STV8287D View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
STV8287D
STMicroelectronics
'STV8287D' PDF : 149 Pages View PDF
STV82x7
Dedicated Digital Signal Processor (DSP)
● In Independent mode, the volume for the Left and Right channels for Loudspeakers or
Headphone is controlled independently.
Figure 20: Differential Balance
100%
Right Channel
Left Channel
Mute
200h
000h
1FFh
I²C Control (10 bits)
4.14 Soft Mute Control
The Digital Soft Mute is applied smoothly (20 ms for 120 dB range) to avoid any switch noise on
output. It is available on all output channels pairs:
● S/PDIF channel (Left/Right)
● SCART channels (Left/Right)
● Loudspeakers channels (Left/Right)
● Center
● Subwoofer
● Headphone/Surround channels (Left/Right)
Another soft mute (analog) is also available on each DAC output.
4.15 Beeper
The beeper is used to generate a tone on the Loudspeakers or/and Headphone outputs. The
beeper sound (square wave) is added to the audio signal which is attenuated by 20 dB. The beep
sound amplitude includes a smooth attack and decay to avoid any parasitic noise when starting and
stopping.
It can be used for various applications such as beep sounds for remote control, alarm clock or other
features.
The Beeper operates in one of two modes:
● Pulse mode (beep applications): A tone with a programmable short duration (0.1, 0.25, 0.5
and 1.0 s) is generated. Afterwards, the beeper is automatically disabled and the output is
switched back to the audio signal, see Figure 21.
● Continuous mode (alarm application): A tone with a programmable long duration is
generated. Its start and stop controls must be programmed by I²C, see Figure 22.
The Beeper function is enabled by setting the BEEPER_ON bit in register BEEPER_ON.
Beeper parameters are controlled in register BEEPER_MODE.
The beeper tone level and frequency are programmed in register BEEPER_FREQ_VOL. The level
(or volume) ranges between 0 dB and -93 dB in steps of 3 dB and the tone frequency ranges
between 62.2 Hz and 8 kHz in steps of 1 octave.
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