STA381BWSTR STMicroelectronics, STA381BWSTR Datasheet - Page 94

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STA381BWSTR

Manufacturer Part Number
STA381BWSTR
Description
Audio DSPs Sound Terminal 2.1 High EFF Dig Audio
Manufacturer
STMicroelectronics
Datasheet

Specifications of STA381BWSTR

Product Category
Audio DSPs
Rohs
yes
Operating Supply Voltage
4.5 V to 25.5 V
Operating Temperature Range
0 C to + 150 C
Mounting Style
SMD/SMT
Package / Case
VQFN-48
Snr
100 dB

Available stocks

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Part Number:
STA381BWSTR
Manufacturer:
ST
0
Register description: New Map
6.32
94/171
Enhanced zero-detect mute and input level measurement
(address 0x61-0x65, 0x3F, 0x40, 0x6F)
The STA381BWS 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*Log
Table 88.
WTHH
N/A
N/A
N/A
N/A
D7
D7
D7
D7
D7
0
ZMTH[2:0]
000
001
010
011
100
101
110
111
Zero-detect threshold
WTHL
N/A
N/A
N/A
N/A
D6
D6
D6
D6
D6
0
10
(Reg_value/(2
FINETH
N/A
N/A
N/A
N/A
D5
D5
D5
D5
D5
0
Doc ID 018937 Rev 6
16
N/A
N/A
N/A
N/A
D4
D4
D4
D4
D4
0
RMS_CH0[15:8]
RMS_CH1[15:8]
RMS_CH0[7:0]
RMS_CH1[7:0]
*0.635))
HSEL[1:0]
Equivalent input level (dB)
N/A
N/A
N/A
N/A
D3
D3
D3
D3
D3
0
-102
-108
-114
-114
-78
-84
-90
-96
N/A
N/A
N/A
N/A
D2
D2
D2
D2
D2
1
ZMTH[2:0]
N/A
N/A
N/A
N/A
D1
D1
D1
D1
D1
1
STA381BWS
N/A
N/A
N/A
N/A
D0
D0
D0
D0
D0
1

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