STA339BW datasheet(35/78 Pages) STMICROELECTRONICS

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STA339BW

7.3.3

Overcurrent warning detect adjustment bypass

The OCWARN input is used to indicate an overcurrent 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 overcurrent warning condition. Once the

overcurrent 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 /

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

7.4

Configuration register D (addr 0x03)

7.4.1

High-pass filter bypass

The STA339BW 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 FFX amplifier. DC

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

7.4.2

De-emphasis

Table 28. Overcurrent warning bypass

Bit

R/W

RST

Name

Description

R/W

OCRB

0: overcurrent warning adjustment enabled

1: overcurrent warning adjustment disabled

SME

ZDE

DRC

BQL

PSL

DSPB

DEMP

HPB

01000000

Table 29. High-pass filter bypass

Bit

R/W

RST

Name

Description

R/W

HPB

Setting of one bypasses internal AC coupling digital

high-pass filter

Table 30. De-emphasis

Bit

R/W

RST

Name

Description

R/W

DEMP

0: No de-emphasis

1: Enable de-emphasis on all channels

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