STA335BW datasheet(25/54 Pages) STMICROELECTRONICS

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STA335BW

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5.3.3

Over-current warning detect adjustment bypass

The OCWARN input is used to indicate an over-current warning condition. When OCWARN

is asserted (set to 0), the power control block forces an adjustment to the modulation limit

(default is -3 dB) in an attempt to eliminate the over-current warning condition. Once the

over-current warning volume adjustment is applied, it remains in this state until reset is

applied. The level of adjustment can be changed via the TWOCL (thermal warning/over

current limit) setting which is address 0x37 of the user defined coefficient RAM.

5.4

Configuration register D (address 0x03)

5.4.1

High-pass filter bypass

The STA335BW features an internal digital high-pass filter for the purpose of AC coupling.

The purpose of this filter is to prevent DC signals from passing through a DDX amplifier. DC

signals can cause speaker damage. When HPB=0, this filter is enabled.

5.4.2

De-emphasis

Setting the DEMP bit enables de-emphasis on all channels

5.4.3

DSP bypass

Setting the DSPB bit bypasses the EQ functionality of the STA335BW.

Bit

R/W

RST

Name

Description

R/W

OCRB

0 – Over-Current warning Adjustment enabled

1 – Over-Current warning Adjustment disabled

MME

ZDE

DRC

BQL

PSL

DSPB

DEMP

HPB

100

Bit

R/W

RST

Name

Description

0R/W

HPB

Setting of one bypasses internal AC coupling digital

high-pass filter

Bit

R/W

RST

Name

Description

1R/W

DEMP

0 – No de-emphasis

1 – De-emphasis

Bit

R/W

RST

Name

Description

R/W

DSPB

0 – Normal operation

1 – Bypass of biquad and bass/treble functionality

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