MCP23016-I/SO

I/o Expanders Overview

The MCP23016-I/SO is a 16-bit I/O expander from Microchip Technology, housed in a 28-pin SOIC package. It provides parallel I/O expansion for I²C bus applications with a supply voltage range of 2.0V to 5.5V and an operating temperature range of -40°C to +85°C. The device supports Fast I²C clock frequencies up to 400 kbits/s and features three hardware address pins (A0-A2) allowing up to eight devices on the same bus. Each I/O pin offers high-current drive capability of ±25 mA. Key registers include GP0/GP1 for data, OLAT0/OLAT1 for output latches, IODIR0/IODIR1 for direction control, IPOL0/IPOL1 for polarity inversion, and INTCAP0/INTCAP1 for interrupt capture.

I/o Expanders Feature Summary

• Provides 16-bit remote bidirectional I/O port expansion via I²C interface
• Features open-drain interrupt output that activates upon input state changes
• Includes internal Power-On Reset (POR) and configurable input polarity registers
• Supports up to eight devices on a single I²C bus using hardware address pins

I/o Expanders Applications

• ACPI power switch control
• Sensor interface expansion
• Push button matrix scanning
• LED indicator arrays

I/o Expanders Procurement Notes

Verify the suffix 'SO' confirms the 28-pin Small Outline Integrated Circuit package. Confirm the 'I' designation matches the required industrial temperature range of -40°C to +85°C. Ensure the I²C address configuration via A0-A2 pins aligns with system bus requirements. Check datasheet DS20090C for specific electrical characteristics and timing parameters relevant to the target application voltage.

I/o Expanders Selection Notes

Select this component when 16 additional general-purpose I/O lines are needed for microcontrollers with limited pins. It is suitable for systems requiring high-current sink/source per pin (±25 mA). Consider the external RC circuit requirement for the CLK pin to generate the internal clock. Verify compatibility with the host controller's I²C voltage levels and supported clock speeds up to 400 kHz.

I/o Expanders Part Context

The MCP23016 is part of the MCP230xx series of I/O expanders designed for I²C bus applications. It complements other variants like the MCP23008 (8-bit) and MCP23017 (16-bit with different interface). The 'I/SO' variant specifically denotes the industrial temperature grade and surface-mount SOIC packaging, distinguishing it from PDIP or QFN options within the same functional family.

I/o Expanders Replacement Considerations

MCP23016T-I/ML: Same functionality in QFN-28 package. MCP23016-I/SP: Same functionality in SPDIP-28 package. MCP23017: Similar 16-bit expansion but uses different addressing and register map.