sta339bw STMicroelectronics, sta339bw Datasheet - Page 62

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

Register description
6.12.21
Table 72.
62/77
0
1
2
3
4
5
…
19
20
21
…
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
Index (decimal)
Over-current post-scale
The STA339BW provides a simple mechanism for reacting to over-current detection in the
power-block. When the ocwarn input is asserted, the over-current post-scale value is used
in place of the normal post-scale value to provide output attenuation on all channels. The
default setting provides 3 dB of output attenuation when ocwarn is asserted.
The amount of attenuation to be applied in this situation can be adjusted by modifying the
Over-current Post-scale value. As with the normal post-scale, this scaling value is a 24-bit
signed fractional multiplier, with 0x800000 = -1 and 0x7FFFFF = 0.9999998808. By default,
the over-current post-scale factor is set to
applied, it remains until the device is reset.
RAM block for biquads, mixing, scaling and bass management
0x00
0x01
0x02
0x03
0x04
0x05
…
0x13
0x14
0x15
…
0x27
0x28
0x29
0x2A
0x2B
0x2C
0x2D
0x2E
0x2F
0x30
0x31
0x32
0x33
0x34
0x35
Index (hex)
Channel 1 - Biquad 1
Channel 1 - Biquad 2
…
Channel 1 - Biquad 4
Channel 2 - Biquad 1
…
Channel 2 - Biquad 4
Channel 1/2 - Biquad 5
for XO = 000
Hi-pass 2
for XO≠000
Channel 3 - Biquad
for XO = 000
Low-pass 2
for XO≠000
Channel 1 - Pre-Scale
Channel 2 - Pre-Scale
Channel 1 - Post-Scale
Channel 2 - Post-Scale
RAM block setting
nd
Doc ID 15251 Rev 4
nd
Order filter
Order filter
0x5A9DF7
. Once the over-current attenuation is
C1H10(b1/2)
C1H11(b2)
C1H12(a1/2)
C1H13(a2)
C1H14(b0/2)
C1H20
…
C1H44
C2H10
C2H11
…
C2H44
C12H0(b1/2)
C12H1(b2)
C12H2(a1/2)
C12H3(a2)
C12H4(b0/2)
C3H0(b1/2)
C3H1(b2)
C3H2(a1/2)
C3H3(a2)
C3H4(b0/2)
C1PreS
C2PreS
C1PstS
C2PstS
Coefficient
0x000000
0x000000
0x000000
0x000000
0x400000
0x000000
…
0x400000
0x000000
0x000000
…
0x400000
0x000000
0x000000
0x000000
0x000000
0x400000
0x000000
0x000000
0x000000
0x000000
0x400000
0x7FFFFF
0x7FFFFF
0x7FFFFF
0x7FFFFF
STA339BW
Default