STA339BWS datasheet(26/79 Pages) STMICROELECTRONICS

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STA339BWS

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DocID015276 Rev 8

The STA339BWS has variable interpolation (oversampling) settings such that internal

processing and FFX output rates remain consistent. The first processing block interpolates

by either 2-times or 1-time (pass-through) or provides a 2-times downsample. The

oversampling ratio of this interpolation is determined by the IR bits.

Thermal warning recovery bypass

This bit sets the behavior of the IC after a thermal warning disappears. If TWRB is enabled

the device automatically restores the normal gain and output limiting is no longer active. If it

is disabled the device keeps the output limit active until a reset is asserted or until TWRB set

to 0. This bit works in conjunction with TWAB

Thermal warning adjustment bypass

Bit TWAB enables automatic output limiting when a power stage thermal warning condition

persists for longer than 400ms. When the feature is active (TWAB = 0) the desired output

limiting, set through bit TWOCL (-3 dB by default) at address 0x37 in the RAM coefficients

bank, is applied. The way the limiting acts after the warning condition disappears is

controlled by bit TWRB.

Table 13. IR bit settings as a function of input sample rate

Input sample rate fs (kHz)

1st stage interpolation ratio

2-times oversampling

44.1

2-times oversampling

88.2

Pass-through

176.4

2-times downsampling

192

2-times downsampling

Table 14. Thermal warning recovery bypass

Bit

R/W

RST

Name

Description

R/W

TWRB

0: thermal warning recovery enabled

1: thermal warning recovery disabled

Table 15. Thermal warning adjustment bypass

Bit

R/W

RST

Name

Description

R/W

TWAB

0: thermal warning adjustment enabled

1: thermal warning adjustment disabled

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