92HD87 Datasheet, PDF (25/204 Pages) Integrated Device Technology – SINGLE CHIP PC AUDIO SYSTEM

92HD87
SINGLE CHIP PC AUDIO SYSTEM, CODEC+STEREO SPEAKER AMPLIFIER+CAPLESS HP+LDO
AFG
Power
State
D0-D3
D0
D1
D2
D2
D3
D3
D3cold
D4
D5
RESET#
BEEP
Override
EAPD
Pin Behavior
Power State
Asserted (Low)
De-Asserted (High)
De-Asserted (High)
De-Asserted (High)
De-Asserted (High)
De-Asserted (High)
De-Asserted (High)
De-Asserted (High)
De-Asserted (High)
De-Asserted (High)
-
-
-
Disabled
Enabled
Disabled
Enabled
-
-
-
-
-
D0-D1
D0-D2
D0-D2
D0-D3
D0-D3
-
-
-
Active low immediately after power on, otherwise the
previous state is retained across FG and link reset events
Active - Pin reflects EAPD bit unless held low by external
source.
Active - Pin reflects EAPD bit unless held low by external
source.
Pin forced low to disable external amp
Active - Pin reflects EAPD bit unless held low by external
source.
Pin forced low to disable external amp
Active - Pin reflects EAPD bit unless held low by external
source.
Pin forced low to disable external amp
Pin forced low to disable external amp
Pin Hi-Z (off)
Table 9. EAPD Behavior
Figure 5. 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
25
©2009 INTEGRATED DEVICE TECHNOLOGY, INC.
V 0.995 01/11
92HD87