Microchip MCP23016 16-Bit I/O Expander IC DIP28

The Microchip MCP23016 16-Bit I/O Expander IC provides 16 programmable bi-directional I/O pins for I²C and SMBus compatible applications.

The MCP23016 adds general-purpose parallel input and output expansion to microcontroller-based systems. It supports integration with peripherals such as sensors, push buttons, LEDs, power switches, and ACPI controls, making it suitable for designs that need additional I/O ports beyond those available on the host microcontroller.

Key Features

• 16 programmable bi-directional I/O pins
• Each pin can source or sink up to 25 mA, allowing direct drive of LEDs
• Simple I²C interface operating at clock frequencies from 0 to 400 kHz
• Three hardware address pins support up to eight devices on the same bus
• Polarity inversion register for configuring input port data polarity
• Open-drain interrupt output that activates when an input pin changes state
• Internal power-on reset (POR)
• Operating voltage from 2 V to 5.5 V
• Operating temperature range from -40°C to +85°C

Physical Specifications

• Package: Standard 28-pin SPDIP (Shrink Plastic Dual In-line Package)
• Width: 3.3
• Depth: 1.5
• Height: 4.3
• Weight: 6.669 gm

Applications

The interrupt output reduces the need for continuous polling by the host processor, which is useful in systems that monitor changes on input pins. The expander can be used to add input and output capacity for sensors, push buttons, LEDs, power switches, and ACPI control signals. Its drive capability of up to 25 mA per pin allows LEDs and relays to be driven without additional driver circuits.

The two-wire I²C interface and 28-pin SPDIP package provide a straightforward way to add parallel input and output capacity to a microcontroller-based design.