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Name: PCA9554APW
Brand: Texas Instruments
SKU: PCA9554APW
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 PCA9554APW

Part No.:: PCA9554APW

Manufacturer:: Texas Instruments

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

Datasheet:: PCA9554APW.pdf

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

In Stock:: 2002

Quantity:: Add To Cart

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PCA9554APW Specifications

Package/Case:
16-TSSOP (0.173, 4.40mm Width)
Packaging:
Tube
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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PCA9554APW information

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PCA9554APW Typical application Circuitry

PCA9554APW

The PCA9554APW is an 8-bit I²C-bus and SMBus I/O port with interrupt, primarily designed for providing additional input/output (I/O) lines to a microcontroller with I²C-bus interface.

Features of PCA9554APW

1. I/O Expansion: The PCA9554APW offers 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 has an interrupt output, enabling the device to signal the microcontroller when input changes occur.

3. Communication Interface: Comes 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: Server Management System

In a server management system, the PCA9554APW can be used to monitor the status of various server components such as power supplies, fans, or temperature sensors. Here's a detailed connection guide for this application:

Circuit Connection Details

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

- Chip Powering: Connect a stable power source to VDD (Pin 16) to power the PCA9554APW. Ground VSS (Pin 8) to complete the power circuit.

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

- Component Status Monitoring: Connect server component indicators (like LED indicators of power supplies or fans) to the I/O ports (P0-P7). The design of the server management system and the components under observation will determine the precise configuration.

3. I²C 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 PCA9554APW and the microcontroller for status updates.

4. Interrupt Configuration (INT - Pin 13):

- Status Change Notification: Connect INT (Pin 13) to an interrupt pin on the microcontroller. This enables the PCA9554APW to alert the microcontroller when any input state changes.

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

- I²C Address Setting: 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 PCA9554APW, consider the following:

1. I/O Pin Requirements: Ensure the number of I/O pins needed for monitoring the server components does not exceed the 8-bit limit of the PCA9554APW.

2. I²C Bus Addressing: Properly address the PCA9554APW, 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 addressing these points and leveraging the features and pin configurations of the PCA9554APW, one can effectively integrate this I/O expander into sophisticated applications like a server management system. The PCA9554APW, with its I/O expansion and interrupt signaling capabilities, is an excellent choice for enhancing the monitoring capabilities of a central microcontroller in complex systems.

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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 PCA9554APW.

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