TDF8541THSLASHN2 datasheet(14/54 Pages) NXP

14 / 54 page

TDF8541

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Product data sheet

Rev. 3 — 13 December 2011

14 of 54

NXP Semiconductors

TDF8541

I2C-bus controlled 4

 45 W power amplifier

7.5.1 Start-up diagnostics with DC load detection

If the start-up diagnostics are enabled, the load condition of all four channels is

determined. At the end of the start-up diagnostics cycle, not only the load condition is

known (shorted load, normal load or open load), but also if a separate amplifier is

connected or if the outputs are shorted to battery or ground. If a separate amplifier

(booster) is detected, the amplifier can start-up in line driver mode (low gain setting).

The load diagnostic is insensitive to door-slam (slowly moving speaker due to slamming of

the car door) and to external interference such as crosstalk of relays switching in the

wiring harness; see Figure 10.

Table 4.

Diagnostic information on pins DIAG and STB

Diagnostic

information

I2C-bus mode

Legacy mode

DIAG pin

STB pin

DIAG pin

Power-On Reset

(POR)

after POR, pin DIAG

remains LOW until

amplifier starts (inverse

of start-up bit)

Low battery

yes

Clip detection

can be enabled per

channel; can be

enabled by IB1[D7] if

below VP =10V;

default is ‘blocked’

can be enabled per

channel; can be

enabled by IB1[D7] if

below VP =10 V;

default is ‘blocked’

yes; fixed level for all

channels at 2 %;

blocked for VP < 10 V

Temperature pre-

warning

can be enabled;

default: Tj(AV)(pwarn) =

160 C

yes, pre-warning level

Tj(AV)(pwarn) =

160 C

Short

can be enabled; default

is enabled

yes

Speaker fault detection no

Offset detection

Load detection

Overvoltage protection

(20 V)

yes

Overvoltage

pre-warning (16 V)

can be enabled; default

is disabled

Maximum temperature

protection (active)

yes

Start-up diagnostics

indication

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