4.4

Mode selection

The three operating modes of the TDA7492PE are set by two inputs: STBY (pin 20) and MUTE (pin 21).

•

Standby mode: all circuits are turned off, very low current consumption.

•

Mute mode: inputs are connected to ground and the positive and negative PWM outputs are at 50% duty

cycle

•

Play mode: the amplifiers are active.

The protection functions of the TDA7492PE are implemented by pulling down the voltages of the STBY and

MUTE inputs shown in Figure 6. Standby and mute circuits. The input current of the corresponding pins must be

limited to 200 µA.

Table 11. Mode settings

Mode

STBY

MUTE

Standby

L(1)

X (do not care)

Mute

H

L

Play

H

H

1. Drive levels defined in Table 4. Electrical specifications.

Figure 5. Standby and mute circuits

Standby

Mute

33 kΩ

33 kΩ

2.2 µF

2.2 µF

STBY

MUTE

20

21

TDA7492PE

3.3 V

3.3 V

0 V

0 V

R 2

R4

C7

C15

TDA7492PE

Mode selection

DS10652 - Rev 3

page 10/19