easy to use and integrate into existing systems. - Supports interrupt functionality for efficient event-driven programming. - Low power consumption makes it suitable for portable and battery-powered devices.

Disadvantages: - Limited number of I/O pins (8) compared to some other expanders. - Requires an I2C-bus interface, which may not be available on all microcontrollers or devices.

Working Principles

The PCA8574ATS,118 operates as an I/O expander by communicating with a microcontroller or other devices through the I2C-bus interface. It can be configured as either an input or output port individually for each pin. The device monitors the state of its input pins and provides the corresponding output on the output pins. Changes in the input pins' state can trigger an interrupt signal on the INT pin, allowing the microcontroller to respond promptly.

Detailed Application Field Plans

The PCA8574ATS,118 finds applications in various fields, including:

  1. Home Automation: Used to control and monitor multiple sensors and actuators in smart home systems.
  2. Industrial Automation: Enables expansion of I/O capabilities in industrial control systems.
  3. Automotive Electronics: Integrates additional I/O pins for controlling various functions in vehicles.
  4. Internet of Things (IoT): Facilitates connectivity and control of multiple devices in IoT applications.
  5. Robotics: Provides additional I/O ports for interfacing with sensors, motors, and other peripherals in robotic systems.

Detailed and Complete Alternative Models

  1. PCA8574APW,118: Similar to PCA8574ATS,118 but available in a TSSOP package.
  2. MCP23008: 8-bit I/O expander with I2C-bus interface from Microchip Technology.
  3. PCF8574: 8-bit I/O expander with I2C-bus interface from NXP Semiconductors.

(Note: The above list is not exhaustive and there are several other alternative models available in the market.)

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10 domande e risposte comuni relative all'applicazione di PCA8574ATS,118 nelle soluzioni tecniche

Sure! Here are 10 common questions and answers related to the application of PCA8574ATS,118:

  1. Q: What is PCA8574ATS,118? A: PCA8574ATS,118 is an I/O expander with 8-bit remote I/O ports that can be controlled through the I2C bus.

  2. Q: What is the purpose of using PCA8574ATS,118 in technical solutions? A: PCA8574ATS,118 allows for expanding the number of input/output pins available on a microcontroller or other devices.

  3. Q: How many I/O ports does PCA8574ATS,118 have? A: PCA8574ATS,118 has 8 I/O ports, which can be configured as either inputs or outputs.

  4. Q: What is the communication protocol used by PCA8574ATS,118? A: PCA8574ATS,118 uses the I2C (Inter-Integrated Circuit) protocol for communication with the host microcontroller.

  5. Q: Can PCA8574ATS,118 be used with both 3.3V and 5V microcontrollers? A: Yes, PCA8574ATS,118 is compatible with both 3.3V and 5V microcontrollers, as it supports a wide supply voltage range.

  6. Q: How do I configure the I/O ports of PCA8574ATS,118? A: The configuration of I/O ports is done by writing appropriate values to the control registers of PCA8574ATS,118.

  7. Q: Can PCA8574ATS,118 be used for driving LEDs or relays? A: Yes, PCA8574ATS,118 can be used to drive LEDs or relays by configuring the corresponding I/O ports as outputs.

  8. Q: Is it possible to read the state of an input pin using PCA8574ATS,118? A: Yes, PCA8574ATS,118 allows reading the state of an input pin by configuring the corresponding I/O port as an input.

  9. Q: Can multiple PCA8574ATS,118 devices be used together in a system? A: Yes, multiple PCA8574ATS,118 devices can be connected to the same I2C bus, allowing for further expansion of I/O ports.

  10. Q: Are there any limitations or considerations when using PCA8574ATS,118? A: Some considerations include the maximum current sourcing/sinking capability per I/O pin and the maximum frequency of the I2C bus.

Please note that these answers are general and may vary depending on the specific implementation and requirements of your technical solution.