92HD91 Datasheet, PDF (41/298 Pages) Integrated Device Technology – SINGLE CHIP PC AUDIO SYSTEM

92HD91
SINGLE CHIP PC AUDIO SYSTEM, CODEC+SPEAKER AMPLIFIER+CAPLESS HP+LDO
2.26.6. “Record Path” Port Behavior (Analog I/O)
Digital Microphone input DMIC0 is used as an internal microphone port in normal mode. The Digital
Microphone clock pin is enabled in Aux Audio Mode and the digital microphone clock is provided by
an internal oscillator.
If Port F and Port A presence detect = 0, this indicates that nothing is plugged into the dock or sys-
tem; the digital microphone input is converted to analog and sent to the Aux Audio Module through
Port E. If Port A presence detect = 1, this indicates that an external microphone is plugged into the
system jack and port A is sent to the Auxiliary Audio Module through Port E. If Port F presence
detect = 1 (and Port A presence detect = 0), this indicates that an external microphone is plugged
into the dock. External circuitry routes the dock microphone to the Auxiliary Audio Module.
EAPD
(pin)
0
Aux
Support
Enable¹
X
D MIc0
detect
X
Port A
detect
X
Port F
detect
X
Ports B, C, E
detect
NA
Aux_Out behavior
disabled
1
0
X
X
X
NA
Widget controlled
1
1
0
0
0
NA
Mute
1
1
1
0
0
1
1
X
0
1
NA
DMIC converted to analog and routed to module
through port E. DMIC Clock provided by CODEC
NA
Dock Mic routed to module (not through CODEC)
CODEC DMIC interface and Port A disabled
1.default value for Aux Audio Enable is determined by bond option.
2.26.7. SYSTEM DIAGRAMS (Analog I/O)
Figure 12. Aux Audio Playback When Nothing Plugged In (or System is not Docked)
Playback Speaker
D-MIC
MIC
HP
DM
DAC
A
B
S
HD Audio Interface
S
E
F
I2S
CODEC
I2S
Routing
Dock
HP
MIC
SPKR
D
EQ
S
NA
C
PC
Beep
Filter
EC
Aux Audio
Module
IDT™ CONFIDENTIAL
41
©2009 INTEGRATED DEVICE TECHNOLOGY, INC.
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92HD91