1.2 System Unit Components 1 Hardware Overview
Satellite M40/M45 TECRA A4 dynabook Vx/4 Maintenance Manual 15
The AD1981B integrated audio controller supports multimedia. The sound system feature
contains the following:
? Variable Sample Rate Audio
? External Audio Power –Down Control
? Integrated Stereo Headphone Amplifier
? Stereo Full-Duplex Codec
? 20-Bit PCM DAC
? Dual MIC Input with Built-In Programmable Preamp
? High Quality CD Input with Ground Sense.
? KBC/EC (Keyboard Controller/Embedded Controller)
A single LPC 47N249 chip is used to serve as KBC/ EC and Super IO.
? KBC
? Scan controller function
? Interface controller function
? EC
? Power supply sequence control
? Overheat shutdown support
? LED control
? Beep control
? Device ON/OFF
? Cooling fan speed control
? Universal I/O port
? Battery capacity check
? Flash memory reprogramming function
? EC access interface
? I2C communication control
? Battery EE PROM
? 24C02 equivalent (128 words x 16 bits, I2C interface) integrated in the battery pack
? Storing records of battery use
? Clock Generator
? ICS954206B