alc885-gr Realtek Semiconductor Corporation, alc885-gr Datasheet - Page 94

• Manufacturer Part Number: alc885-gr
• Description: 7.1+2 Channel High-performance Hda Codec With Content Protection
• Manufacturer: Realtek Semiconductor Corporation

11. Application Supplements
11.1. Standby Mode
In standby mode the ALC885 turns on all DC bias on all input and output ports (NID=14h~1Bh). This is
a special application to avoid ‘PoP’ noise while in power on and power off periods.
Table 94 shows the DC bias state when Standby mode is enabled.
11.2. Volume Knob Control
11.2.1. GPI Volume Control via GPIO0 (Up/Down), GPIO1 (Mute)
Low pulses, generated at GPIO0 and GPIO1, are used to calculate the Up and Down count into 7 bits of
volume step. ‘Mute’ is also sampled by 512*SYNC to toggle the mute status. Hardware will not adjust
volume; the count value will be reported by unsolicited response to software.
7.1+2 Channel High-Performance HDA Codec
With Content Protection
+3.3V on DVDD (Pin-1)
Yes (>2.0V)
Yes (>2.0V)
No (<2.0V)
No (<2.0V)
Figure 22. GPI Volume Control Implementation
Table 94. Standby Mode
+5VA on AVDD
Yes
Yes
No
No
86
Operation Mode
Standby Mode
Shut Down
Normal
Normal
ALC885 Series
Datasheet
Rev. 1.1