92HD99B Datasheet, PDF (24/225 Pages) Integrated Device Technology – SINGLE CHIP PC AUDIO SYSTEM

92HD99
SINGLE CHIP PC AUDIO SYSTEM, CODEC+SPEAKER AMPLIFIER+CAPLESS HP+LDO
Figure 6. Stereo Digital Microphone Configuration
Digital
Microphones
Off-Chip On-Chip
External
Multiplexer
DMIC_0
Or
DMIC_1
Pin
On-Chip
Multiplexer
STEREO
ADC0 or 1
PCM
Stereo Channels
Output
DMIC_CLK
Pin
DMIC_0
Or
DMIC_1
DMIC_CLK
Valid
Data R
Right
Channel
Valid
Data L
Left
Channel
Valid
Data R
Valid
Data L
Valid
Data R
Note: Some Digital Microphone Implementations support data on either edge, therefore, the
external mux may not be required.
2.14. Analog PC-Beep
The codec supports automatic routing of the PC_Beep pin to Port A, Port B, and Port D outputs
when the HD-Link is in reset.
When the link is active (not held in reset) Analog PC-Beep may be enabled manually. Analog
PC_Beep is mixed at the port and only ports enabled as outputs will pass PC_Beep.
Beep activity monitoring is provided when the analog beep path is enabled and the CODEC or ampli-
fier is in a low power state (D3).
The Analog PC Beep input is sampled for 500us every 1ms. If the beep input is high or low
(>200mVpp) for at least 37% of that time, it is considered active. If it is active for less than 7.5% of
IDT CONFIDENTIAL
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©2009 INTEGRATED DEVICE TECHNOLOGY, INC.
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92HD99