PCA9534D,518

I/o Expanders Overview

The PCA9534D,518 is an 8-bit I2C-bus and SMBus low-power I/O expander manufactured by NXP USA Inc. It provides general-purpose parallel input/output expansion for I2C 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 an active LOW interrupt output, polarity inversion register, and noise filters on SCL/SDA inputs. The component is housed in a 16-lead SO16 plastic small outline package (SOT162-1) and functions across an ambient temperature range of -40 °C to +85 °C.

I/o Expanders Feature Summary

• Provides 8-bit I2C-bus GPIO expansion with individual I/O configuration capabilities.
• Features an open-drain interrupt output activated when any input state differs from its corresponding input port register state.
• Includes a polarity inversion register to invert the polarity of Input Port register data.
• Offers 5 V tolerant I/Os and internal power-on reset functionality.

I/o Expanders Applications

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

I/o Expanders Procurement Notes

Verify that the ordering suffix matches the required packaging format. The specified part number indicates reel packing with standard marking. Confirm the minimum order quantity aligns with production requirements. Ensure the temperature rating meets the operational environment specifications before finalizing procurement orders.

I/o Expanders Selection Notes

Select this component when 8-bit I/O expansion via I2C is required. It serves as a pin-to-pin compatible alternative to the PCF8574 series, though software changes are necessary due to enhanced features. Consider the removal of internal pull-up resistors compared to the PCA9554 if lower power consumption is critical when I/Os are held LOW.

I/o Expanders Part Context

This component belongs to the PCA9534 family of I/O expanders developed to enhance the Philips/NXP family of I2C I/O expanders. Improvements include higher drive capability, 5V I/O tolerance, lower supply current, and smaller packaging options including SO16, TSSOP16, and HVQFN16 variants.

I/o Expanders Replacement Considerations

PCA9534D,112

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 reduces power consumption when the I/Os are held LOW.

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

At power-on reset, all I/O pins are configured as inputs by default.

Can multiple PCA9534 devices share the same I2C bus?

Yes, three hardware pins (A0, A1, A2) vary the fixed I2C-bus address, allowing up to eight devices to share the same I2C-bus/SMBus.