92hd91 Integrated Device Technology, 92hd91 Datasheet - Page 43

• Manufacturer Part Number: 92hd91
• Description: Single Chip Pc Audio System Codec+speaker Amplifier+capless Hp+ldo
• Manufacturer: Integrated Device Technology

92HD91
SINGLE CHIP PC AUDIO SYSTEM, CODEC+SPEAKER AMPLIFIER+CAPLESS HP+LDO
©2009 INTEGRATED DEVICE TECHNOLOGY, INC.
IDT™ CONFIDENTIAL
2.26.8. EAPD
2.26.9. Analog PC_Beep
Figure 16. Aux Audio Record when the System is Docked with the System Microphone Plugged In
Figure 17. Aux Audio Record when the System is Docked with the Dock Microphone Plugged In
D-MIC
SPKR
MIC
HP
NA
D-MIC
SPKR
MIC
HP
NA
Since the Aux Audio mode overrides the default behavior but not the actual port settings when in
reset, the logical state of the EAPD pin must be overridden as well. When Aux Audio mode is
enabled and the part is in reset as described above, the logical state of EAPD will be 1 (External
Amplifier Powered Up) unless held low by an external circuit. This ensures that audio pass-thru and
analog PC_Beep will be supported.
Analog PC_Beep is supported in Aux Audio mode. By default, analog PC_Beep is disabled but may
be enabled due to Beep pass-thru support in reset (see the PC_Beep section). If the CODEC is pro-
grammed to enable analog PC_Beep and Aux Audio mode is enabled, the next time reset is
asserted, the analog PC_Beep pin will be mixed at each of the active outputs.
DM
A
B
D
C
DM
A
B
D
C
DAC
EQ
S
DAC
EQ
S
Record Dock Mic
Record Analog Mic
S
S
HD Audio Interface
HD Audio Interface
Filter
Beep
PC
Filter
Beep
PC
43
EC
EC
S
S
E
F
E
F
CODEC
I2S
CODEC
I2S
Aux Audio
Module
Routing
Aux Audio
I2S
Module
Routing
I2S
Dock
Dock
MIC
HP
MIC
HP
V 0.91 10/10
92HD91