92HD99B Datasheet, PDF (19/225 Pages) Integrated Device Technology – SINGLE CHIP PC AUDIO SYSTEM

92HD99
SINGLE CHIP PC AUDIO SYSTEM, CODEC+SPEAKER AMPLIFIER+CAPLESS HP+LDO
D1 or D0) or (Analog PC_Beep is enabled and port is enabled as an output) and the port’s EAPD bit
is set to 1. The state of the EAPD pin (unless configured as an input or held low by an external circuit
when configured as an open drain output) will be the logical OR of the external amp power up
requests from all ports.
By default, the EAPD pin also functions as the Mute#/ShutDown# input for the internal BTL amplifier.
In this mode, a low value at the pin (either due to internal EAPD being 0, or to an external entity forc-
ing the pin low) will cause the internal BTL amplifier to mute or enter a low power state depending on
the amplifier configuration. (See below)
Vendor specific verbs are available to configure this pin. These verbs retain their values across link
and single function group resets but are set to their default values by a power on reset:
MODE1
0
0
1
1
MODE0
0
1
0
1
EAPD Pin Function
Open Drain I/O
CMOS Output
CMOS Input
CMOS Input
Description
Value at pin is wired-AND of EAPD bit and external signal.(default)
Value of EAPD bit in pin widget is forced at pin
External signal controls internal amps. EAPD bit in pin widget ignored
External signal controls internal amps. EAPD bit in pin widget ignored
Table 7. EAPD Pin Mode Select
Control Flag
Description
EAPD PIN MODE 1:0 Defines if EAPD pin is used as input, output, or bi-directional port (Open Drain)
BTL/HP SD
0 = Amp controlled by EAPD pin only (default) / 1 = Amp controlled by power state (pin and FG) only
BTL/HP SD MODE
0 = Amp will mute when disabled. / 1 = Amp will shut down (enter a low power state) when disabled (default
for YA forward)
BTL/HP SD INV
0 = AMP will power down (or mute) when EAPD pin is low (default) / 1 = Amp will power down (or mute)
when EAPD pin is high.
Table 8. Control bit descriptions for BTL amplifier and Headphone amplifier enable configurations
BTL SD
0
0
0
0
0
0
0
0
1
1
BTL SD
MODE
0
0
0
0
1
1
1
1
0
1
BTL SD INV
0
0
1
1
0
0
1
1
NA
NA
EAPD Pin
State
0
1
0
1
0
1
0
1
NA
NA
BTL Amp State
Amplifier is mute (default¹)
Amplifier is active
Amplifier is active
Amplifier is mute
Amplifier is in a low power state
Amplifier is active
Amplifier is active
Amplifier is in a low power state
Amplifier follows pin/function group power state and will mute when disabled
Amplifier follows pin/function group power state and will enter a low power
state when disabled
Table 9. BTL Amp Enable Configuration
1. EAPD bit is set to one by default but the EAPD state is 0 after power-on reset because the function group is not in D0. The state after
a single or double function group reset will be compliant with HDA015-B.
IDT CONFIDENTIAL
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92HD99