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TDA7575 데이터시트(PDF) 11 Page - STMicroelectronics |
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TDA7575 데이터시트(HTML) 11 Page - STMicroelectronics |
11 / 17 page 11/17 TDA7575 Examples of bytes sequence 1 - Turn-On diagnostic - Write operation 2 - Turn-On diagnostic - Read operation The delay from 1 to 2 can be selected by software, starting from T.B.D. ms 3a - Turn-On of the power amplifier with mute on, diagnostic defeat. 3b - Turn-Off of the power amplifier 4 - Offset detection procedure enable 5 - Offset detection procedure stop and reading operation (the results are valid only for the offset detection bits (D2 of the bytes DB1, DB2, DB3, DB4). s The purpose of this test is to check if a D.C. offset (2V typ.) is present on the outputs, produced by input capacitor with anomalous leackage current or humidity between pins. s The delay from 4 to 5 can be selected by software, starting from T.B.D. ms DIAGNOSTICS FUNCTIONAL DESCRIPTION: a) TURN-ON DIAGNOSTIC. It is activated at the turn-on (stand-by out) under I 2C bus request. Detectable output faults are: –SHORT TO GND –SHORT TO Vs – SHORT ACROSS THE SPEAKER – OPEN SPEAKER To verify if any of the above misconnections are in place, a subsonic (inaudible) current pulse (fig. A) is internally generated, sent through the speaker(s) and sunk back.The Turn On diagnostic status is internally stored until a successive diagnostic pulse is requested (after a I2C reading). If the "stand-by out" and "diag. enable" commands are both given through a single programming step, the pulse takes place first (power stage still in stand-by mode, low, outputs= high impedance). Start Address byte with D0 = 0 ACK IB1 with D6 = 1 ACK IB2 ACK STOP Start Address byte with D0 = 1 ACK DB1 ACK DB2 ACK STOP Start Address byte with D0 = 0 ACK IB1 ACK IB2 ACK STOP X000XXXX XXX1XX1X Start Address byte with D0 = 0 ACK IB1 ACK IB2 ACK STOP X0XXXXXX XXX0XXXX Start Address byte with D0 = 0 ACK IB1 ACK IB2 ACK STOP XX1XX1XX XXX1XXXX Start Address byte with D0 = 1 ACK DB1 ACK DB2 ACK STOP |
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