© 2006 Winbond Electronics Corporation

www.winbond.com

Product Brief

February 2006

Revision 1.1

PC97551

Embedded Controller for Notebook Systems

General Description

The Winbond PC97551 is an embedded controller (EC) for

mainstream notebook applications. It includes a highly opti-

mized set of functions, which provide a hardware/firmware

partition that enables the implementation of flexible solu-

tions; and its high-performance CPU core enables EC func-

tionality to be extended via the firmware.

The PC97551 incorporates National’s CompactRISC CR16B

core (a high-performance 16-bit RISC processor), internal

ROM and RAM memories, system support functions and a

Bus Interface Unit (BIU) that directly interfaces with both ex-

ternal memory (such as flash) and I/O devices.

System support functions include: watchdog, PWM, timers,

interrupt control, General-Purpose I/O (GPIO) with internal

keyboard matrix scanning, PS/2® Interface, SMBus® inter-

face, analog-to-digital (ADC) and digital-to-analog (DAC)

converters for battery charging circuitry, system monitoring

and analog controls.

The PC97551 interfaces with the host via an LPC interface

that provides the host with access to the Keyboard and em-

bedded controller interface channels and to the BIOS flash.

Like other members of Winbond’s Advanced I/O family, the

PC97551 is PC01 and ACPI compliant.

Outstanding Features

■

Host interface, based on Intel’s LPC Interface Specifi-

cation Revision 1.1, August 2002

■

PC2001 Rev 1.0, and ACPI 3.0 compliant

■

16-bit RISC core, with 2 Mbytes address space, run-

ning at up to 20 MHz

■

Shared BIOS flash memory (external)

■

92 GPIO ports (including keyboard scanning) with a

variety of wake-up events

■

JTAG-based debugger interface

■

Software and hardware controlled clock throttling and

extremely low current consumption in Idle mode

■

176-pin LQFP and FBGA packages

System Block Diagram

Lid

Display

Switch

Brightness

Contrast

On/Off

Keyboard Mouse

4 x

Touch

Pad

Touch

Point

Keyboard

Internal

Keyboard Scan

and LEDs

Switch Pad

System Control

and Status

Power Switch

Speaker

Beep

PS/2

Shared Flash Memory

EC Firmware,

System BIOS

Input

Port

Output

Port

Expansion GPIOs

Local Bus

PCI

Devices

& Boards

Wake-Up

Enable

South Bridge

Power

Supply

Charger

Battery

E2PROM

Docking

Temp.

Sensor

2 x

SMBus

Control Direct CD

Player

AC Adaptor

CPU

Drv

Drv

Drv.

Tacho

PWM

SuperI/O

Sleep

State

ECSCI

PWUREQ

SMI

ON

Control

PWBTN

LPC

PCI

JTAG

Development

Fans

Temperature

Voltage

Current

AC

ON and

Control

Switch

Voltage

Current

Voltage

Temp.

PC97551

TPM

Embedded Controller

for Notebook Systems

Detect