TDA7803A datasheet(30/72 Pages) STMICROELECTRONICS

30 / 72 page

Functional description

TDA7803A

30/72

DS12195 Rev 7

only the channel(s) where the fault happened is shut down. Once activated, the

diagnostic procedure develops as below:

–

The diagnostic performs one restart cycle in order to avoid momentary re-

circulation spikes which could give erroneous results. If a normal state (no

overloads) is detected, the channel returns back active.

–

Instead, if after the restart cycle, the overload is still detected, then the diagnostic

performs a plateau cycle.

–

After the plateau cycle, a restart cycle is going to be performed every 2 ms until

the fault condition is removed. The data acquired from the plateau cycle are stored

and can be read from the microprocessor. If the fault condition persists, a new

plateau cycle can be programmed from I2C simply by reading. This ensures

continuous diagnostic throughout the car-radio operating time.

For a more immediate understanding, the permanent diagnostic's flowchart is as in

Figure 36.

Figure 36. Permanent diagnostic flow-chart

When a plateau cycle is done during the permanent diagnostic the bit DB1/2/3/4-D4 is set to

"1". If all the bits related to the diagnostic are "0", then the fault has possibly been removed

or not detected. Eventually, an over current event could have been occurred on a

GAPGPS00810

PLAY

MODE

OVERLOAD

YES

TURN-OFF

BIG

POWERS

RESTART

CYCLE

FAULT

DETECTED

YES

FIRST CYCLE

AND IB4 D0 = ‘1’

PLATEAU

CYCLE

YES

RESTART

CYCLE

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