STA381BWSTR STMicroelectronics, STA381BWSTR Datasheet - Page 145

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

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

STA381BWS
7.17
Note:
EQ soft volume configuration registers (addr 0x37 - 0x38)
The soft volume update has a fixed rate by default. Using register 0x37 and 0x38 it is
possible to override the default behavior, allowing different volume change rates.
It is also possible to independently define the fade-in (volume is increased) and fade-out
(volume is decreased) rates according to the desired behavior.
Table 160. Soft volume update enable, increase
When SVUPE = 1 the volume-up rate is defined by the SVUP[4:0] bits according to the
following formula:
where N is the SVUP[4:0] value.
Table 161. Soft volume update enable, decrease
When SVDWE = 1 the volume-down rate is defined by the SVDW[4:0] bits according to the
following formula:
where N is the SVDW[4:0] value.
For volume-down rates greater than 6 dB/msec it is recommended to disable the CPWMEN
bit and ZCE bit in order to avoid any audible pop noise.
Reserved
Reserved
D7
D7
volume-up rate = 48 / (N + 1) dB/ms
volume-down rate = 48 / (N + 1) dB/ms
0
0
SVDWE
SVUPE
0
1
0
1
Reserved
Reserved
D6
D6
0
0
SVDWE
SVUPE
When volume is increased, use the default rate
When volume is increased, use the rates defined by SVUP[4:0].
When volume is decreased, use the default rate
When volume is decreased, use the rates defined by SVDW[4:0].
D5
D5
0
0
Doc ID 018937 Rev 6
Register description: Sound Terminal compatibility
SVUP[4]
SVDW4]
D4
D4
0
0
SVDW[3]
SVUP[3]
D3
D3
0
0
Mode
Mode
SVDW[2]
SVUP[2]
D2
D2
0
0
SVDW[1]
SVUP[1]
D1
D1
0
0
SVDW[0]
SVUP[0]
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D0
D0
0
0