PCA9534PW/DG,118

I/o Expanders Overview

The PCA9534PW/DG,118 is an 8-bit I2C-bus and SMBus low power I/O port with interrupt manufactured by NXP USA Inc. It provides General Purpose parallel Input/Output (GPIO) expansion for I2C-bus/SMBus applications. 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 interrupt output, and noise filters on SCL/SDA inputs. The component is housed in a TSSOP16 package and functions across an ambient temperature range of -40 °C to +85 °C.

I/o Expanders Feature Summary

• Provides 8 bits of General Purpose parallel Input/Output (GPIO) expansion compatible with I2C-bus and SMBus protocols.
• Features an open-drain interrupt output that activates when any input state differs from its corresponding input port register state.
• Includes hardware-selectable address pins (A0, A1, A2) allowing up to eight devices to share the same I2C-bus or SMBus.
• Incorporates internal power-on reset functionality and noise filters on serial data lines to prevent glitches during power-up.

I/o Expanders Applications

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

I/o Expanders Procurement Notes

Verify the specific ordering suffix ',118' against official documentation to confirm reel packaging specifications. Ensure the TSSOP16 package variant matches your board layout requirements. Cross-reference the manufacturer part number with authorized distributors to validate authenticity and current availability status before procurement.

I/o Expanders Selection Notes

Select this component when 8-bit GPIO expansion via I2C is required with low standby current consumption. It is suitable for designs needing 5 V I/O tolerance while operating at lower supply voltages. Consider the TSSOP16 package dimensions for space-constrained PCB layouts requiring surface mount technology.

I/o Expanders Part Context

This component belongs to the PCA9534 series of I/O expanders developed to enhance the NXP Semiconductors family of I2C-bus I/O expanders. It shares pin-to-pin and I2C-bus address compatibility with the PCF8574 series but requires software changes due to architectural enhancements such as individual I/O configuration and polarity inversion registers.

I/o Expanders Replacement Considerations

PCA9534D,118

I/o Expanders FAQ

How does the PCA9534 differ from the PCA9554?

The PCA9534 is identical to the PCA9554 except for the removal of the internal I/O pull-up resistor, which greatly reduces power consumption when the I/Os are held LOW.

What is the default state of the I/O pins upon power-on reset?

At reset, all I/Os are configured as inputs with high-impedance output drivers, and the registers return to their default values.

How is the interrupt output deactivated?

The open-drain interrupt output is deactivated when the input returns to its previous state or when the Input Port register is read by the system master.