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TDA7803A-QLX 데이터시트(PDF) 22 Page - STMicroelectronics

부품명 TDA7803A-QLX
상세설명  High efficiency digital input automotive quad power amplifier with built-in diagnostics features, start stop compatible
PDF  72 Pages
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제조업체  STMICROELECTRONICS [STMicroelectronics]
홈페이지  http://www.st.com
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TDA7803A-QLX 데이터시트(HTML) 22 Page - STMicroelectronics

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Operation states
TDA7803A
22/72
DS12195 Rev 7
4
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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