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STA328

7.1.3

Thermal Warning Recovery Bypass

If the Thermal Warning Adjustment is enabled (TWAB=0), then the Thermal Warning Recovery will deter-

mine if the adjustment is removed when Thermal Warning is negative. If TWRB=0 and TWAB=0, then

when a thermal warning disappears the gain adjustment determined by the Thermal Warning Post-

Scale(default = -3dB) will be removed and the gain will be added back to the system. If TWRB=1 and

TWAB=0, then when a thermal warning disappears the Thermal Warning Post-Scale gain adjustment will

remain until TWRB is changed to zero or the device is reset.

7.1.4

Thermal Warning Adjustment Bypass

The on-chip STA328 Power Output block provides feedback to the digital controller using inputs to the

Power Control block. The TWARN input is used to indicate a thermal warning condition. When TWARN

is asserted (set to 0) for a period greater than 400ms, the power control block will force an adjustment to

the modulation limit in an attempt to eliminate the thermal warning condition. Once the thermal warning

volume adjustment is applied, whether the gain is reapplied when TWARN is de-asserted is dependent

on the TWRB bit.

7.1.5

Fault Detect Recovery Bypass

The DDX Power block can provide feedback to the digital controller using inputs to the Power Control

block. The FAULT input is used to indicate a fault condition (either over-current or thermal). When FAULT

is asserted (set to 0), the power control block will attempt a recovery from the fault by asserting the tri-

state output (setting it to 0 which directs the power output block to begin recovery). It holds it at 0 for period

of time in the range of .1ms to 1 second as defined by the Fault-Detect Recovery Constant register (FDRC

registers 29-2Ah), then toggle it back to 1. This sequence is repeated as log as the fault indication exists.

This feature is enabled by default but can be bypassed by setting the FDRB control bit to 1.

7.2 CONFIGURATION REGISTER B (Address 01h)

7.2.1

Serial Audio Input Interface Format

BIT

R/W

RST

NAME

DESCRIPTION

5

R/W

1

TWRB

Thermal-Warning Recovery Bypass:

0 – Thermal warning Recovery enabled

1 – Thermal warning Recovery disabled

BIT

R/W

RST

NAME

DESCRIPTION

6

R/W

1

TWAB

Thermal-Warning Adjustment Bypass:

0 – Thermal warning adjustment enabled

1 – Thermal warning adjustment disabled

BIT

R/W

RST

NAME

DESCRIPTION

7

R/W

0

FDRB

Fault Detector Recovery Bypass:

0 – Fault Detector Recovery enabled

1 – Fault Detector Recovery disabled

D7

D6

D5

D4

D3

D2

D1

D0

C1IM

C1IM

DSCKE

SAIFB

SAI3

SAI2

SAI1

SAI0

1

0

0

0

00

00

BIT

R/W

RST

NAME

DESCRIPTION

3…0

R/W

0000

SAI (3...0)

Serial Audio Input Interface Format: Determines the interface format of

the input serial digital audio interface.