MCP23016T-I/ML

I/o Expanders Overview

The MCP23016T-I/ML is a 16-bit I/O expander manufactured by Microchip Technology, designed for I2C bus applications. It features 16 bidirectional general-purpose I/O pins that default to inputs upon power-on reset. The device supports fast I2C clock frequencies up to 400 kHz and allows up to eight devices on the same bus via three hardware address pins. Operating supply voltage ranges from 2.0 V to 5.5 V, with an industrial temperature range of -40°C to +85°C. It includes high-current drive capability per I/O pin of ±25 mA, an open-drain interrupt output for input changes, and internal registers for polarity inversion and direction control.

I/o Expanders Feature Summary

• Provides 16-bit remote bidirectional I/O expansion through a serial I2C interface.
• Features an open-drain interrupt output that activates when any input state differs from its corresponding port register.
• Includes an interrupt capture register to store port values at the time of an interrupt event.
• Supports up to eight devices on a single I2C bus using three hardware address pins.

I/o Expanders Applications

• ACPI systems requiring additional I/O capabilities
• Power switch control interfaces
• Sensor data acquisition nodes
• Push button scanning arrays
• LED matrix driving circuits

I/o Expanders Procurement Notes

Verify the specific ordering suffix 'I/ML' corresponds to the QFN-28 package and industrial temperature grade (-40°C to +85°C). Confirm the datasheet revision matches the required design specifications. Ensure the I2C bus timing parameters align with the master controller's capabilities. Check for moisture sensitivity levels if reflow soldering is planned.

I/o Expanders Selection Notes

Select this component when a microcontroller requires expanded GPIO without dedicated parallel ports. The I2C interface minimizes pin usage to two lines (SCL/SDA). Consider the ±25 mA drive current for direct LED or relay interfacing. Verify that the operating voltage range (2.0V to 5.5V) matches the system logic levels. The QFN package is suitable for space-constrained PCB layouts.

I/o Expanders Part Context

The MCP23016 belongs to Microchip's family of 16-bit I/O expanders. It complements other interface ICs by providing simple parallel-to-serial conversion for GPIO. The device is often used in conjunction with PIC, AVR, or ARM microcontrollers to extend system connectivity. Its low standby current and CMOS technology make it efficient for battery-powered applications.

I/o Expanders Replacement Considerations

Direct pin-compatible replacements within the same package may be limited. Other Microchip expanders like the MCP23017 offer similar functionality but with different pinouts or additional features such as SPI interface. Verify register compatibility and electrical characteristics before substituting.