92HD91 Datasheet, PDF (26/298 Pages) Integrated Device Technology – SINGLE CHIP PC AUDIO SYSTEM

92HD91
SINGLE CHIP PC AUDIO SYSTEM, CODEC+SPEAKER AMPLIFIER+CAPLESS HP+LDO
AFG
Power
State
D2
D3
D3
D3cold
D4
D5
RESET#
Analog Port Power
PC_BEEP
State
Pin Behavior
De-Asserted (High)
De-Asserted (High)
De-Asserted (High)
De-Asserted (High)
De-Asserted (High)
De-Asserted (High)
Enabled
Disabled
Enabled
-
-
-
D0-D2
Active - EAPD Pin high if any port EAPD bit =1 and that port also
enabled as output.
D0-D3
Pin forced low to disable external amp
D0-D3
Active - EAPD Pin high if any port EAPD bit=1 and that port also
enabled as output.
-
Pin forced low to disable external amp
-
Pin forced low to disable external amp
-
Pin Hi-Z (off)
Table 15. EAPD Behavior
Figure 3. HP EAPD Example to be replaced by single pin for internal amp
HP AUDIO CONTROL BLOCK DIAGRAM
MUTE +
UP/DOWN
BUTTONS
(MUTE LED ON
SAME BOARD)
SYNC FROM KBC TO OS
OS
SCAN
CODES
KBC
SYNC FROM AUDIO GUI TO KBC
A_EAPD
A_SD
GPIO_1
CODEC
SPKR_EN#
SPKR AMP
IDT™ CONFIDENTIAL
26
©2009 INTEGRATED DEVICE TECHNOLOGY, INC.
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92HD91