NXP PCA9534 8-Bit I2C GPIO Expander 400kHz TSSOP

The NXP PCA9534 is a 16-pin CMOS device that provides 8 bits of general-purpose parallel input/output (GPIO) expansion for I2C-bus and SMBus applications. It enhances NXP's family of I2C-bus I/O expanders with improved capabilities, including higher drive, 5V I/O tolerance, lower supply current, individual I/O configuration, a 400kHz clock frequency, and a compact TSSOP package.

This I/O expander offers a simple solution when additional I/O is needed for ACPI power switches, sensors, push buttons, LEDs, fans, and more. It features a polarity inversion register, an active LOW interrupt output, and low standby current for efficient operation. The device includes a noise filter on SCL/SDA inputs, ensuring clean communication, and is designed to avoid glitches on power-up with an internal power-on reset.

With eight I/O pins that default to inputs, the PCA9534 is versatile and configurable. It supports a clock frequency from 0Hz up to 400kHz, making it suitable for a wide range of applications. The supply voltage range is 2.3V to 5.5V, and it operates reliably across temperatures from -40°C to 85°C.

Key Features

• 8-bit I2C-bus/SMBus GPIO expander
• 5V tolerant I/Os
• Polarity inversion register
• Active LOW interrupt output
• Low standby current
• Noise filter on SCL/SDA inputs
• Internal power-on reset (no glitch on power up)
• 8 I/O pins default to inputs

The PCA9534 comes in a 16-pin TSSOP package and is ideal for expanding I/O capabilities in embedded systems, industrial control, and consumer electronics where reliable and flexible I/O management is essential.