92HD91 Datasheet, PDF (19/298 Pages) Integrated Device Technology – SINGLE CHIP PC AUDIO SYSTEM

92HD91
SINGLE CHIP PC AUDIO SYSTEM, CODEC+SPEAKER AMPLIFIER+CAPLESS HP+LDO
2.6. Power Management
The HD Audio specification defines power states, power state widgets, and power state verbs.
Power management is implemented at several levels. The Audio Function Group (AFG) , all con-
verter widgets, and all pin complexes support the power state verb F05/705. Converter widgets are
active in D0 and inactive in D1-D3.
The following table describes what functionality is active in each power state.
Function
SPDIF Outputs
Digital Microphone inputs
DAC
D2S
ADC
ADC Volume Control
Ref ADC
Analog Clocks
GPIO pins
VrefOut Pins
Input Boost
Analog mixer
Mixer Volumes
Analog PC_Beep
Digital PC_Beep
Lo/HP Amps
Cap-less HP Amps
BTL Amp
VAG amp
Port Sense
Reference Bias generator
Reference Bandgap core
HD Audio-Link
D0
D1¹
D2
D3
D3cold
Vendor
Vendor
Specific D4 SpecificD5
On
On On (idle) On (idle)⁵
Off
Off
Off
On
Off
Off
Off
Off
Off
Off
On
Off
Off
Off
Off
Off
Off
On
Off
Off
Off
Off
Off
Off
On
Off
Off
Off
Off
Off
Off
On
Off
Off
Off
Off
Off
Off
On
Off
Off
Off
Off
Off
Off
On
Off
Off
Off
Off
Off
Off
On
On
On
On⁵
On
On
Off
On
On
Off
Off
Off
Off
Off
On
On
Off
Off
Off
Off
Off
On
On
Off
Off
Off
Off
Off
On
On
Off
Off
Off
Off
Off
On
On
On
On
Off
Off
Off
On
On
On
On⁵
Off
Off
Off
On
On
On
Low Drive² Low Drive² Low Drive²
Off
On
On
On
Low Drive² Low Drive² Low Drive²
Off
On
On
On
Low Drive²
Off
Off
Off
On
On
On
Low Drive³ Low Drive Low Drive
Off
On
On
On
On⁴
Off
Off
Off
On
On
On
On
On
On
Off
On
On
On
On
On
On
Off
On
On
On
On⁵
Limited
Off
Off
Table 6. Power Management
1. No DAC or ADC streams are active. Analog mixing and loop thru are supported.
2. VAG is kept active when ports are disabled or in D3/D3cold/D4. PC_Beep is supported in D3 but may be attenuated and
distorted depending on load impedance. The codec will shut down the capless headphone amplifiers and BTL amplifier in
D3 and below. In D3, Hendrix/Kaveri will turn on the BTL and Capless amplifiers if activity is detected on the PC_BEEP
input and analog PC_Beep is enabled.
3. VAG is always ramped up and down gradually, except in the case of a sudden power removal. VAG is active in D2/D3 but
in a low power state.
4. Both AVDD and DVDD must be available for Port Sense to operate.
5. Not active if BITCLK is not running (Controller in D3), but can signal power state change request (PME)
The D3-default state is available for HD Audio compliance. The programmable values, exposed via
vendor-specific settings, are under IDT Device Driver control for further power reduction. The analog
mixer, line and headphone amps, port presence detect, and internal references may be disabled
using vendor specific verbs. Use of these vendor specific verbs will cause pops.
IDT™ CONFIDENTIAL
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©2009 INTEGRATED DEVICE TECHNOLOGY, INC.
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92HD91