PCA9534PW,118

I/o Expanders Overview

The PCA9534PW,118 is an 8-bit I2C-bus and SMBus low power I/O port with interrupt manufactured by NXP Semiconductors. It provides General Purpose parallel Input/Output (GPIO) expansion for I2C-bus/SMBus applications in a TSSOP16 package. The device operates within a supply voltage range of 2.3 V to 5.5 V and supports clock frequencies up to 400 kHz. It features 5 V tolerant I/Os, an active LOW open-drain interrupt output, and individual I/O configuration via registers. The part includes noise filters on SCL/SDA inputs, internal power-on reset, and ESD protection exceeding 2000 V HBM.

I/o Expanders Feature Summary

• Provides 8 bits of GPIO expansion compatible with I2C-bus and SMBus protocols
• Features an active LOW open-drain interrupt output triggered by input state changes
• Includes a polarity inversion register to invert input data logic levels
• Offers hardware selectable I2C addresses using three address pins

I/o Expanders Applications

• ACPI power switches
• Sensors
• Push buttons
• LEDs
• Fans

I/o Expanders Procurement Notes

Verify the specific ordering suffix '118' corresponds to the reel packing method as documented in the official NXP datasheet. Confirm that the TSSOP16 package variant matches the required board layout dimensions. Ensure the component meets the specified RoHS compliance standards for the target application environment.

I/o Expanders Selection Notes

Select this component when low standby current is critical, as it lacks internal I/O pull-up resistors unlike the PCA9554. It serves as a pin-to-pin and address-compatible alternative to the PCF8574 series, though software modifications are necessary due to enhanced features. Consider the 5 V I/O tolerance for interfacing with higher voltage subsystems.

I/o Expanders Part Context

The PCA9534 is part of the NXP Semiconductors family of I2C-bus I/O expanders. It was developed to enhance previous models by offering higher drive capability, lower supply current, and smaller packaging options including SO16, TSSOP16, and HVQFN16 variants. The PW suffix specifically denotes the TSSOP16 plastic thin shrink small outline package.

I/o Expanders Replacement Considerations

The PCA9534 is identical to the PCA9554 except for the removal of internal I/O pull-up resistors. It is pin-to-pin and I2C-bus address compatible with the PCF8574 series, but requires software changes due to architectural enhancements.