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Name: PCA9538PWR
Brand: Texas Instruments
SKU: PCA9538PWR
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 PCA9538PWR

Part No.:: PCA9538PWR

Manufacturer:: Texas Instruments

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

Datasheet:: PCA9538PWR.pdf

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

In Stock:: 3562

Quantity:: Add To Cart

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PCA9538PWR Specifications

Package/Case:
16-TSSOP (0.173, 4.40mm Width)
Packaging:
Tape & Reel (TR),Cut Tape (CT),Digi-Reel®,Bulk
Series:
-
ProductStatus:
Active
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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PCA9538PWR information

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PCA9538PWR Typical application Circuitry

PCA9538PWR

An 8-bit General Purpose Input/Output (GPIO) expander with interrupt and reset capabilities for IC-bus and SMBus applications is the PCA9538PWR, which operates at low voltage. It's particularly useful in systems where additional I/O ports are needed without requiring an increase in microcontroller pin count.

Features of PCA9538PWR

1. I/O Expansion: The PCA9538PWR provides 8 additional I/O ports, which can be individually configured as input or output.

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

3. Reset Function: Includes a hardware reset input, allowing the device to be reset without powering down the system.

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

Application Scenario: Smart Home Lighting System

In a smart home lighting system, the PCA9538PWR can be used to manage multiple light switches and sensors, thereby expanding the I/O capability of the central home automation controller. This application has a comprehensive connection tutorial available here:

Circuit Connection Details

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

- Chip Powering: Power the PCA9538PWR by connecting a reliable power supply to Pin 16 (VDD). Complete the power circuit by grounding VSS (Pin 8).

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

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

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

- Home Automation Controller Communication: Connect SDA (Pin 15) and SCL (Pin 14) to the I²C data and clock lines on the home automation controller. This setup facilitates communication between the PCA9538PWR and the controller.

4. Interrupt Configuration (INT - Pin 13):

- Input Change Notification: Connect INT (Pin 13) to an interrupt pin on the home automation controller. This enables the PCA9538PWR to alert the controller when any input state changes.

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

- I²C Address Customization: Set A0, A1, and A2 (Pins 10-12) to determine the I²C address. This is crucial when multiple devices are connected to the same I²C bus.

6. Hardware Reset (RESET - Pin 11):

- Resetting the Device: Connect RESET (Pin 11) to a reset control line or to a manual switch to allow hardware resetting of the PCA9538PWR if needed.

Design Considerations

When designing a circuit with the PCA9538PWR, consider the following:

1. I/O Pin Capacity: Ensure that the number of I/O pins needed for the switches and sensors does not exceed the 8-bit limit of the PCA9538PWR.

2. I²C Bus Configuration: Properly configure the address of the PCA9538PWR, 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 home automation controller can promptly respond to changes in the input states.

5. Reset Functionality: Ensure the reset functionality is accessible and operates correctly to allow for system troubleshooting or maintenance without requiring a full system power cycle.

By carefully addressing these points and utilizing the functionalities and pin configurations of the PCA9538PWR, one can effectively integrate this I/O expander into sophisticated applications like a smart home lighting system. The PCA9538PWR, with its I/O expansion, interrupt, and reset functionalities, is an excellent choice for enhancing the I/O capabilities of a central home automation controller 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 PCA9538PWR.

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