PCA9534PW,112

I/o Expanders Overview

The PCA9534PW,112 is an 8-bit I/O expander in a TSSOP16 package. It operates on a supply voltage of 2.3 V to 5.5 V with a maximum clock frequency of 400 kHz. The device provides 8 general-purpose parallel I/O pins and features an active LOW interrupt output. It includes configuration registers for input/output selection, polarity inversion, and power-on reset functionality.

I/o Expanders Feature Summary

• Provides 8 bits of General Purpose parallel Input/Output expansion for I2C-bus/SMBus applications
• Features an open-drain interrupt output activated when any input state differs from its corresponding register state
• Includes hardware selectable address pins (A0, A1, A2) allowing up to eight devices to share the same bus

I/o Expanders Applications

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

I/o Expanders Procurement Notes

Verify the datasheet revision matches Rev. 4 dated 7 November 2017. Confirm the ordering suffix '112' corresponds to the standard marking tube packing method as specified in the ordering information table. Ensure the manufacturer is identified as NXP Semiconductors.

I/o Expanders Selection Notes

Select this component when 8-bit GPIO expansion is required with low standby current. It is suitable for designs needing 5 V I/O tolerance and individual I/O configuration. Consider it over the PCA9554 if internal pull-up resistors are not needed to reduce power consumption.

I/o Expanders Part Context

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

I/o Expanders Replacement Considerations

PCA9554PW,112: Identical function but includes internal I/O pull-up resistors.