Texas Instruments PCA9535 Remote 16-Bit I2C and SMBus, Low-Power I/O Expander With Interrupt Output and Config Registers PCA9535PWG4

The PCA9535PWG4 is a 16-bit I/O expander designed for I¬=C and SMBus interfaces, operating within a voltage range of 2.3 V to 5.5 V. It features low standby current consumption of 1 OºA maximum and supports a 400-kHz fast I¬=C bus. The device allows for the connection of up to eight PCA9535 devices on the same bus through three hardware address pins (A0, A1, A2). The PCA9535 includes two 8-bit configuration registers for input or output selection, as well as input and output port registers. It also has a polarity inversion register to manage active-high or active-low operations. The open-drain interrupt output signals changes in input states, enabling efficient communication with a microcontroller without continuous I¬=C bus activity. The device is capable of driving LEDs directly due to its high-current output capability and is compatible with most microcontroller families. It also offers robust ESD protection and latch-up performance, making it suitable for various applications requiring reliable I/O expansion.