92HD81 Datasheet, PDF (37/279 Pages) Integrated Device Technology – SINGLE CHIP PC AUDIO SYSTEM

92HD81
SINGLE CHIP PC AUDIO SYSTEM, CODEC+SPEAKER AMPLIFIER+CAPLESS HP+LDO
DAC 0
+0/+10/+20/+30 dB
DMIC_0
Boost
DMIC
DMIC_0
Pin 4
DMIC_CLK
Pin 2
Digital PC Beep
MixerOutVol
DAC0
DAC1
DAC2
Analog Beep

LO
Boost
PORT E
Pin Complex
Pins 15/16
Aux Audio Out
(Disabled if Port
F in use)
LO
Boost
+0/+10/+20/+30 dB
Mic Bias
PORT C
Pin Complex
Pins 19/20
MIC Jack
(Disabled)
EAPD
(pin)
Aux
Support
Enable¹
D MIc
detect
Port F
detect
Ports A, B, C,
D, E detect
Port E behavior
0
X
X
X
NA
disabled
1
0
X
X
NA
Widget controlled
1
1
1
0
DMIC routed through CODEC DAC to port E. DMIC
NA
Clock provided from external source through DCLK
pin. 3.072MHz typ.
1
1
1
1
NA
CODEC DAC and Port E disabled
1.default value for Aux Audio Enable is determined by bond option.
2.23.4. EAPD
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.
2.23.5. Analog PC_Beep
Analog PC_Beep may be supported in Aux Audio mode. By default, analog PC_Beep is disabled. If
the CODEC is programmed 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.
2.23.6. Firmware/Software Requirements:
If it is desirable to stop the HD Audio bus while the CODEC is in D3 under OS control per ECR-15b,
Firmware must disable the AUX Audio Mode support in the CODEC prior to loading the OS. If Aux
Audio Mode is not disabled in the CODEC, the CODEC will report to the OS driver that stopping the
bus clock while the CODEC is in D3 is not supported or not available.
IDT CONFIDENTIAL
37
©2009 INTEGRATED DEVICE TECHNOLOGY, INC.
V 0.995 01/11
92HD81