General Description

The LPC47N350 is a highly integrated LPC-based ACPI 2.0 and PC2001 compliant Keyboard, System, and Power Management Controller for Notebook PC Applications. See Figure 1.1.

The LPC47N350 incorporates a high-performance 8051-based keyboard and system controller with internal 64k byte Flash ROM; a hot-plug Docking LPC port; a Serial Peripheral Interface (SPI), four PS/2 ports; a real-time clock; a 16C550A-compatible 2 pin UART for Debug Port; two 8584-style I2C/SMBus controllers with two selectable ports per controller; a Serial IRQ peripheral agent interface; an ACPI Embedded Controller Interface; forty-one General Purpose I/O pins; four independently programmable pulse width modulators; dual fan control through the implementation of two fan tachometer input pins; and maskable hardware wake-up events.

Product Features

■ 3.3V Operation with 5V Tolerant Buffers

■ ACPI 2.0 PC2001 Compliant

■ LPC Interface with Clock Run Support

— Decode I/O, Memory, and FWH cycles

— Serial IRQ Interface Compatible with Serialized IRQ Support for PCI Systems

— 15 Direct IRQs

— ACPI SCI Interface

— nSMI output and supporting PM registers

— Shadowed write only registers

■ LPC Switching

— Hot Plug LPC Docking Interface

— Secondary Switchable LPC interface (3.3V only)

■ Internal 64K Flash ROM

— Programmed From Direct Parallel Interface, 8051, or LPC Host

— 2k-Byte Lockable Boot Block

— Can be Programed Without 8051 Intervention

■ Three Power Planes

— Low Standby Current in Sleep Mode

■ ACPI Embedded Controller Interface

■ Configuration Register Set Compatible with ISA Plugand-Play Standard (Version 1.0a)

■ High-Performance Embedded 8051 Keyboard and System Controller

— Provides System Power Management

— System Watch Dog Timer (WDT)

— 8042 Style Host Interface

— Supports Interrupt and Polling Access

— 512 Bytes Executable RAM

— 512 Bytes Data RAM

— On-Chip Memory-Mapped Control Registers

— Access to RTC and CMOS Registers

— Up to 16x8 Keyboard Scan Matrix

— Two-16 Bit Timer/Counters

— Integrated Full-Duplex Serial Port Interface

— Eleven 8051 Interrupt Sources

— Thirty-Two 8-Bit, Host/8051 Mailbox Registers

— Thirty-Two Maskable Hardware Wake-Up Events

— Fast GATEA20

— Fast CPU_RESET

— Multiple Clock Sources and Operating Frequencies

— IDLE and SLEEP Modes

— Fail-Safe Ring Oscillator

■ Real-Time Clock

— MC146818 and DS1287 Compatible

— 256 Bytes of Battery Backed CMOS in Two 128-Byte Banks

— 128 Bytes of CMOS RAM Lockable in 4x32-Byte Blocks

— 12- and 24-Hour Time Format

— Binary and BCD Format

— <2µA Standby Current (typ)

■ Two 8584-Style I2C/SMBus Controllers

— 8051 Controlled Logic Allows I2C/SMBus Master or Slave Operation

— I2C/SMBus Controllers are Fully Operational on Standby Power

— 2 Sets of Dedicated Pins per I2C/SMBus Controller

■ Serial Peripheral Interface (SPI)

■ Four independent Hardware Driven PS/2 Ports

■ 41 General Purpose I/O Pins

— 25 Maskable Hardware Wake-Event Capable

— 6 Programmable Open-Drain/Push-Pull Outputs

■ Four Programmable Pulse-Width Modulator Outputs

— Independent Clock Rates

— 6-Bit Duty Cycle Granularity

— Operational in both Full on and Standby modes

■ Dual Fan Tachometer Inputs

■ Debug Port (UART)

— High-Speed 16550A-Compatible UART with 16-Byte Send/Receive FIFOs

— Programmable Baud Rate Generator

— Relocatable to 480 Different Base I/O Addresses

— 15 IRQ Options

■ XNOR-Chain Test Mode

■ 128-Pin QFP and VTQFP Package