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92HD99B Datasheet, PDF (29/225 Pages) Integrated Device Technology – SINGLE CHIP PC AUDIO SYSTEM
92HD99
SINGLE CHIP PC AUDIO SYSTEM, CODEC+SPEAKER AMPLIFIER+CAPLESS HP+LDO
Detection of a microphone is not reported unless plug insertion is also detected.
2.21. GPIO
2.21.1. GPIO Pin mapping and shared functions
GPIO
#
Pin
Supply GPI/O GPI GPO VrefOut DMIC VOL
Pull
Up
0
38
DVDD YES
IN
1
2
DVDD YES
CLK
2
3
DVDD YES
IN
3
38
DVDD YES
4
20
AVDD YES
YES
Pull
Down
50K
50K
50K
50K
50K
2.21.2. Digital Microphone/GPIO Selection
Functions are available on the GPIO0 pin. To determine which function is enabled, the order of pre-
cedence is followed:
1. If the GPIOs are enabled, they override 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. 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.
2.21.3. 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 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.
2.22. 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.)
3. Fast resume times from low power states: 1ms D1 to D0, 2ms D2 to D0, 10mS D3 to D0.
IDT CONFIDENTIAL
29
©2009 INTEGRATED DEVICE TECHNOLOGY, INC.
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92HD99