Toshiba Satellite M40 Maintenance Manual page 30

1.2 System Unit Components
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
? EC
? Battery EE PROM
? 24C02 equivalent (128 words x 16 bits, I2C interface) integrated in the battery pack
? Clock Generator
? ICS954206B
Satellite M40/M45 TECRA A4 dynabook Vx/4 Maintenance Manual
Scan controller function
Interface controller function
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
Storing records of battery use
1 Hardware Overview
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