STA328 datasheet(22/57 Pages) STMICROELECTRONICS

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STA328

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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 400 ms, 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.

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 3-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 s

as defined by the fault-detect recovery constant register (FDRC registers 0x29 to 0x2A),

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.

Table 15.

Thermal warning adjustment bypass

Bit

R/W

RST

Name

Description

6RW

TWAB

Thermal warning adjustment bypass:

0: thermal warning adjustment enabled

1: thermal warning adjustment disabled

Table 16.

Fault detect recovery bypass

Bit

R/W

RST

Name

Description

7RW

FDRB

Fault detector recovery bypass:

0: fault detector recovery enabled

1: fault detector recovery disabled

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