July 1994

11

Philips Semiconductors

Preliminary specification

2 x 22 W BTL car radio power amplifier

with diagnostic facility

TDA1551Q

Table 2

READ definition (R/W = HIGH)

Notes

2. HIGH after power-on reset.

3. LOW if crystal temperature < 150

°C.

4. HIGH if crystal temperature reaches 150

°C.

5. LOW if not clipping.

6. HIGH if one or more channels are clipping.

7. output status information.

If the device is sinewave driven bit D4 will be HIGH if the THD in one or more channels exceeds 3.5%.

Table 3

Fault conditions

If more outputs are in a fault condition (e.g. short-circuit) then more bits, D3 to D0, will be HIGH.

D6

DATA

MSB

D3

D2

D1

D0

FUNCTION

0

0

0

0

all output power transistors in the normal

safe operating condition

−−−

1

fault condition pin 6

−−

1

−

fault condition pin 8

−

1

−−

fault condition pin 10

1

−−

−

fault condition pin 12