Microchip 16-Bit I/O Expander IC SSOP-28 I2C Interface

The Microchip 16-Bit I/O Expander IC in an SSOP-28 package provides 16 configurable bidirectional I/O pins for microcontroller and system designs that need additional input and output capacity. It communicates over an industry-standard I2C serial interface with a clock frequency of up to 1.7 MHz.

Overview

The device offers a remote bidirectional I/O port solution that supports efficient data transfer and straightforward integration into digital circuits. All 16 I/O pins default to an input state at power-up, which supports system safety. Each pin can be individually configured as an input or output.

Key Features

• Three hardware address pins allow up to eight identical devices to share the same I2C bus without address conflicts.
• Output drivers can be set as active-high, active-low, or open-drain to suit different logic level requirements and to drive external components.
• Two independent interrupt outputs, INTA and INTB, can operate separately or be logically combined.
• Interrupt-on-change capability is triggered by pin state changes or deviations from pre-configured default register values, reducing the need for constant microcontroller polling.
• A polarity inversion register allows the logical polarity of input port data to be inverted, simplifying interface design with active-low signals.
• An external reset input supports reliable system initialisation.

Operating Conditions

The device operates from a supply voltage range of 1.8 V to 5.5 V and across an industrial temperature range of -40 °C to +85 °C. Its maximum standby current of 1 µA makes it suitable for power-sensitive applications.

Choose the Microchip 16-Bit I/O Expander IC when your design requires additional I/O pins with I2C control, interrupt management, and flexible output configuration.