參數(shù)資料
型號(hào)： TDA7476
廠商： STMICROELECTRONICS
元件分類(lèi)： 消費(fèi)家電
英文描述： SPECIALTY CONSUMER CIRCUIT, PDSO24
封裝： SOP-24
文件頁(yè)數(shù)： 5/19頁(yè)
文件大小： 161K
代理商： TDA7476
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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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TDA7476_01 制造商:STMICROELECTRONICS 制造商全稱(chēng):STMicroelectronics 功能描述:CAR RADIO DIAGNOSTIC PROCESSOR
TDA7476013TR 功能描述:處理器 - 專(zhuān)門(mén)應(yīng)用 CAR RADIO DIAGNOSTIC RoHS:否 制造商:Freescale Semiconductor 類(lèi)型:Multimedia Applications 核心:ARM Cortex A9 處理器系列:i.MX6 數(shù)據(jù)總線寬度:32 bit 最大時(shí)鐘頻率:1 GHz 指令/數(shù)據(jù)緩存: 數(shù)據(jù) RAM 大小:128 KB 數(shù)據(jù) ROM 大小: 工作電源電壓: 最大工作溫度:+ 95 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:MAPBGA-432
TDA7478 制造商:STMICROELECTRONICS 制造商全稱(chēng):STMicroelectronics 功能描述:SINGLE CHIP RDS DEMODULATOR
TDA7478_11 制造商:STMICROELECTRONICS 制造商全稱(chēng):STMicroelectronics 功能描述:Single chip RDS demodulator
TDA7478D 制造商:STMICROELECTRONICS 制造商全稱(chēng):STMicroelectronics 功能描述:SINGLE CHIP RDS DEMODULATOR
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