LPC47M112-MW Microchip Super I/O Controller: Datasheet and Application Overview

The LPC47M112-MW from Microchip Technology represents a highly integrated Super I/O controller designed to provide a comprehensive suite of legacy I/O functions for modern computing systems. As a key component in embedded systems, industrial PCs, and server management platforms, this controller bridges the gap between low-speed peripherals and the high-speed core logic of a motherboard. Its primary role is to consolidate numerous discrete components into a single, cost-effective, and power-efficient package, simplifying board design and improving overall system reliability.

Core Features and Architectural Overview

At its heart, the LPC47M112-MW is built around the Low Pin Count (LPC) bus interface, which serves as its primary connection to the host southbridge or Platform Controller Hub (PCH). This bus is instrumental in handling data transfers for legacy I/O functions with high efficiency and low pin count.

The controller integrates a multitude of critical functions, including:

Two high-performance UARTs: These serial ports provide full legacy support for serial communication devices, often used for console redirection, modem connectivity, or industrial equipment interfacing. One UART can be configured for Infrared (IrDA) communication.

Flexible Parallel Port: Supports Standard, Bi-Directional, EPP, and ECP modes, offering compatibility with a wide range of legacy printers and specialized hardware.

Keyboard Controller (KBC) and PS/2 Mouse Interface: Provides the essential interface for legacy PS/2-style keyboards and mice, a crucial feature for many embedded and industrial applications.

Integrated Floppy Disk Controller (FDC): Manages communication with legacy floppy disk drives, which are still used in some specific industrial and legacy upgrade scenarios.

General Purpose I/O (GPIO) Pins: Offer system designers additional flexibility for custom control and sensing functions, such as monitoring system status or controlling LEDs.

A significant aspect of the LPC47M112-MW is its advanced power management support. It is fully compatible with the ACPI (Advanced Configuration and Power Interface) specification, enabling features like system sleep states (e.g., S3, S4, S5) and wake-up events from peripherals like the keyboard, mouse, or ring indicator on a UART. This makes it ideal for energy-conscious applications.

Key Datasheet Specifications

System designers rely on the datasheet for critical operational parameters:

Supply Voltage: Operates from a 3.3V core supply, with 5V tolerance on many I/O pins, ensuring compatibility with older peripheral voltages.

Packaging: Offered in a 100-pin MQFP (Micro Quad Flat Pack) package, suitable for automated PCB assembly.

Operating Temperature: Typically specified for the commercial (0°C to +70°C) or industrial (-40°C to +85°C) range, catering to a broad spectrum of deployment environments.

Interrupt and DMA Management: Features sophisticated shared interrupt and DMA channel management to resolve conflicts and ensure reliable operation of all connected peripherals.

Primary Application Areas

The LPC47M112-MW finds its purpose in systems where backward compatibility and legacy support are non-negotiable. Its primary applications include:

Server Management: Acting as a BMC (Baseboard Management Controller) companion chip, it provides the vital serial port for IPMI (Intelligent Platform Management Interface) SOL (Serial Over LAN) console redirection, a fundamental feature for remote server management and diagnostics.

Industrial PCs and Embedded Systems: In these fields, longevity of component supply and support for legacy industrial peripherals (serial-based sensors, printers, etc.) are paramount. The integration offered by this Super I/O chip reduces board space and design complexity.

Point-of-Sale (POS) Terminals and Kiosks: Often require multiple serial ports to connect barcode scanners, receipt printers, cash drawers, and customer displays, all of which are capably handled by this controller.

Legacy System Upgrades: Used in designs that require modern motherboards to maintain support for older peripheral standards.

ICGOOODFIND

The LPC47M112-MW Super I/O controller is a robust and highly integrated solution that masterfully consolidates critical legacy I/O functions. Its strong support for the LPC bus, comprehensive feature set including multiple UARTs and parallel port, and advanced power management capabilities make it an indispensable component for developers of server, industrial, and embedded systems where reliability and legacy interoperability are critical design constraints.

Keywords:

Super I/O Controller, LPC Bus, Legacy I/O, UART, Power Management