TDA7342_06 Datasheet, PDF (14/20 Pages) STMicroelectronics – Digitally controlled audio processor

Software specification
TDA7342
Table 8. Loudness
MSB
LSB
D7
D6
D5
D4
D3
D2
D1
D0
Function
X
X
X
0
0
0
0
0
0dB
X
X
X
0
0
0
0
1
-1.25dB
X
X
X
0
0
0
1
0
-2.5dB
X
X
X
0
0
0
1
1
-3.75dB
X
X
X
0
0
1
0
0
-5dB
X
X
X
0
0
1
0
1
-6.25dB
X
X
X
0
0
1
1
0
-7.5dB
X
X
X
0
0
1
1
1
-8.75dB
X
X
X
0
1
0
0
0
-10dB
X
X
X
0
1
0
0
1
-11.25dB
X
X
X
0
1
0
1
0
-12.5dB
X
X
X
0
1
0
1
1
-13.75dB
X
X
X
0
1
1
0
0
-15dB
X
X
X
0
1
1
0
1
-16.25dB
X
X
X
0
1
1
1
0
-17.5dB
X
X
X
0
1
1
1
1
-18.75dB
X
X
X
1
D3
D2
D1
D0
Loudness OFF (1)
For example to select -17.5dB attenuation, loudness OFF, the Data Byte is: X X X1 1 1 1 0
NOTE 1: If the loudness is switched OFF, the loudness stage is acting like a volume attenuator with flat
frequency response. D0 to D3 determine the attenuation level.
Table 9. Mute
MSB
LSB
D7 D6 D5 D4 D3 D2 D1 D0
Function
1 Soft mute on
0
1 Soft mute with fast slope (I = I_MAX)
1
1 Soft mute with slow slope (I = I_MIN)
1
Direct mute
0
1
Zero crossing mute on
0
0
Zero crossing mute off
(delayed until the next zerocrossing)
1
Zero crossing mute and pause detector
reset
0
0
160mV ZC Window threshold (WIN = 00)
0
1
80mV ZC Window threshold (WIN = 01)
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