Texas Instruments

PCA9538DBR  

I/O Expanders

PCA9538DBR Description

The PCA9538DBR is a programmable I/O expander designed for use with I2C-bus and SMBus applications. Manufactured by Texas Instruments, this interface IC chip offers a robust solution for expanding the number of available I/O lines in embedded systems. The PCA9538DBR features 8 I/O lines, which can be individually configured as inputs or outputs, providing flexibility in system design. It operates within a supply voltage range of 2.3V to 5.5V and supports a clock frequency of up to 400 kHz, making it suitable for a wide range of applications that require efficient data transfer.

The PCA9538DBR is designed for surface-mount applications and comes in a 16-lead small outline package (SSOP). It includes an interrupt output feature, which allows for efficient handling of I/O events without constant polling. The chip also features a power-on reset (POR) function, ensuring reliable initialization and operation. The PCA9538DBR supports both I2C and SMBus interfaces, providing compatibility with various communication protocols.

PCA9538DBR Features

• Programmable I/O Lines: The PCA9538DBR offers 8 programmable I/O lines that can be individually configured as inputs or outputs, providing flexibility in system design.
• Wide Voltage Range: The chip operates within a supply voltage range of 2.3V to 5.5V, making it suitable for a variety of power supply configurations.
• High-Speed Communication: With a clock frequency of up to 400 kHz, the PCA9538DBR supports fast data transfer rates, ensuring efficient communication in embedded systems.
• Interrupt Output: The interrupt output feature allows for efficient handling of I/O events without the need for constant polling, improving system performance.
• Power-On Reset (POR): The PCA9538DBR includes a POR function, ensuring reliable initialization and operation.
• Dual Interface Compatibility: The chip supports both I2C and SMBus interfaces, providing compatibility with various communication protocols.
• Surface-Mount Packaging: The PCA9538DBR is designed for surface-mount applications, making it suitable for compact and high-density designs.
• Compliance and Safety: The PCA9538DBR is REACH unaffected and RoHS3 compliant, ensuring it meets environmental and safety standards.

PCA9538DBR Applications

The PCA9538DBR is ideal for applications requiring I/O expansion in embedded systems. Its compatibility with I2C and SMBus interfaces makes it suitable for a wide range of applications, including:

• Embedded Systems: Expanding the number of I/O lines in microcontroller-based systems.
• Industrial Automation: Controlling and monitoring I/O lines in industrial control systems.
• Consumer Electronics: Managing multiple I/O lines in consumer devices such as smart home controllers and IoT devices.
• Telecommunications: Expanding I/O capabilities in communication equipment and network devices.

Conclusion of PCA9538DBR

The PCA9538DBR from Texas Instruments is a versatile I/O expander that offers significant benefits for embedded system designers. Its wide voltage range, high-speed communication capabilities, and flexible I/O configuration make it an ideal solution for a variety of applications. The inclusion of an interrupt output and power-on reset function further enhances its reliability and performance. While the PCA9538DBR is now considered obsolete, it remains a valuable component for existing designs and legacy systems. For new projects, designers may consider exploring updated alternatives from Texas Instruments that build upon the PCA9538DBR's robust foundation.

PCA9538DBR Documents

Download datasheets and manufacturer documentation for PCA9538DBR

EOL :

Product Discontinuation Notification (PDF)      

Images :

Mechanical Outline Drawing      

Product Catalogs :

I2C Guide (Rev. E)       Logic Guide (Rev. AB)