TDA7566_06 Datasheet, PDF (25/28 Pages) STMicroelectronics – 4x40W multifunction quad power amplifier with built-in diagnostics features

TDA7566
7
Examples of bytes sequence
Examples of bytes sequence
1 - Turn-On diagnostic - Write operation
Start Address byte with D0 = 0
ACK
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 1ms
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
ACK
IB2
ACK STOP
XX1XX11X
XXX1X0XX
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
● 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.
● The delay from 4 to 5 can be selected by software, starting from 1ms
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
● 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.
● The delay from 6 to 7 can be selected by software, starting from 1ms.
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