TDA7803A-QLX datasheet(22/72 Pages) STMICROELECTRONICS

22 / 72 page

Operation states

TDA7803A

22/72

DS12195 Rev 7

Operation states

TDA7803A functionality is regulated by means of a finite state machine.

Finite state machine diagram is reported in Figure 29.

Main states are:



Standby



ECO-mode



Amplifier mode



Turn-on diagnostic



Permanent diagnostic

4.1

Standby state

When STBY pin is under VILSTBY voltage the amplifier is in stand-by state and the current

consumption is very low.

4.2

ECO-mode state

When STBY pin is over VIHSTBY the amplifier is in a state of low current absorption, the

ECO-mode. The short circuit protections are active and the amplifier is ready for receiving

commands from micro-controller through I2C interface.

Outputs and A3V3 supply are biased at 0 V.

4.3

Amplifier-mode state

When TDA7803A is in ECO-mode state, IB7-d0 is set to "1", (Amplifier-ON), and I2S clock is

present the amplifier moves to Amplifier-mode state.

The outputs are biased from 0 V to Vcc/2 and the current consumption reaches "Iq" level

until the amplifier is set in MUTE or in PLAY with low level signal. User can move the

amplifier from MUTE to PLAY and viceversa acting on IB2-d4, d3 bits.

A hardware unmute pin is available in PSO36 package only.

4.4

Turn-on and permanent diagnostic

TDA7803A provides a powerful and precise diagnostic both with speaker and line driver

loads.

There are two main diagnostic states:



Turn-on diagnostic



Permanent diagnostic.

The Turn-on diagnostic could be run in ECO-mode state and is suggested for sensing the

presence of faults before amplifier turn-on, in order to avoid unwanted or dangerous

conditions due to wrong connections or absence of load.

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