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參數(shù)資料
| 型號： | TDA7476 |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | CAR RADIO DIAGNOSTIC PROCESSOR |
| 中文描述： | 汽車無線電診斷處理器 |
| 文件頁數(shù)： | 12/15頁 |
| 文件大?。?/td> | 101K |
| 代理商： | TDA7476 |
In this way only after that the TDA7476 has done for N times the turn-on diagnostic, it switches from
turn-onto permanentdiagnosticmode.
From now the TDA7476 alwaysdoes the permanentdiagnostic.
To save time when the audio system is switched on, it is possible to do the repetitive turn-on diagnostic
when the car-radio is turned off. In this case the steps to follow to do the repetitiveturn-on diagnosticare
the following:
1- to switch off the TDA7476 connectingSTBY pin to ground;
2- towaitT
5V
seconds(timenecessaryforthedischargeofthecapacitor).IfC
5V
=10
μ
FthenT
5V
=20mstyp;
3- to switch on the TDA7476
4- to do the repetitiveturn-on diagnosticas above described;
5- to turn off the TDA7476.
WARNING PIN
This is an open drain output pin that is activated when a fault condition is present for more than 2 sec
(TYP). The fault conditionsrelated to the warningpin areas follows:
- AUX1, AUX2
Shortto GND
- CH1, CH2, CH3, CH4, CH5:
ShortCircuit to GND
ShortCircuit to Vs
The purpose of this pin is to alert the
μ
P and start with the permanent diagnostic routine only if faults
are present,thus avoidingCPU’s waste of time.
APPLICATION NOTES
On single-ended devices as in figure 6, 7 if the loads are present then both in turn-on and in perma-
nent diagnosticthe fault present on one channelis pointed out forall the loads connectedtogether.
For example:
- seefig.6ifCH1+isshortedtoground,theTDA7476revealsashortto groundbothforCH2andforCH1.
- seefig.7ifCH1+isshortedtoground,theTDA7476detectsashortcircuittogroundforCH1,CH2, CH3, CH4.
To use the TDA7476 with a car-radio system which has less than five audio channel and less than
two auxiliaryloads, it is necessaryto take some cares:
- If the loadsare 4
speakers(Rcs= 3.3 K
), R
10
has to be connectedbetween CH+ and CH- of
eachchannel(see figg. 5,6,7,8 concerningCH5). R
5
has to be used if loads are 2
speakers
(Rcs=1.8 K
).
- If AUX1/AUX2are unused,Rsens1/Rsens2will not be needed. The AUX-IN pin(s) can be tied to the
5 internalregulator(pin 10) while setting the AUX-OUT pin(s) about 250mV lower than AUX-IN’s
(admissiblerange= 125mVto 500mV). This can easily be obtainedby means of a voltagedivider.
IfboththeAUXchannelsareunused,pins7-8(AUX-INs)andpins6-9(AUX-OUTs)canbe respectively
connectedtogether,so that a singlevoltagedivider could be used.
The above actions will prevent any ”warning” activation which might cause unwanted microprocessor’s
interrupt.
TDA7476
12/15
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| TDA7478 | TERMINAL |
| TDA7478D | TERMINAL |
| TDA7479 | SINGLE CHIP RDS DEMODULATOR FILTER |
| TDA7479D | SINGLE CHIP RDS DEMODULATOR FILTER |
| TDA7480 | 10W MONO CLASS-D AMPLIFIER |
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:STMicroelectronics 功能描述:CAR RADIO DIAGNOSTIC PROCESSOR |
| TDA7476013TR | 功能描述:處理器 - 專門應(yīng)用 CAR RADIO DIAGNOSTIC RoHS:否 制造商:Freescale Semiconductor 類型: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:STMicroelectronics 功能描述:SINGLE CHIP RDS DEMODULATOR |
| TDA7478_11 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Single chip RDS demodulator |
| TDA7478D | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:SINGLE CHIP RDS DEMODULATOR |
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