Product Brief
December 2006
Revision 1.0
87541V
Embedded Controller for Mobile Systems
General Description
The Winbond 87541V is an embedded controller (EC) for
mainstream notebook applications. It contains a highly opti-
mized set of functions, providing a hardware/firmware parti-
tion that enables the implementation of flexible solutions; and
it incorporates the National Semiconductor
®
CompactRISC
™
CR16B core (a high-performance 16-bit RISC processor),
which enables the EC functionality to be extended via the
firmware.
In addition, the 87541V contains internal ROM and RAM
memories, system support functions and a Bus Interface
Unit (BIU) that directly interfaces with both external 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, and analog-to-digital (ADC) and digital-to-analog
(DAC) converters for battery charging, system monitoring
and analog controls.
The 87541V interfaces with the host via an LPC interface,
which provides the host with access to the Keyboard and
embedded controller interface channels and to the BIOS
flash.
Like other members of Winbond’s Advanced I/O family, the
87541V is PC01 and ACPI compliant.
Outstanding Features
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Host interface, based on Intel’s
LPC
Specification Revision 1.1,
August 2002
PC01 Rev 1.0, and ACPI 2.0 compliant
Interface
16-bit RISC core, with 2 Mbytes address space,
running at up to 20 MHz
Shared BIOS flash memory (external)
88 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 package
System Block Diagram
South Bridge
PWBTN
Display
Lid
Switch
Keyboard Mouse Pointing
Device
PCI
SuperI/O
with
Integrated
TPM
LPC
ECSCI Sleep ON
PWUREQ State Control
SMI
Brightness
Contrast
On/Off
3x
PS/2
Internal
Keyboard
Keyboard Scan
PCI
Devices
& Boards
JTAG
PWM
Wake-Up
Enable
System Control
and Status
Switch Pad
and LEDs
Power Switch
Development
Tacho
87541V
Embedded Controller
for Mobile Systems
Beep
Speaker
EC Firmware,
System BIOS
Shared Flash Memory
Local Bus
ON and
Switch
Control
Control
Direct CD
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
© 2006 Winbond Electronics Corporation
www.winbond.com
WINBOND [ WINBOND ]
