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PCA9538PW from NXP,NXP Semiconductors

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PCA9538PW

Manufacturer: NXP, TI, PHI

8-bit I虏C-bus and SMBus low power I/O port with interrupt and reset

Partnumber Manufacturer Quantity Availability
PCA9538PW NXP, TI, PHI 1281 In Stock

Description and Introduction

8-bit I虏C-bus and SMBus low power I/O port with interrupt and reset The **PCA9538PW** from Philips is a versatile **I²C-bus controlled 8-bit I/O expander** designed to enhance the input/output capabilities of microcontrollers and other digital systems. This low-voltage device operates within a **1.65V to 5.5V** range, making it suitable for a wide variety of applications, including industrial controls, consumer electronics, and embedded systems.  

Featuring **8 programmable GPIO pins**, the PCA9538PW can be configured as either inputs or outputs via the I²C interface, providing flexibility in system design. Each pin includes **internal pull-up resistors**, simplifying circuit design by reducing external component requirements. The device supports **interrupt functionality**, allowing efficient monitoring of input changes without continuous polling.  

With a **400kHz I²C-bus interface**, the PCA9538PW ensures fast and reliable communication while maintaining low power consumption. Its compact **TSSOP-16 package** makes it ideal for space-constrained applications. Additionally, the device offers **hot insertion** capability, ensuring stable operation in dynamic environments.  

Engineers favor the PCA9538PW for its **ease of integration**, robust performance, and compatibility with standard I²C protocols. Whether expanding I/O for sensors, switches, or LED control, this component delivers a reliable solution for modern digital systems.

Application Scenarios & Design Considerations

8-bit I虏C-bus and SMBus low power I/O port with interrupt and reset

Alternative Part Number

  • TCA9538PW --: Pin-compatible I2C 8-bit I/O expander from TI's TCA series, direct functional equivalent to PCA9538 with similar register map and package.
  • PCF8574T --: Widely available I2C 8-bit I/O expander in the same NXP family, simpler feature set but often used as a drop-in for basic GPIO expansion applications.
  • MAX7311AUG --: I2C 16-bit I/O expander offering more I/O than the original; suitable when extra ports are acceptable and I2C expander functionality is the key requirement.
  • PCF8574APW --: Widely available I2C 8-bit I/O expander in TSSOP package with comparable functionality, though register map differs slightly.
  • MAX7311AUI+ --: I2C 16-port I/O expander offering similar expander functionality; requires minor firmware adaptation but is a viable alternative.
  • PCF8574AT --: Widely available I2C 8-bit I/O expander in SOIC package, similar function and interface though with simpler feature set and different register layout.

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