PCA9539PWJ

I/o Expanders Overview

The PCA9539PWJ is a low-voltage 16-bit I²C and SMBus low-power I/O expander manufactured by Nexperia USA Inc. It provides General Purpose Input/Output (GPIO) expansion with interrupt output, reset pin, and configuration registers. The device operates within a supply voltage range of 2.3 V to 5.5 V and supports Fast-mode I²C bus communication up to 400 kHz. It features an open-drain active LOW interrupt output and an active LOW reset input. The component is housed in a TSSOP24 package (SOT355-1) and is specified for operation from -40 °C to +85 °C.

I/o Expanders Feature Summary

• Provides 16 bits of GPIO expansion with configurable input/output directions via internal configuration registers.
• Features an open-drain interrupt output that activates when any GPIO changes state relative to its input port register.
• Includes an active LOW reset pin to return the device to default values without power cycling.
• Supports hardware selectable slave addresses using two address pins to allow multiple devices on the same bus.

I/o Expanders Applications

• ACPI power switches
• Sensor interface expansion
• Push button and keypad management
• LED control systems
• Fan control circuits

I/o Expanders Procurement Notes

Verify the specific ordering suffix 'J' against the manufacturer's official documentation to confirm packaging details or tape-and-reel specifications. Ensure the selected variant matches the required temperature range and package type for the target application design.

I/o Expanders Selection Notes

Select this component when additional I/O ports are needed while minimizing interconnections. It is suitable for applications requiring low standby current consumption and compatibility with both 3.3 V and 5 V logic levels. Consider the interrupt functionality if event-driven notification is preferred over continuous polling.

I/o Expanders Part Context

The PCA9539 belongs to the family of low-voltage I/O expanders designed for I²C-bus and SMBus applications. It serves as a solution for expanding microcontroller capabilities by providing 16 programmable I/O lines through a simple serial interface, reducing the number of pins required on the main processor.

I/o Expanders Replacement Considerations

Check for direct pin-to-pin replacements such as the PCAL9538A or PCAL9539A from NXP/Nexperia, which offer enhanced flexible I/O features. Verify electrical compatibility and register mapping before substituting other manufacturers' parts like the PCA9539 variants from Texas Instruments.