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STA382BWSTR датащи(PDF) 95 Page - STMicroelectronics

номер детали STA382BWSTR
подробное описание детали  Sound Terminal 2.1-channel high-efficiency digital audio system
PDF  172 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STA382BWSTR датащи(HTML) 95 Page - STMicroelectronics

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STA382BWS
Register description: New Map
Doc ID 022784 Rev 1
95/172
6.32
Enhanced zero-detect mute and input level measurement
(address 0x61-0x65, 0x3F, 0x40, 0x6F)
The STA382BWS implements an RMS-based zero-detect function (on serial input interface
data) able to detect in a very reliable way the presence of an input signal, so that the power
bridge outputs can be automatically connected to ground.
When active, the function will mute the output PWM when the input level becomes less than
“threshold - hysteresis”. Once muted, the PWM will be unmuted when the input level is
detected greater than “threshold + hysteresis”.
The measured level is then reported (for each input channel) on registers ZCCCFG1 -
ZCCCFG2, ZCCCFG3 - ZCCCFG4 according to the following equation:
Value_in_dB = 20*Log10(Reg_value/(2
16*0.635))
D7
D6
D5
D4
D3
D2
D1
D0
WTHH
WTHL
FINETH
HSEL[1:0]
ZMTH[2:0]
00
00
01
1
1
D7
D6
D5
D4
D3
D2
D1
D0
RMS_CH0[7:0]
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
D7
D6
D5
D4
D3
D2
D1
D0
RMS_CH0[15:8]
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
D7
D6
D5
D4
D3
D2
D1
D0
RMS_CH1[7:0]
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
D7
D6
D5
D4
D3
D2
D1
D0
RMS_CH1[15:8]
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
Table 89.
Zero-detect threshold
ZMTH[2:0]
Equivalent input level (dB)
000
-78
001
-84
010
-90
011
-96
100
-102
101
-108
110
-114
111
-114
Obsolete
Product(s)
- Obsolete
Product(s)



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