TDA7566 Datasheet, PDF (17/19 Pages) STMicroelectronics – MULTIFUNCTION QUAD POWER AMPLIFIER WITH BUILT-IN DIAGNOSTICS FEATURES

Examples of bytes sequence
1 - Turn-On diagnostic - Write operation
Start
Address byte with D0 = 0
ACK
TDA7566
IB1 with D6 = 1 ACK
IB2
ACK STOP
2 - Turn-On diagnostic - Read operation
Start Address byte with D0 = 1 ACK DB1 ACK DB2 ACK DB3 ACK DB4 ACK STOP
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 26dB gain, mute on, diagnostic defeat.
Start Address byte with D0 = 0
ACK
IB1
ACK
IB2
X000000X
XXX1X0XX
ACK STOP
3b - Turn-Off of the power amplifier
Start Address byte with D0 = 0
ACK
IB1
X0XXXXXX
ACK
IB2
XXX0XXXX
ACK STOP
4 - Offset detection procedure enable
Start Address byte with D0 = 0
ACK
IB1
XX1XX11X
ACK
IB2
XXX1X0XX
ACK STOP
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).
Start Address byte with D0 = 1 ACK DB1 ACK DB2 ACK DB3 ACK DB4 ACK STOP
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
6 - Current detection procedure start (the AC inputs must be with a proper signal that depends on the type of
load)
Start Address byte with D0 = 0
ACK
IB1
ACK
IB2
ACK STOP
XX01111X
XXX1X1XX
7 - Current detection reading operation (the results valid only for the current sensor detection bits - D5 of the
bytes DB1, DB2, DB3, DB4).
Start Address byte with D0 = 1 ACK DB1 ACK DB2 ACK DB3 ACK DB4 ACK STOP
s During the test, a sinus wave with a proper amplitude and frequency (depending on the loudspeaker under
test) must be present. The minimum number of periods that are needed to detect a normal load is 5.
s The delay from 6 to 7 can be selected by software, starting from T.B.D. ms.
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