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Name: PCF8574PWR
Brand: Texas Instruments
SKU: PCF8574PWR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Any Feature, including a modified Existing Feature, that is not an Existing Feature.

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Texas Instruments PCF8574PWR

Part No.:: PCF8574PWR

Manufacturer:: Texas Instruments

Package:: 20-TSSOP (0.173, 4.40mm Width)

Datasheet:: PCF8574PWR.pdf

Description:: IC I/O EXPANDER I2C 8B 20TSSOP

In Stock:: 2859

Quantity:: Add To Cart

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PCF8574PWR Specifications

Package/Case:
20-TSSOP (0.173, 4.40mm Width)
Packaging:
Tape & Reel (TR),Cut Tape (CT),Digi-Reel®,Bulk
Series:
-
ProductStatus:
Active
NumberofI/O:
8
Interface:
I²C
InterruptOutput:
Yes
Features:
POR
OutputType:
Push-Pull
Current-OutputSource/Sink:
1mA, 25mA
ClockFrequency:
100 kHz
Voltage-Supply:
2.5V ~ 6V
OperatingTemperature:
-40°C ~ 85°C
MountingType:
Surface Mount

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PCF8574PWR information

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PCF8574PWR Typical application Circuitry

PCF8574PWR

The PCF8574PWR is a remote 8-bit I/O expander for the I²C-bus, providing an easy way to add additional I/O ports to a microcontroller. Without a microcontroller to configure, each pin can be utilized as an input or an output.

PCF8574PWR Features

1. I/O Expansion: The PCF8574PWR offers an 8-bit I/O expansion, allowing the addition of more I/O ports to a microcontroller.

2. Interrupt Output: It features an interrupt output, signaling the microcontroller when input changes occur.

3. Communication Interface: Equipped with an I²C-bus interface, it can easily integrate with most microcontrollers or processors.

4. Voltage Compatibility: Operates over a wide voltage range, suitable for various system requirements.

Application Scenario: Home Security System

In a home security system, the PCF8574PWR can be used to manage multiple sensors and alarms, thereby expanding the I/O capability of the central microcontroller. Here's a detailed connection guide for this application:

Circuit Connection Details

1. Power Supply (VDD - Pin 16, VSS - Pin 8):

- Powering the Device: Connect a stable power source to VDD (Pin 16) to power the PCF8574PWR. Ground VSS (Pin 8) to complete the power circuit.

2. I/O Ports (P0-P7 - Pins 1-7, Pin 9):

- Sensor and Alarm Wiring: Connect various sensors and alarms to the I/O ports (P0-P7). The gadgets utilized and the design of the home security system will determine the exact configuration.

3. I²C Communication (SDA - Pin 15, SCL - Pin 14):

- Microcontroller Data Exchange: Link SDA (Pin 15) and SCL (Pin 14) to the corresponding I²C data and clock lines on the microcontroller. This allows for communication between the PCF8574PWR and the microcontroller.

4. Interrupt Configuration (INT - Pin 10):

- Input Change Notification: Connect INT (Pin 10) to an interrupt pin on the microcontroller. This enables the PCF8574PWR to alert the microcontroller when any input state changes.

5. Address Pins (A0-A2 - Pins 11-13):

- I²C Address Setting: Configure A0, A1, and A2 (Pins 11-13) for the I²C address. This is important when multiple devices are connected to the same I²C bus.

Design Considerations

When designing a circuit with the PCF8574PWR, consider the following:

1. I/O Pin Requirements: Ensure the number of I/O pins needed for the sensors and alarms does not exceed the 8-bit limit of the PCF8574PWR.

2. I²C Bus Addressing: Properly address the PCF8574PWR, especially when there are multiple I/O expanders or devices on the same I²C bus.

3. Power Supply Stability: Provide a stable and noise-free power supply to ensure consistent performance of the I/O expander.

4. Interrupt Management: Efficiently handle the interrupt signal to ensure the microcontroller can promptly respond to changes in the input states.

By carefully considering these aspects and leveraging the features and pin configurations of the PCF8574PWR, one can effectively integrate this I/O expander into sophisticated applications like a home security system. The PCF8574PWR, with its capability for I/O expansion and interrupt signaling, is an excellent choice for enhancing the I/O capabilities of a central microcontroller in complex systems.

PCF8574PWR FAQ

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(1)Such as a deficiency in quantity, delivery of wrong items, and apparent external defects (breakage and rust, etc.), and we acknowledge such problems.

(2)We are informed of the defect described above within 90 days after the delivery of PCF8574PWR.

(3)The PartNo is unused and only in the original unpacked packaging.

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