HP KAYAK XU800 Devices on the SMBus, Audio Chip, Specifications

2 System Board

The Input/Output Controller Hub (82801AA)

Audio Chip

Specifications

Feature		Description
Digitized Sounds	• 16-bit and 8-bit stereo sampling from 4 kHz to 48 kHz.
	• Hardware Full Duplex Conversion.
	• 16-bit software-based real-time audio compression/
		decompression system.
Music Synthesizer	• Integrated OPL3 compatible music synthesizer.
Mixer	•	MPC-3 audio mixer.
	• Input mixing sources: microphone, LINE In,
		CD Audio, AUX Audio, and digitized sounds.
	• Output mixing of all audio sources to the LINE Out or
		integrated PC Workstation speaker.
	• Multiple source recording and Left/Right channels balance.
Line Input	•	Input impedance: 17k Ω (ohms).
	• Input range: 0 to 2.83 Vpp
Line Output	• Stereo output of 100 mW per channel with headphone
		speakers (impedance 32 Ω).
	• Output impedance: 570 Ω.
	• Output range: 0 to 2.83 Vpp.
Microphone Input	• 20 dB gain preamplifier. The boost can be muted with
		software.
	• 32-level programmable volume control.
	• Input impedance: 600 Ω.
	• Sensitivity: 30 mVpp to 283 mVpp.
Stereo Out Jack	•	Impedance: 32 Ω.

Devices on the SMBus

The SMBus is a subset of the I2C bus. It is a two-wired serial bus which runs at a maximum speed of 100 kHz. It is used to monitor some of the hardware functions of the system board (such as voltage levels, temperature, fan speed, memory presence and type), both at system boot and during normal run-time. It is controlled by the SMBus controller located in the ICH.

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