87541V Datasheet, PDF (1/4 Pages) Winbond – Embedded Controller for Mobile Systems

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
■ Host interface, based on Intel’s LPC Interface
Specification Revision 1.1, August 2002
■ PC01 Rev 1.0, and ACPI 2.0 compliant
■ 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
Display
Keyboard
Mouse
Pointing
Device
SuperI/O
with
Integrated
TPM
PCI
LPC
PWBTN
ECSCI _{Sleep ON}
PWUREQ _{State Control}
SMI
Lid
Switch _Brightness
Contrast
On/Off
3x
PS/2
PCI
Devices
& Boards
JTAG
Wake-Up
Enable
Development
PWM
Tacho
87541V
Embedded Controller
for Mobile Systems
Keyboard Scan
Internal
Keyboard
Switch Pad
System Control and LEDs
and Status
Beep
Power Switch
Speaker
Shared Flash Memory
EC Firmware,
System BIOS
Local Bus
D^Dr^Dv^rrv.^v
Voltage
Current
CPU
Fans
Temperature
AC
Detect
ON and
Switch
Control
Voltage
Current
Control _{Direct CD}
Voltage
Temp.
Player
2x
SMBus
Power
Supply
Charger
Battery
Input Output
Port Port
Expansion GPIOs
AC Adaptor
Temp.
Sensor
E²PROM Docking
© 2006 Winbond Electronics Corporation
www.winbond.com