sta333bwqs13tr STMicroelectronics, sta333bwqs13tr Datasheet - Page 43

• Manufacturer Part Number: sta333bwqs13tr
• Description: 2.1-channel High-efficiency Digital Audio System With Qsound Qhd
• Manufacturer: STMicroelectronics

STA333BWQS
The master mute, when set to 1, mutes all channels at once, whereas the individual channel
mutes (CxM) mutes only that channel. Both the master mute and the channel mutes provide
a “soft mute” with the volume ramping down to mute in 4096 samples from the maximum
volume setting at the internal processing rate (~96 kHz).
A “hard mute” can be obtained by putting a value of 0xFF (255) to any channel volume
register or the master volume register. When volume offsets are provided via the master
volume register any channel that whose total volume is less than –80 dB is muted.
All changes in volume take place at zero-crossings when ZCE = 1 (configuration register F)
on a per channel basis as this creates the smoothest possible volume transitions. When
ZCE=0, volume updates occur immediately.
Table 53.
Table 54.
11011010 (0xDA)
11101100 (0xEC)
11101101 (0xED)
01001100 (0x4C)
11111110 (0xFE)
11111111 (0xFF)
01011111 (0x5F)
11010111 (0xD7)
11011000 (0xD8)
11011001 (0xD9)
00000000 (0x00)
00000001 (0x01)
00000010 (0x02)
00000000 (0x00)
00000001 (0x01)
00000010 (0x02)
01100000 (0x60)
01100001 (0x61)
CxV[7:0]
MV[7:0]
…
…
…
…
…
Master volume offset as a function of MV[7:0
Channel volume as a function of CxV
Volume offset from channel value
Hard channel mute
Hard master mute
-127.5 dB
+47.5 dB
-59.5 dB
Volume
+0.5 dB
-0.5 dB
+48 dB
+47 dB
-0.5 dB
-38 dB
-60 dB
-61 dB
-62 dB
-80 dB
[
-1 dB
7:0
0 dB
0 dB
…
…
…
…
…
]
]
Register description
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