TDA7566 4x40W multifunction quad power amplifier with built-in diagnostics features Features ■ DMOS power output ■ High output power capability 4x25W/4Ω @ 14.4V, 1KHZ, 10% THD, 4x40W max. power ■ Max. output power 4x60W/2Ω ■ Full I2C bus driving: – St-by – Independent front/rear soft play/mute – Selectable gain 26dB - 12dB – I2C bus digital diagnostics ■ Full fault protection ■ DC offset detection ■ Four independent short circuit protection ■ Clipping detector (1%/10%) ■ ESD protection Flexiwatt 25 Thanks to the DMOS output stage the TDA7566 has a very low distortion allowing a clear powerful sound. Description This device is equipped with a full diagnostics array that communicates the status of each speaker through the I2C bus. The TDA7566 is a new BCD technology QUAD BRIDGE type of car radio amplifier in Flexiwatt25 package specially intended for car radio applications. The possibility to control the configuration and behaviour of the device by means of the I2C bus makes TDA7566 a very flexible machine. Order codes Part number Package Packing TDA7566 Flexiwatt 25 Tube December 2006 Rev 3 1/28 www.st.com 1 Contents TDA7566 Contents 1 Block diagram and application & test circuit . . . . . . . . . . . . . . . . . . . . . 5 1.1 Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 1.2 Application and test circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 2 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 3 Electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 4 5 3.1 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 3.2 Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 3.3 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 3.4 Electrical characteristics curves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Diagnostics functional description . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 4.1 Turn-on diagnostic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 4.2 Permanent diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 4.3 Output DC offset detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 4.4 AC diagnostic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 4.5 Multiple faults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 4.6 Faults availability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 4.7 I2C Programming/reading sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 I2C Bus interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 5.1 Data Validity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 5.2 Start and Stop Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 5.3 Byte Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 5.4 Acknowledge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 6 Software specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 7 Examples of bytes sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 8 Package informations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 9 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 2/28 TDA7566 List of tables List of tables Table 1. Table 2. Table 3. Table 4. Table 5. Table 6. Table 7. Table 8. Table 9. Table 10. Table 11. Table 12. Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Thermal data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Double Fault Table for Turn On Diagnostic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 Chip Address: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 IB1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 IB2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 DB1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 DB2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 DB3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 DB4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 3/28 List of figures TDA7566 List of figures Figure 1. Figure 2. Figure 3. Figure 4. Figure 5. Figure 6. Figure 7. Figure 8. Figure 9. Figure 10. Figure 11. Figure 12. Figure 13. Figure 14. Figure 15. Figure 16. Figure 17. Figure 18. Figure 19. Figure 20. Figure 21. Figure 22. Figure 23. Figure 24. Figure 25. Figure 26. Figure 27. Figure 28. 4/28 Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Application and test circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Pin connection (top view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Quiescent current vs. Supply voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Output power vs. supply voltage (4Ω). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Output power vs. supply voltage (2Ω). