sta339bw STMicroelectronics, sta339bw Datasheet - Page 69

• Manufacturer Part Number: sta339bw
• Description: 2.1-channel High-efficiency Digital Audio System
• Manufacturer: STMicroelectronics

STA339BW
6.18.5
Note:
6.19
Extended BIQUAD selector
De-ephasis filter as well as bass and treble controls can be configured as user defined filters
when equalization coefficients link is activated (BQL = 1) and the corresponding BQx bit is
set to 1.
Table 80.
Table 81.
Table 82.
When filters from 5th to 7th are configured as user-programmable, the corresponding
coefficients are stored respectively in addresses 0x20-0x24 (BQ5), 0x25-0x29 (BQ6), 0x2A-
0x2E (BQ7) as in
BQx bits are ignored if BQL = 0 or if DEMP = 1 (relevant for BQ5) or CxTCB = 1 (relevant for
BQ6 and BQ7).
EQ soft volume configuration registers (addr 0x37 - 0x38)
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.
0
1
0
1
0
1
D7
D7
0
0
Reserved
Reserved
BQ5
BQ6
BQ7
De-emphasis filter setup
Bass filter setup
Treble filter setup
D6
D6
0
0
Table
72.
SVDWE
SVUPE
Pre-set de-emphasis filter selected
User defined biquad 5 coefficients are selected
Pre-set bass filter selected as per
User defined biquad 6 coefficients are selected
Pre-set treble filter selected as per
User defined biquad 7 coefficients are selected
D5
D5
0
0
Doc ID 15251 Rev 4
SVUP[4]
SVDW4]
D4
D4
0
0
SVDW[3]
SVUP[3]
D3
D3
0
0
Mode
Mode
Mode
Table 65
Table 65
SVDW[2]
SVUP[2]
D2
D2
0
0
Register description
SVDW[1]
SVUP[1]
D1
D1
0
0
SVDW[0]
SVUP[0]
D0
D0
0
0
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