SCH3116I-NU

Specialized Overview

The SCH3116I-NU is a Super I/O controller manufactured by Microchip Technology, designed for industrial applications with an operating temperature range of -40°C to +85°C. It operates at 3.3V with a 5V-tolerant SIO block and features a Low Pin Count (LPC) interface supporting frequencies from 19MHz to 33MHz. The device integrates 40 General Purpose I/O pins, six GPIOs with VID-compatible inputs, and comprehensive hardware monitoring capabilities including voltage, temperature, and fan speed control. Communication interfaces include four full-function serial ports, two four-pin serial ports, an infrared port, and a multi-mode parallel port. Legacy support includes an 8042 keyboard/mouse controller and a CMOS 765B floppy disk controller.

Specialized Feature Summary

• Integrated Hardware Monitor with programmable automatic fan control and thermal trip signaling
• Full legacy Super I/O functionality including 8042 keyboard controller and IEEE 1284 parallel port
• Multiple high-speed serial communication options with NS16550A compatible UARTs
• Enhanced security features including a 32-byte Security Key Register for device authentication

Specialized Applications

• Industrial PC motherboard design requiring robust environmental monitoring
• Embedded systems needing integrated legacy peripheral support such as serial and parallel ports
• Hardware management controllers for server or workstation platforms
• IoT gateways utilizing multiple serial interfaces and GPIO expansion

Specialized Procurement Notes

Verify the specific suffix 'I' confirms the industrial temperature rating (-40°C to +85°C) rather than commercial variants. Confirm package type matches the 128-pin VTQFP specification. Check current availability status as distribution channels may vary for discontinued or end-of-life components. Ensure RoHS compliance documentation aligns with project requirements.

Specialized Selection Notes

Select this component when LPC bus connectivity is required alongside extensive legacy I/O integration. Compare against SCH3112 and SCH3114 models based on the specific need for four full-function plus two four-pin serial ports. Evaluate hardware monitoring needs against the available analog inputs and PWM outputs. Consider the 128-pin VTQFP package constraints for PCB layout and thermal management in industrial enclosures.

Specialized Part Context

This part belongs to the SCH3112/SCH3114/SCH3116 product family of Super I/O controllers. The SCH3116 variant specifically distinguishes itself by offering six total serial ports, whereas the SCH3112 provides two and the SCH3114 provides four. All family members share the same LPC interface, hardware monitor block, and general-purpose I/O architecture within the 128-pin VTQFP package.

Specialized Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Verify compatibility with existing BIOS/UEFI implementations if replacing legacy SMSC-derived parts.