STA335BW datasheet(48/54 Pages) STMICROELECTRONICS

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STA335BW

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5.12.21

Over-current post-scale

The STA335BW 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 29.

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

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

Lo-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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