92HD66B Datasheet, PDF (30/286 Pages) Integrated Device Technology – FOUR CHANNEL HD AUDIO CODECS

92HD66B
FOUR CHANNEL HD AUDIO CODECS WITH DUAL CAPLESS HEADPHONE AMPLIFIERS
Figure 7. Analog PCBeep Flow Chart
POR
Wait
64mS
IDLE
NO
NO
Link Reset
Active?
NO
NO
NO
Analog
PC_Beep
Enabled?
YES
YES
Activity on Pin?
YES
Turn on
Amplifiers / Enable
Beep Path
YES
Activity on Pin?
Activity on Pin?
NO
NO
Inactivity over
threshold?
YES
Disable Beep
Path / Turn off
Amplifiers
Digital detector will detect the “BEEP_SENSE” following the state machine in Figure above and out-
put a signal called “BEEP_PRESENCE”. BEEP_PRESENCE is 1 when the state is Beep
_Presence. Otherwise, it is 0.
In the 1ms window, the signal will be sampled and counted in first 500us of 1ms window. The coun-
ter will be reset during the second 500us of 1ms window. So the actual sample period is 500us. The
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92HD66B