MICROCHIP 16-Bit I/O Expander SMD SSOP28

The MICROCHIP 16-Bit I/O Expander is designed for I²C bus applications, providing a simple solution when additional I/Os are required. This device features high-current drive capability alongside low supply current and individual I/O configuration.

It consists of multiple 8-bit configuration registers for input, output, and polarity selection. The system master can enable the I/Os as either inputs or outputs by writing the I/O configuration bits. The data for each input or output is kept in the corresponding register. An open-drain interrupt output is activated when any input state differs from its corresponding input port register state, indicating to the system master that an input state has changed. The interrupt capture register captures the port value at this time. A power-on reset sets the registers to their default values and initializes the device state machine.

Key Features

• Three hardware address pins allow the use of up to eight devices
• Open-drain interrupt output on input change
• Interrupt port capture register
• Internal power-on reset (POR)
• Polarity inversion register to configure the polarity of the input port data
• Compatible with most microcontrollers
• ±25mA high-current drive capability per I/O
• CMOS technology

This expander is suitable for a wide range of applications, including ACPI, power switches, sensors, push buttons, and LEDs. It operates on a supply voltage from 2V to 5.5V and comes in an SSOP package with 28 pins. The device dimensions are 43 mm in height, 33 mm in width, and 15 mm in depth, with a weight of 0.426 grams.