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Name: PCA9554APWR
Brand: Texas Instruments
SKU: PCA9554APWR
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 PCA9554APWR

Part No.:: PCA9554APWR

Manufacturer:: Texas Instruments

Package:: 16-TSSOP (0.173, 4.40mm Width)

Datasheet:: PCA9554APWR.pdf

Description:: IC I/O EXPANDER I2C 8B 16TSSOP

In Stock:: 3078

Quantity:: Add To Cart

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PCA9554APWR Specifications

Package/Case:
16-TSSOP (0.173, 4.40mm Width)
Packaging:
Tape & Reel (TR),Cut Tape (CT),Digi-Reel®,Bulk
Series:
-
ProductStatus:
Not For New Designs
NumberofI/O:
8
Interface:
I²C, SMBus
InterruptOutput:
Yes
Features:
POR
OutputType:
Push-Pull
Current-OutputSource/Sink:
10mA, 25mA
ClockFrequency:
400 kHz
Voltage-Supply:
2.3V ~ 5.5V
OperatingTemperature:
-40°C ~ 85°C
MountingType:
Surface Mount

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PCA9554APWR information

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PCA9554APWR Typical application Circuitry

PCA9554APWR

The PCA9554APWR is an 8-bit I²C-bus and SMBus I/O expander with an interrupt function, engineered to provide additional input/output (I/O) capability to a microcontroller or processor, particularly in scenarios where I/O pin availability is limited.

Features of PCA9554APWR

1. I/O Expansion: The PCA9554APWR offers an 8-bit I/O port expansion, allowing for an increase in the number of I/O ports available to a microcontroller.

2. Interrupt Output: It features an interrupt output, enabling the device to signal the microcontroller when input changes occur.

3. Communication Interface: Equipped with an I²C-bus interface, ensuring easy integration with most microcontrollers or processors.

4. Configurable Polarity: Input polarity inversion register to invert the polarity of the input port data.

Application Scenario: Home Automation Interface

In a home automation interface, the PCA9554APWR can be used to manage various input devices like sensors and switches, thereby expanding the I/O capability of the central home automation controller. Below is a detailed connection guide for this application:

Circuit Connection Details

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

- Supplying Power to the Chip: Connect a stable power source to VDD (Pin 16) to power the PCA9554APWR. Ground VSS (Pin 8) to complete the power circuit.

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

- Connecting Sensors and Switches: Wire the home automation sensors and switches to the I/O ports (P0-P7). The specific configuration will depend on the home automation system's design and the devices being interfaced.

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

- Microcontroller Communication: Connect SDA (Pin 15) and SCL (Pin 14) to the I²C data and clock lines on the microcontroller. This allows for communication between the PCA9554APWR and the microcontroller.

4. Interrupt Configuration (INT - Pin 13):

- Input Change Notification: Connect INT (Pin 13) to an interrupt pin on the microcontroller. This enables the PCA9554APWR to alert the microcontroller when any input state changes.

5. Address Pins (A0-A2 - Pins 10-12):

- Setting I²C Address: Configure A0, A1, and A2 (Pins 10-12) 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 PCA9554APWR, consider the following:

1. I/O Pin Requirements: Ensure the number of I/O pins needed for the sensors and switches does not exceed the 8-bit limit of the PCA9554APWR.

2. I²C Bus Addressing: Properly address the PCA9554APWR, 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 attentively considering these aspects and utilizing the functionalities and pin configurations of the PCA9554APWR, one can effectively integrate this I/O expander into sophisticated applications like a home automation interface. The PCA9554APWR, with its I/O expansion and interrupt signaling capabilities, is an excellent choice for enhancing the I/O capabilities of a central microcontroller in complex systems.

PCA9554APWR FAQ

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6. What is the process for return or replacement of PCA9554APWR?

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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 PCA9554APWR.

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

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