92HD91 Datasheet, PDF (36/298 Pages) Integrated Device Technology – SINGLE CHIP PC AUDIO SYSTEM

92HD91
SINGLE CHIP PC AUDIO SYSTEM, CODEC+SPEAKER AMPLIFIER+CAPLESS HP+LDO
Detection of a microphone is not reported unless plug insertion is also detected.
2.23. GPIO
2.23.1. GPIO Pin mapping and shared functions
GPIO
#
Pin
Supply
SPDIF
In
SPDIF
Out
GPI/O GPI GPO
VrefOut
DMIC
VOL
Pull
Up
0
46
DVDD
YES YES
IN
1
2
DVDD
YES
CLK
2
4
DVDD
YES
IN
3
48
DVDD
YES YES
4
24
AVDD
YES
YES
Pull
Down
50K
50K
50K
50K
50K
2.23.2. SPDIF/Digital Microphone/GPIO Selection
3 functions are available on the DMIC_1/GPIO0/SPDIFOUT1 pin (pin 46). To determine which func-
tion is enabled, the order of precedence is followed:
1. If the GPIOs are enabled, they override both SPDIF_OUT and Digital Mics
2. If the GPIOs are not enabled through the AFG, then at reset, the pin is pulled low by an internal
pull-down resistor.
3. If the port is enabled as an input, the digital microphones will be used.
4. If the port is enabled as an output, the SPDIF output will be used.
5. In the event that the port is enabled as an input and an output, the port will be an output and the
Digital Mic path will be mute.
2.23.3. Digital Microphone/GPIO Selection
2 functions are available on the DMIC_CLK/GPIO1 (pin 2) and the DMIC_0/GPIO2 (pin 4) 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-
nal pull-down resistor.
2. If the GPIO 1 is enabled, the 2 DMIC pins become mute (unless programmed for GPIO or SPDIF
use) and pin 2 becomes GPIO with an internal pull-down.
3. If GPIO2 is enabled through the AFG, pin 4 becomes a GPIO and is pulled low by an internal
pull-down resistor.
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
path will be mute.
2.24. HD Audio HDA015-B support
The codec provides complete support for the HDA015-B specification (now DCN) building on the
support already present in previous products. HDA015-B features supported are:
1. Persistence of many configuration options through bus and function group reset.
2. The ability to support port presence detect in D3 even when the HD Audio bus is in a low power
state (no clock.)
IDT™ CONFIDENTIAL
36
©2009 INTEGRATED DEVICE TECHNOLOGY, INC.
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92HD91