PC97551 Embedded Controller for Notebook Systems
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鈥檚 CompactRISC
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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
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Interface, SMBus
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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鈥檚 Advanced I/O family, the
PC97551 is PC01 and ACPI compliant.
Outstanding Features
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Host interface, based on Intel鈥檚
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
South Bridge
PWBTN
Display
Lid
Switch
Keyboard Mouse Touch Touch
Pad Point
SuperI/O
LPC
PCI
TPM
Wake-Up
Enable
ECSCI Sleep ON
PWUREQ State Control
SMI
Brightness
Contrast
On/Off
4x
PS/2
Internal
Keyboard
Keyboard Scan
System Control
and Status
Switch Pad
and LEDs
Power Switch
PCI
Devices
& Boards
JTAG
PWM
PC97551
Beep
Development
Tacho
Embedded Controller
for Notebook Systems
Control
Direct CD
Speaker
EC Firmware,
System BIOS
Shared Flash Memory
Local Bus
ON and
Switch
Control
Drv
Drv
Drv.
Voltage
Current
AC
Detect
Voltage
Current
Voltage
Temp.
Player
2x
SMBus
Input
Port
Output
Port
Expansion GPIOs
CPU
Fans
Temperature
Power
Supply Charger Battery
AC Adaptor
Temp.
Sensor
E
2
PROM Docking
漏 2006 Winbond Electronics Corporation
www.winbond.com
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