I2C bus interface

TDA7575B

18/32

Doc ID 14103 Rev 3

5.6

I2C abilitation setting

It is possible to disable the I2C interface by acting on I2C pin (pin 16) and control the

TDA7575B by means of the usual standby and mute pins. In order to activate or deactivate

this feature, I2C pin must be set as follows:

●

I2C pin (pin 16) < 1.5V: I2C bus interface deactivated

●

I2C pin (pin 16) > 2.5V: I2C bus interface activated

It is also possible to let I2C pin floating to deactivate the I2C bus interface, or to short I2C pin

to VCC to activate it.

In particular:

●

I2C enabled: I2C pin (pin 16) > 2.5 V

–

STD mode: Vst-by (pin 5) > 3.5 V, IB2(D1)=0

–HE mode: Vst-by (pin 5) > 3.5 V, IB2(D1)=1

–

Play mode: Vmute (pin 4) >3.5 V, IB1 (D2) = 1

The amplifier can always be switched off by putting Vst-by to 0V , but with I

2C enabled it can

be turn on only through I2C (with Vst-by > 3.5 V).

●

I2C disabled: I2C pin (pin 16) < 1.5 V

–

STD mode: 3.5V < standby (pin 5) < 5

–HE mode: Vstby (pin 5) > 7 V

–

Play mode: Vmute (pin 4) > 3.5 V

For both STD and HE mode the play/mute mode can be set acting on Vmute pin.

When I2C bus is disabled, when a fault is detected pin 14 (CD-OUT) is pulled down by the

internal logic circuitry. The faults detected are the short circuit to ground, to VCC and across

the load (after an aver current detection).