STA335BWS datasheet(58/68 Pages) STMICROELECTRONICS

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STA335BWS

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6.12.21

Over-current post-scale

The STA335BWS 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 0x5A9DF7. Once the over-current attenuation is

applied, it remains until the device is reset.

Table 31.

RAM block for biquads, mixing, scaling and bass management

Index (Decimal) Index (Hex)

Coefficient

Default

0x00

Channel 1, Biquad 1

C1H10(b1/2)

0x000000

0x01

C1H11(b2)

0x000000

0x02

C1H12(a1/2)

0x000000

0x03

C1H13(a2)

0x000000

0x04

C1H14(b0/2)

0x400000

0x05

Channel 1, Biquad 2

C1H20

0x000000

……

…

0x13

Channel 1, Biquad 4

C1H44

0x400000

0x14

Channel 2, Biquad 1

C2H10

0x000000

0x15

C2H11

0x000000

……

…

0x27

Channel 2, Biquad 4

C2H44

0x400000

0x28

Channel 1/2 - Biquad 5

for XO = 000

Hi-pass 2nd Order filter

for XO

≠000

C12H0(b1/2)

0x000000

0x29

C12H1(b2)

0x000000

0x2A

C12H2(a1/2)

0x000000

0x2B

C12H3(a2)

0x000000

0x2C

C12H4(b0/2)

0x400000

0x2D

Channel 3 - Biquad

for XO = 000

Low-pass 2nd Order filter

for XO

≠000

C3H0(b1/2)

0x000000

0x2E

C3H1(b2)

0x000000

0x2F

C3H2(a1/2)

0x000000

0x30

C3H3(a2)

0x000000

0x31

C3H4(b0/2)

0x400000

0x32

Channel 1, Pre-Scale

C1PreS

0x7FFFFF

0x33

Channel 2, Pre-Scale

C2PreS

0x7FFFFF

0x34

Channel 1, Post-Scale

C1PstS

0x7FFFFF

0x35

Channel 2, Post-Scale

C2PstS

0x7FFFFF

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