SCH3112I-NU

Specialized Overview

The SCH3112I-NU is a Super I/O controller manufactured by Microchip Technology, operating at 3.3V with a 5V-tolerant SIO block. It features an LPC interface supporting frequencies of 19MHz to 33MHz and includes two full-function serial ports compatible with NS16C550A standards. The device provides 40 general-purpose I/O pins, hardware monitoring for voltage and temperature, and supports PC99/PC2001 and ACPI 2.0 compliance. It operates within an industrial temperature range of -40°C to +85°C and is housed in a 128-pin VTQFP package.

Specialized Feature Summary

• Integrated legacy functionality including an 8042-based keyboard/mouse controller and IEEE 1284 parallel port
• Hardware monitoring capabilities with programmable automatic fan control and thermal diode sensing
• Supports multiple low power-down modes through sophisticated power control circuitry
• Includes security key register for device authentication

Specialized Applications

• Industrial computing systems requiring robust environmental tolerance
• Motherboard designs needing integrated legacy I/O management
• Systems requiring hardware monitoring and automated thermal regulation

Specialized Procurement Notes

Verify the specific suffix 'I' confirms the industrial temperature rating of -40°C to +85°C. Confirm the 'NU' designation corresponds to the 128-pin VTQFP package type. Check current availability status as distribution channels may vary for discontinued or end-of-life components.

Specialized Selection Notes

Select this component when an LPC interface is required alongside legacy serial and parallel port support. Ensure the design accommodates the 128-pin VTQFP footprint. Verify that the 3.3V logic levels align with the system's main processor requirements.

Specialized Part Context

This part belongs to the SCH3112/SCH3114/SCH3116 product family. The SCH3112 variant specifically offers two full-function serial ports, whereas the SCH3114 provides four and the SCH3116 offers six. All variants share the same core architecture and package options.

Specialized Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.