TAS2553_15 datasheet(38/58 Pages) TI

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TAS2553

SLAS978B – SEPTEMBER 2013 – REVISED FEBRUARY 2014

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7.5.16 Register 0x0E: Battery Tracking Limiter Attack Rate and Hysteresis Time

BIT

NAME

READ / WRITE

DEFAULT

DESCRIPTION

7-6

HYSTERESIS

R/W

Hysteresis before re-arming release time

00 = No hysteresis

01 = 4.36 mV hysteresis

10 = 13.08 mV hysteresis

11 = 30.52 mV hysteresis

R/W

Write to 1 during initialization. See Initialization.

4-3

APT_DIS_VOLTAGE

R/W

VBAT threshold below which Boost APT is disabled and the boost

remains active regardless of Class-D output voltage.

00 = 2.5 V

01 = 2.7 V

10 = 2.9 V

11 = 3.1 V

2-0

ATTACK_TIME

R/W

000

Attack Time

350 µs / dB per step

000 = 20 µs / dB

001 = 370 µs / dB

…

110 = 2120 µs / dB

111 = 2470 µs / dB

7.5.17 Register 0x0F: Battery Tracking Limiter Release Rate

READ /

BIT

NAME

DEFAULT

DESCRIPTION

WRITE

7-4

R/W

Reserved. Write only default values.

3-0

REL_TIME

R/W

0100

Release Time

105 ms / dB per step

0000 = 50 ms / dB

0001 = 155 ms / dB

…

1110 = 1520 ms / dB

1111 = 1625 ms / dB

7.5.18 Register 0x10: Battery Tracking Limiter Integration Count Control

Limiter integration affects how the AGC state machine interprets the AGC output voltage trigger threshold.

Increasing the integration count requires more AGC output peaks to exceed the limiter threshold before the

limiter changes its gain.

READ /

BIT

NAME

DEFAULT

DESCRIPTION

WRITE

7-6

UP_DWN_RATIO

R/W

Control Integration Count Up/Down Ratio

The UP_DWN_RATIO sets the ratio of the addition to and the subtraction

from the integration count, meaning that the input has to be below the limit

threshold for 4UP_DWN_RATIO counts before the integration count is reduced.

5-0

INT_CNT

R/W

00 0000

Integration Count Control Register

Larger values increase filtering before the attack and decay time are

triggered.

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