STV82X6 View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
'STV82X6' PDF : 97 Pages View PDF
STV82x6
5 Additional Controls and Flags
Additional Controls and Flags
5.1 Interrupt Request
The identified TV sound standard is displayed in register AUTO_STAT. Each change in the detected
standard is flagged to the host system via hardware pin IRQ. The flag must be reset by re-
programming the IRQ bit in register AUTO_CTRL and then checking the detected standard status
by reading registers AUTO_STAT, NICAM_STAT, ZWT_STAT and CH_MX.
5.2 I²C Bus Expander
Pins BUS0 and BUS1 can be used to control external switchable IF SAW filters or audio switches.
These pins can be directly programmed by register CTRL.
5.3 Stereo Flag
For Loudspeakers only, a Stereo Mode Detection flag (the ST_ID bit in register AUTO_STAT) is set
when a demodulated source is selected and a stereo standard is detected. The stereo flag is also
output on pin ST in order to control an external indicator (e.g. LED). The stereo mode is also
displayed by status register AUTO_STAT.
CAUTION: When the I²S input is selected, the stereo flag is no longer available on pin ST.
5.4 Headphone Detection
For the headphone, the HPD input can be used to automatically mute the Loudspeaker and
Subwoofer outputs when the HPD_ON bit is set in register ANA_LS_HP (active low). The HPD pin
must be set for the mute function to be active.
Figure 16: Headphone Detection
STV82x6
Mute Control
Loudspeaker
Audio Processing
Subwoofer
Audio Processing
Right
Left
Sub-
woofer
I²C Control
Headphone
Audio Processing
Headphone
Detection
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