92HD92 Datasheet, PDF (42/306 Pages) Integrated Device Technology – SINGLE CHIP PC AUDIO SYSTEM

92HD92
SINGLE CHIP PC AUDIO SYSTEM, CODEC+SPEAKER AMPLIFIER+CAPLESS HP+LDO
If it is desirable to stop the HD Audio bus while the CODEC is in D3 under OS control per ECR-15b,
no action is required. The CODEC will not enter Aux Audio Mode unless placed in D3cold.
2.28.4. Part Options Supporting I²S I/O
Ports E and F are implemented using an I²S digital interface. The SPDIF pins (pins 46 and 48) are
used to connect to an external Aux Audio Module. The CODEC is a LR_CLK and S_CLK clock slave
to the external module, if present, and is the timing master in normal mode. The CODEC is an MCLK
slave by default in both Aux Audio and Normal modes.
The internal routing of the playback and record paths are functionally similar to an analog implemen-
tation but must be processed differently because the audio data is now digital. In addition, the
PC_Beep pin is replaced by a secondary I2S data input that is used in both Aux Audio and normal
modes of operation. The following diagrams illustrate.
2.28.5. “Playback Path” Port Behavior (Digital I/O)
Input from the Aux Audio Module (Aux_In) is routed to Port D (“internal speakers”), Port B (system
headphone port), and Port E (“dock Line Out”) directly. The Secondary Audio input is mixed with the
Aux_In input.
2.28.6.
When Port E presence detect = 0
• Presence detect for Port E = 0 (nothing plugged in)
• Aux_In, the “Aux Audio Playback”, input is mixed with the Secondary Audio input and routed to
Port B, or Port D when that port is active.
• If Port B is in use (port presence detect = 1), Port D, internal speakers, will be inactive (off) and
Port E, the dock headphone, will be mute.
• The power supply (charge pump) for B will be inactive if B is not in use.
• If Port B is not in use (port presence detect = 0), Port D, internal speakers, will be active and port
B will be inactive.
• EAPD must not be forced low due to the dock being absent or high when a dock is present.
EAPD is used to indicate if AUX Audio Mode is in use.
2.28.7.
When Port E presence detect = 1
• Presence detect for Port E = 1 (something plugged in)
• Port D is disabled
• If Port B is in use (port presence detect = 1), that port will be enabled and output the audio enter-
ing Aux_In mixed with the audio on the Secondary Audio input.
• The power supply for port B will be active if port B is in use.
• If Port B is not in use (port presence detect = 0), port B will be inactive and the audio on Aux_In
will be mixed with the audio from the Secondary Audio input and routed to Port E, the dock
headphone jack.
• EAPD must not be forced low due to the dock being absent or high when a dock is present.
EAPD is used to indicate if AUX Audio Mode is in use.
IDT™ CONFIDENTIAL
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©2009 INTEGRATED DEVICE TECHNOLOGY, INC.
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92HD92