alc272 Realtek Semiconductor Corporation, alc272 Datasheet - Page 32

• Manufacturer Part Number: alc272
• Description: 4 Channel High Definition Audio Codec
• Manufacturer: Realtek Semiconductor Corporation

ALC272
Datasheet
7.5. Power Management
The ALC272 is designed to meet Intel’s low-power-state white paper and is ECR HDA-015B compliant.
It meets the five attributes discussed in the white paper:
1. D3 state power < 30mW (without PC-Beep pass-through Function, with PC-Beep pass-through
Function, the criteria is 60mW.
2. Exit latency (D3 to D0 transfer) < 10ms.
3. Audio pop/click suppression during D3 and D0 transition < -65dBV.
4. Supports Jack detection in D3 state.
5. D3 functions with or without the BITCLK
The ALC272 minimizes D3 state idle mode power consumption and increases overall battery life in
mobile systems.
In D3 mode, only a power on reset or a ‘double function reset’ resets all ALC272 settings, cutting
software configuration time spent entering/leaving D3 state, and reducing latency time for D3 to D0
transitions.
The ALC272 supports Wake-Up events in D3 mode, including jack detection and GPIO status changes. If
the HDA-Link was alive (with BCLK), the ALC272 Wake-Up response is as normal. If no BITCLK is
present, the ALC272 drives the SDI high in order to wake up the system
Figure 14. Resume From External Event (Wake-Up Event)
4 Channel High Definition Audio Codec
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Track ID: JATR-1076-21
Rev. 1.0