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Distortion vs. output power (4Ω) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Distortion vs. output power (2Ω) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Distortion vs. frequency (4Ω) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Distortion vs. frequency (2Ω) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Crosstalk vs. frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Supply voltage rejection vs. frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Power Dissipation & Efficiency vs. Output Power (4W, SINE) . . . . . . . . . . . . . . . . . . . . . . 11 Power Dissipation vs. Average Ouput Power (Audio Program Simulation, 4W). . . . . . . . . 11 Power Dissipation vs. Average Ouput Power (Audio Program Simulation, 2W). . . . . . . . . 11 Turn - On diagnostic: working principle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 SVR and Output behaviour (CASE 1: without turn-on diagnostic) . . . . . . . . . . . . . . . . . . . 13 SVR and Output pin behaviour (CASE 2: with turn-on diagnostic) . . . . . . . . . . . . . . . . . . . 13 Thresholds for SHORT TO GND/VS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Thresholds for SHORT ACROSS THE SPEAKER/OPEN SPEAKER . . . . . . . . . . . . . . . . 14 Thresholds for Line-Drivers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Restart timing without Diagnostic Enable (Permanent) . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Restart timing with Diagnostic Enable (Permanent) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Current detection: Load impedance magnitude |Z| Vs. output peak voltage of the sinus. . 16 Data Validity on the I2C BUS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 Timing diagram on the I2C Bus. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 Timing acknowledge clock pulse . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 Flexiwatt25 Mechanical Data & Package Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 TDA7566 Block diagram and application & test circuit 1 Block diagram and application & test circuit 1.1 Block diagram Figure 1. Block diagram CLK REFERENCE THERMAL PROTECTION & DUMP VCC1 DATA VCC2 I2C BUS CD_OUT CLIP DETECTOR MUTE1 MUTE2 F IN RF OUT RF+ 12/26dB OUT RFSHORT CIRCUIT PROTECTION & DIAGNOSTIC R IN RR OUT RR+ 12/26dB OUT RRSHORT CIRCUIT PROTECTION & DIAGNOSTIC F IN LF OUT LF+ 12/26dB OUT LFSHORT CIRCUIT PROTECTION & DIAGNOSTIC R IN LR OUT LR+ 12/26dB OUT LRSHORT CIRCUIT PROTECTION & DIAGNOSTIC SVR AC_GND RF RR LF LR D00AU1229 1.2 TAB S_GND PW_GND Application and test circuit Figure 2. Application and test circuit C8 0.1μF C7 3300μF Vcc1 Vcc2 6 DATA 20 17 I2C BUS 19 CLK 22 21 C1 0.22μF IN RF 23 C2 0.22μF 9 14 OUT RR + 8 7 C3 0.22μF IN LF OUT RF + 24 15 IN RR + 18 25 11 5 OUT LF + 2 C4 0.22μF IN LR 3 12 S-GND 13 16 10 4 1 OUT LR TAB 47K C5 1μF V C6 10μF D00AU1212 CD OUT 5/28 Pin description 2 TDA7566 Pin description Figure 3. Pin connection (top view) 25 DATA 24 PW_GND RR 23 OUT RR- 22 CK OUT RR+ 20 VCC2 19 OUT RF- 18 PW_GND RF 17 OUT RF+ 16 AC GND 15 IN RF 14 IN RR 13 S GND 12 IN LR 11 IN LF 10 SVR 9 OUT LF+ 8 PW_GND LF 7 OUT LF- 6 VCC1 OUT LR+ 4 CD-OUT 3 OUT LR- 2 PW_GND LR 1 TAB D99AU1037 6/28 TDA7566 Electrical specifications 3 Electrical specifications 3.1 Absolute maximum ratings Table 1. Absolute maximum ratings Symbol Value Unit Vop Operating Supply Voltage 18 V VS DC Supply Voltage 28 V Vpeak Peak Supply Voltage (for t = 50ms) 50 V VCK CK pin Voltage 6 V Data Pin Voltage 6 V IO Output Peak Current (not repetitive t = 100μs) 8 A IO Output Peak Current (repetitive f > 10Hz) 6 A Power Dissipation Tcase = 70°C 85 W -55 to 150 °C Value Unit 1 °C/W VDATA Ptot Tstg, Tj 3.2 Parameter Storage and Junction Temperature Thermal data Table 2. Thermal data Symbol Description Rth j-case Thermal Resistance Junction-case Max. 3.3 Electrical characteristics Table 3. Electrical characteristics (Refer to the test circuit, VS = 14.4V; RL = 4Ω; f = 1KHz; GV = 26dB; Tamb = 25°C; unless otherwise specified.) Symbol Parameter Test Condition Min. Typ. Max. Unit 18 V 300 mA POWER AMPLIFIER VS Supply Voltage Range Id Total Quiescent Drain Current PO Output Power 8 150 Max. (VS = 14.4V) 35 40 W THD = 10% THD = 1% 22 16 25 20 W W RL = 2Ω; EIAJ (VS = 13.7V) RL = 2Ω; THD 10% RL = 2Ω; THD 1% RL = 2Ω; MAX POWER 50 32 25 55 55 38 30 60 W W W W 7/28 Electrical specifications Table 3. Electrical characteristics (continued) (Refer to the test circuit, VS = 14.4V; RL = 4Ω; f = 1KHz; GV = 26dB; Tamb = 25°C; unless otherwise specified.) Symbol THD Parameter Total Harmonic Distortion CT Cross Talk RIN GV1 ΔGV1 TDA7566 Test Condition Typ. Max. Unit PO = 1W to 10W; 0.04 0.1 % GV = 12dB; VO = 0.1 to 5VRMS 0.02 0.05 % f = 1KHz to 10KHz, RG = 600W Min. 50 60 dB Input Impedance 60 100 130 KΩ Voltage Gain 1 25 26 27 dB Voltage Gain Match 1 -1 0 1 dB GV2 Voltage Gain 2 12 EIN1 Output Noise Voltage 1 Rg = 600Ω; 20Hz to 22kHz 35 EIN2 Output Noise Voltage 2 Rg = 600Ω; GV = 12dB; 20Hz to 22kHz 12 μV SVR Supply Voltage Rejection f = 100Hz to 10kHz; Vr = 1Vpk; Rg = 600Ω 60 dB BW Power Bandwidth 100 ASB Stand-by Attenuation 90 ISB Stand-by Current AM Mute Attenuation VOS Offset Voltage VAM Min. Supply Voltage Threshold TON Turn on Delay TOFF 50 dB 100 μV KHz 110 25 dB 100 μA 80 100 -100 0 100 mV 7 7.5 8 V D2/D1 (IB1) 0 to 1 20 50 ms Turn off Delay D2/D1 (IB1) 1 to 0 20 50 ms CDLK Clip Det High Leakage Current CD off 0 15 μA CDSAT Clip Det Sat. Voltage CD on; ICD = 1mA 300 mV CDTHD Clip Det THD level Mute & Play dB D0 (IB1) = 0 0 1 2 % D0 (IB1) = 1 5 10 15 % 1.2 V TURN ON DIAGNOSTICS 1 (Power Amplifier Mode) Pgnd Pvs Pnop 8/28 Short to GND det. (below this limit, the Output is considered in Short Circuit to GND) Short to Vs det. (above this limit, the Output isconsidered in Short Power Amplifier in st-by Circuit to VS) Normal operation thresholds.(Within these limits, the Output is considered without faults). Vs -1.2 1.8 V Vs -1.8 V TDA7566 Table 3. Symbol Electrical specifications Electrical characteristics (continued) (Refer to the test circuit, VS = 14.4V; RL = 4Ω; f = 1KHz; GV = 26dB; Tamb = 25°C; unless otherwise specified.) Parameter Lsc Shorted Load det. Lop Open Load det. Lnop Normal Load det. Test Condition Min. Typ. Max. Unit 0.5 W 85 W 1.65 45 W 1.2 V TURN ON DIAGNOSTICS 2 (Line Driver Mode) Pgnd Pvs Pnop Short to GND det. (below this limit, the Output is considered in Short Circuit to GND) Short to Vs det. (above this limit, the Output isconsidered in Short Power Amplifier in st-by Circuit to VS) Normal operation thresholds. (Within these limits, the Output is considered without faults). Lsc Shorted Load det. Lop Open Load det. Lnop Normal Load det. Vs -1.2 V 1.8 Vs -1.8 V 2 W 330 W 7 180 W 1.2 V PERMANENT DIAGNOSTICS 2 (Power Amplifier Mode or Line Driver Mode) Pgnd Short to GND det. (below this limit, the Output is considered in Short Circuit to GND) Power Amplifier in Mute or Play, one or more short circuits protection activated Pvs Short to Vs det. (above this limit, the Output is considered in Short Circuit to VS) Vs -1.2 Pnop Normal operation thresholds.(Within these limits, the Output is considered without faults). 1.8 V Power Amplifier mode LSC Shorter Load det. VO Offset Detection INL Normal load current detection IOL Open load current detection Line Driver mode Power Amplifier in play, AC Input signals = 0 1.5 2 Vs -1.8 V 0.5 W 2 W 2.5 V 500 mA VO < (VS - 5)pk 250 mA I2C BUS INTERFACE fSCL Clock Frequency VIL Input Low Voltage VIH Input High Voltage 400 KHz 1.5 2.3 V V 9/28 Electrical specifications TDA7566 3.4 Electrical characteristics curves Figure 4. Quiescent current vs. Supply voltage 250 Figure 5. Output power vs. supply voltage (4Ω) Po (W) Id (mA) 70 65 230 60 Vin = 0 NO LOADS 210 55 50 190 Po-max RL = 4 Ohm f = 1 KHz 45 170 THD= 10 % 40 150 35 130 30 110 25 20 90 THD= 1 % 15 70 10 5 50 8 10 Figure 6. 12 Vs (V) 14 16 18 Output power vs. supply voltage (2Ω) Po (W) 80 75 70 65 60 55 50 45 40 35 30 25 20 15 10 5 8 9 10 Figure 7. 10 11 12 13 Vs (V) 14 15 16 17 18 Distortion vs. output power (4Ω) THD (%) Po-max Vs = 14.4 V RL = 4 Ohm RL = 2 Ohm f = 1 KHz 1 THD= 10 % f = 10 KHz 0.1 THD= 1 % 8 9 Figure 8. 10 11 12 Vs (V) 13 14 15 f = 1 KHz 16 0.01 0.1 1 10 Po (W) Distortion vs. output power (2Ω) Figure 9. THD (%) Distortion vs. frequency (4Ω) THD (%) 10 10 Vs = 14.4 V RL = 2 Ohm 1 1 Vs = 14.4 V RL = 4 Ohm Po = 4 W f = 10 KHz 0.1 0.01 0.1 f = 1 KHz 1 10 Po (W) 10/28 0.1 0.01 10 100 f (Hz) 1000 10000 TDA7566 Electrical specifications Figure 10. Distortion vs. frequency (2Ω) Figure 11. Crosstalk vs. frequency THD (%) CROSSTALK (dB) 10 90 80 Vs = 14.4 V RL = 2 Ohm Po = 8 W 1 70 60 Vs = 14.4 V RL = 4 Ohm Po = 4 W Rg = 600 Ohm 50 0.1 40 30 0.01 10 100 1000 20 10 10000 f (Hz) Figure 12. Supply voltage rejection vs. frequency 100 f (Hz) 1000 10000 Figure 13. Power Dissipation & Efficiency vs. Output Power (4Ω, SINE) SVR (dB) n (%) Ptot (W) 90 90 80 80 90 70 70 80 n Vs = 14.4 V RL = 4x4 Ohm f= 1 KHz SINE 70 60 60 60 50 50 40 Rg = 600 Ohm Vripple = 1 Vpk 40 30 50 Ptot 30 30 20 20 10 10 0 20 10 100 f (Hz) 1000 40 0 10000 2 4 6 8 10 12 14 Po (W) 16 18 20 22 24 0 26 Figure 14. Power Dissipation vs. Average Ouput Figure 15. Power Dissipation vs. Average Ouput Power (Audio Program Simulation, 4Ω) Power (Audio Program Simulation, 2Ω) