COM-15099

Overview

The SparkFun COM-15099 is an I/O expander module based on the MCP23008 integrated circuit. It provides eight general-purpose digital input/output pins accessible via a two-wire I2C interface, allowing expansion of microcontroller resources without consuming additional dedicated pins. The device operates within a supply voltage range of 1.8V to 5.5V, ensuring compatibility with both 3.3V and 5V logic systems. It supports a clock frequency of up to 1.7 MHz and features open-drain outputs capable of sourcing or sinking up to 20mA per pin, suitable for driving LEDs and other low-power loads.

Feature Summary

• Expands microcontroller capabilities by providing eight additional digital I/O lines through a standard two-wire I2C communication protocol.
• Operates across a wide voltage range from 1.8V to 5.5V, supporting integration into various logic level environments.
• Features open-drain output configuration with sufficient current drive capability for direct connection to indicators like LEDs.

Applications

• Adding digital inputs or outputs to microcontrollers with limited available pins
• Driving LED arrays or status indicators in embedded projects
• Interfacing with sensors or actuators requiring simple digital control signals

Procurement Notes

Verify that the specific revision of the COM-15099 matches your design requirements regarding package type and pinout. Confirm that the I2C address settings align with your system architecture to avoid bus conflicts. Ensure power supply decoupling is implemented according to the MCP23008 datasheet recommendations for stable operation at the specified clock frequencies.

Selection Notes

Select this module when project constraints require expanding digital I/O capacity using the I2C bus rather than SPI or parallel interfaces. It is appropriate for designs needing moderate current drive on individual pins while maintaining a minimal footprint. Consider the 1.7 MHz speed limit if high-frequency switching is required, as it may be insufficient for very fast data acquisition applications.

Part Context

This component is part of SparkFun's accessory line designed to facilitate rapid prototyping and development. It serves as a breakout board for the MCP2008 chip, simplifying integration into breadboard-based or custom PCB projects. The module bridges the gap between complex IC packaging and user-friendly development environments, targeting hobbyists and engineers building IoT or automation systems.

Replacement Considerations

Direct functional substitutes include other MCP23008-based modules from different manufacturers. Generic DIP or SOIC packages of the MCP23008 IC can replace the module if custom PCB design is preferred. Ensure any replacement maintains the same I2C addressing scheme and voltage tolerance levels for seamless integration.