E-TDA7476013TR STMicroelectronics, E-TDA7476013TR Datasheet
E-TDA7476013TR
Specifications of E-TDA7476013TR
Available stocks
Related parts for E-TDA7476013TR
E-TDA7476013TR Summary of contents
Page 1
... BCD Technology intended for car radio appli- cations able to detect potential faults coming S from any misconnection in the car radio or in the har- ness when installing the set. The device is able to reveal any fault in the loud- speaker lines and in the antenna and booster supply ...
Page 2
... Supply Voltage S 13 CSR Current setting resistor 14 T-CAP Timing capacitor 15/16 CH1+/CH1- Audio output - Channel 1 17/18 CH2-/CH2+ Audio output - Channel 2 19/20 CH3+/CH3- Audio output - Channel 3 21/22 CH4-/CH4+ Audio output - Channel 4 23/24 CH5+/CH5- Audio output - Channel 5 2/ ...
Page 3
... AUDIO INPUTS CH1, CH2, CH3, CH4, CH5 - TURN ON DIAGNOSTIC Pgnd Short to GND det. (below this limit, the Audio Output is considerd in Short Circuit to GND) Pvs Short to Vs det. (above this limit, the Audio Output is considered in Short Circuit to Vs) Pnop Normal operation thresholds. (Within these limits, the Audio Output is considered without ...
Page 4
... This condition must be true for a time higher than Tdel Pvs Short to Vs det. (above this limit the Audio Output is considered in Short Circuit to Vs) This condition must be true for a time higher than Tdel Pnop Normal operation thresholds. (Within these limits, the Audio Output is considered without ...
Page 5
... SAT WORKING PRINCIPLES Turn-on diagnostic - CH1, CH2, CH3, CH4, CH5 - Shorted load/open load detection To detect a short across the load or an open load, a subsonic current pulse is generated. The information related to the status of the outputs is measured and memorized at the top of the current pulse (tm in fig.1). The current is sourced by the positive pins (CH1+, ...
Page 6
... To detect if there is short circuit to GND or Vs, the subsonic current pulse is exploited. The information related to the status of the outputs are measured and memorized at the top of the current pulse (tm in fig.1 faults are present, the pins connected to the audio outputs (CH1,..CH5) will reach about 3V.If one or more outputs are shorted to GND, these voltages become lower than 3V ...
Page 7
... This does not permit a correct measure of the short circuit resistor. Turn-on diagnostic - AUX1, AUX2 To detect if there is a short circuit to GND or an open load involving to the AUX output of the car radio, the volt- age across a sensing resistor Rsens is detected.These output voltages (for example for the active antenna and for the booster) are usually generated by high side drivers, but also voltage regulators with Vout > ...
Page 8
... The detection mode of the auxiliary inputs is equal to what is in place during turn-on, but the fault must be lasting without interruption for more than 2 seconds.The warning pin is pulled down only in case of short to GND. This is to avoid that this pin remains permanently to 0 level if one or both AUX outputs of the car radio are unused. ...
Page 9
... The minimum voltage of the AUX IN pin to sense the open load condition is 2V. The minimum voltage of the AUX IN pin to detect the short circuit to GND, by sensing the drop on the resistors is 4.5V. If this voltage falls below 2V, the AUX in is considered short circuited to GND. From ...
Page 10
... LOW state of the data line can only change when the clock signal on the SCL line is LOW. Start and Stop Conditions As shown by fig start condition is a HIGH to LOW transition of the SDA line while SCL is HIGH. The stop condition is a LOW to HIGH transition of the SDA line while SCL is HIGH. ...
Page 11
... S 010001A 0 The byte ADD2 contains the bit level. This enables the reading mode, TDA7476's. The 3 bytes with the diagnostic information BYTE1, BYTE2, BYTE3 (READ FROM TDA7476) are now transmitted to the P. The address of TDA7476 is selected using pin ADD (pin ADD is connected to ground, then and the TDA7476 address is 0100010X. ...
Page 12
... P and TDA7476 are the same as those in case of turn-on diagnostic (see above). Here following is the permanent diagnostic output Data Bytes. The bits D7 and D6 of the first byte both stand at 0 level. This condition, although not possible during the turn-on diagnostic, can be useful to confirm that the bytes are referred to the permanent diagnostic ...
Page 13
... 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 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 ...
Page 14
... ADD2 ACK In this way only after that the TDA7476 has done for N times the turn-on diagnostic, it switches from turn-on to permanent diagnostic mode.From now the TDA7476 always does the permanent diagnostic.To save time when the audio system is switched on 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 repetitive turn-on diagnostic are the following switch off the TDA7476 connecting STBY pin to ground ...
Page 15
... CH1+ is shorted to ground, the TDA7476 detects a short circuit to ground for CH1, CH2, CH3, CH4. About timing for the TDA7375, connected as in fig. Cout = 1000 F, and Ct = 100 F if Cout = 2200 F. If the circuit is as shown by fig. 8, the suggested values of Ct are as follows Cout = 1000 Cout = 2200 F. x ...
Page 16
... CH± not used has to be fixed each pin AUX1IN, AUX1OUT, AUXIN2, AUX2OUT not used has to be fixed to a voltage equal or greater than 5V The 5V voltage reference available on the chip (pin 10) is very useful to fix both CH± and AUX pins to 5V. ...
Page 17
... Figure 7. TDA7375 in S.E. mode with 4 output capacitors TDA7375 CH1+ CH2+ CH3+ CH4+ CH5+ D97AU575A Figure 8. TDA7375 in S.E. mode with 2 output capacitors TDA7375 CH1+ CH2+ CH3+ CH4+ CH5+ D97AU576A + - - + + - - + R CH5- CH4- CH3- CH2- CH1- TDA7476 + - - + + - - + R CH5- CH4- CH3- CH2- CH1- TDA7476 TDA7476 ...
Page 18
... H 10.0 10.65 0.394 h 0.25 0.75 0.010 k 0 (min.), 8 (max.) L 0.40 1.27 0.016 B 0.10mm .004 Seating Plane 18/19 inch MIN. TYP. MAX. 0.104 0.012 0.100 0.0200 0.013 0.614 0.299 0,050 0.419 0.030 0.050 OUTLINE AND MECHANICAL DATA SO24 h x 45˚ SO24 C ...
Page 19
... STMicroelectronics. The ST logo is a registered trademark of STMicroelectronics Australia - Brazil - China - Finland - France - Germany - Hong Kong - India - Italy - Japan - Malaysia - Malta - Morocco - Singapore - Spain 2001 STMicroelectronics - All Rights Reserved ® ...