STA323W datasheet(36/71 Pages) STMICROELECTRONICS

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STA323W

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7.1.3

Thermal warning recovery bypass

If the thermal warning adjustment is enabled (TWAB=0), then the thermal warning recovery

determines 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 = -3 dB) is removed and the gain is applied to the

system. If TWRB=1 and TWAB=0, then when a thermal warning disappears, the thermal

warning post-scale gain adjustment remains until TWRB is changed to zero or the device is

reset.

7.1.4

Thermal warning adjustment bypass

The STA323W on-chip power output block provides feedback to the digital controller by the

power control block inputs. The TWARN input is used to indicate a thermal warning

condition. When TWARN is active (set to 0 for a period greater than 400 ms) the power

control block forces 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 inactive, depends on the TWRB bit.

7.1.5

Fault detect recovery bypass

The DDX power block provides 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 active (set to 0), the power control block attempts a recovery from

the fault by activating 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 0.1 ms to 1 second as

defined by the Fault-Detect Recovery Constant register (FDRC registers 29-2Ah), then

toggles it back to 1. This sequence is repeated as long as the fault indication exists. This

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

Table 17.

Thermal warning recovery bypass

Bit

R/W

RST

Name

Description

5R/W

TWRB

0: Thermal warning Recovery enabled

1: Thermal warning Recovery disabled

Table 18.

Thermal warning adjustment bypass

Bit

R/W

RST

Name

Description

6R/W

TWAB

0: thermal warning adjustment enabled

1: thermal warning adjustment disabled

Table 19.

Fault detect recovery bypass

Bit

R/W

RST

Name

Description

7R/W

FDRB

0: fault detector recovery enabled

1: fault detector recovery disabled

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