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參數(shù)資料
| 型號： | TDA7476013TR |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 消費家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PDSO24 |
| 封裝： | SOP-24 |
| 文件頁數(shù)： | 5/22頁 |
| 文件大小： | 377K |
| 代理商： | TDA7476013TR |
13/19
TDA7476
READ BYTE 1
READ BYTE 2
READ BYTE 3
Repetitive turn-on diagnostic
During the turn-on diagnostic, the TDA7476 can reveal false "short circuit across load" and/or false "open load"
due to noise sources such as door slams.
This problem can be solved doing more than one turn-on diagnostic routine. If the
P asks for N times the state
of the audio system, it has to consider a fault as really present only if it is detected in all the N turn-on diagnos-
tic.As above explained, the first time the TDA7476 receivers the byte ADD1, it does the turn-on diagnostic; then
each time it is addessed with ADD1, it does the permanent diagnostic. This is not true if, when the
P sends for
the first time the byte ADD2, it does not send to the TDA7476 the acknowledge after it has received the byte
BYTE3. In this case, the TDA7476 does not switch from turn-on to permanent diagnostic mode so if it receives
again the byte ADD1 it works as it was the first time that it does the turn-on diagnostic. In order to do repetitive
turn-on diagnostic, the mP has to be programmed as following:
s
Step 1: the
P sends ADD1
s
Step 2: the
P waits Twait1 seconds
s
Step 3: the
P sends ADD2, receives BYTE1, BYTE2, BYTE3, does not send the acknowlegde after
BYTE3
MSB
LSB
STATUS
D7
D6
D5
D4
D3
D2
D1
D0
0
X
1
X
0
CH1 short circuit to Vs
0
X
1
0
X
CH1 short circuit to GND
00
X
1
111
00
X
1
111
0
X
0
1
X
CH2 short circuit to Vs
0
X
1
X
CH2 short circuit to GND
00
111
1
X
00
111
1
X
1
X
1
X
0
CH3 short circuit to Vs
1
X
1
0
X
CH3 short circuit to GND
11
X
1
111
11
X
1
111
1
X
0
1
X
CH4 short circuit to Vs
1
0
X
1
X
CH4 short circuit to GND
11
111
1
X
11
111
1
X
1
X
1
0
AUX1 short circuit to GND
1
X
0
1
AUX1 open load
1
X
1
0
X
AUX2 short circuit to GND
1
X
0
1
X
AUX2 open load
1
X
0
X
CH5 short circuit to Vs
1
0
X
CH5 short circuit to GND
11
X
11
X
START
ADD1
ACK
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