92hd87b4x5ndg Integrated Device Technology, 92hd87b4x5ndg Datasheet - Page 27

• Manufacturer Part Number: 92hd87b4x5ndg
• Description: Single Chip Pc Audio System Codec+stereo Speaker Amplifier+capless Hp+ldo
• Manufacturer: Integrated Device Technology

IDT PROPRIETARY / IDT
SINGLE CHIP PC AUDIO SYSTEM, CODEC+SPEAKER AMPLIFIER+CAPLESS HP+LDO
92HD87
SINGLE CHIP PC AUDIO SYSTEM, CODEC+SPEAKER AMPLIFIER+CAPLESS HP+LDO
2.18. GPIO
2.19. HD Audio HDA015-B support
2.18.1. GPIO Pin mapping and shared functions
2.18.2. Digital Microphone/GPIO Selection
CONFIDENTIAL
The BTL amplifier includes thermal management circuitry. When the CODEC reaches a temperature
of about 135 degrees, the output amplitude of the BTL amp is gradually lowered until the tempera-
ture falls below 135.
Maximum gain for the BTL amplifier is programmable. The following 4 gain settings relative to a
nominal line output are desired: +6.5dB, +9.5dB, +14.5dB and +16.5dB. Absolute gain may vary and
the suggested accuracy is +/-1.5dB. The gain is exposed in a vendor specific widget and is intended
to mimic the pin programmable gain implemented in discrete BTL amplifiers commonly used in note-
book computers.
2 functions are available on the DMIC_CLK/GPIO1 (pin 2) and the DMIC_0/GPIO2 (pin 3) pins. To
determine which function is enabled, the order of precedence is followed:
1. If GPIOs are not enabled through the AFG, then at reset, pins 2 and 4 are pulled low by an inter-
2. If the GPIO 1 is enabled, the 2 DMIC pins become mute (unless programmed for GPIO use) and
3. If GPIO2 is enabled through the AFG, pin 3 becomes a GPIO and is pulled low by an internal
4. If the port is enabled as an input, the digital microphones will be used.
5. If the port is not enabled as an input or if the pin is configured as a GPIO, the digital microphone
Although HDA015-B is not yet complete (not a DCN), the 92HD87 will implement complete support
for the specification building on the support already present in previous products. HDA015-B fea-
tures supported are:
•
•
•
•
GPIO
#
1
2
nal pull-down resistor.
pin 2 becomes an internal pull-down.
pull-down resistor.
path will be mute.
Persistence of many configuration options through bus and function group reset.
The ability to support port presence detect in D3 even when the HD Audio bus is in a low power
state (no clock.)
Fast resume times from low power states: 1ms D1 to D0, 2ms D2 to D0, 10mS D3 to D0.
Notification if persistent register settings have been unexpectedly reset.
Pin
2
3
Supply GPI/O
DVDD YES
DVDD YES
GPI
27
GP
O
VrefOut
IN
DMIC
CLK
VOL
92HD87
Pull
Up
Pull
Down
50K
50K
PC AUDIO
V 0.95 10/10