STA339BWS datasheet(31/79 Pages) STMICROELECTRONICS

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STA339BWS

Overcurrent warning adjustment bypass

The OCRB is used to indicate how STA339BWS behaves when an overcurrent warning

condition occurs. If OCRB = 0 and the overcurrent condition happens, 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 clipping

adjustment is applied, it remains in this state until reset is applied or OCRB is set to 1. The

level of adjustment can be changed via the TWOCL (thermal warning/overcurrent limit)

setting at address 0x37 of the user defined coefficient RAM (Section 7.7.7 on page 59). The

OCRB can be enabled when the output bridge is already on.

7.1.4

Configuration register D (addr 0x03)

High-pass filter bypass

The STA339BWS 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.

Table 25. Compensating pulse size

CSZ[3:0]

Compensating pulse size

0000

0 ns (0 tick) compensating pulse size

0001

20 ns (1 tick) clock period compensating pulse size

……

1111

300 ns (15 tick) clock period compensating pulse size

Table 26. 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

Table 27. High-pass filter bypass

Bit

R/W

RST

Name

Description

R/W

HPB

1: bypass internal AC coupling digital high-pass filter

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