User Guide

1.2 System Unit Block Diagram 1 Hardware Overview
Satellite A40 Maintenance Manual (960-458) 1-11
q VGA Controller
Included in the North Bridge
q Sound Controller
AC 97’ Link (in the South Bridge) is used.
• Amplifier, internal stereo speakers, stereo headphone connector, external microphone
connector and volume control knob are mounted.
q EC/KBC (Embedded Controller/Keyboard Controller)
One SMSC LPC-47N259 micon chip functions as both EC and KBC.
• EC
This controller controls the following functions:
– Power supply sequence
– Thermal conditions
– LEDs
– Beep
– Device ON/OFF
– Fan speed
– Universal I/O port
– Docker Docking Sequence
– Battery capacity check
– Forced reset
– Flash rewriting
– EC interface
– I2C communication
– EC access
– Slim Select Bay Control
• KBC
This controller has the following functions:
– Scan controller to check status of keyboard matrix
– Interface controller between the keyboard scan controller and the system
– Control of switching and simultaneous operation of the accupoint/external PS/2
mouse and of the internal keyboard/external PS/2 keyboard
q PSC (Power Supply Controller)
• One Toshiba TMP87PM48U chip is used.
• This controller controls the power sources.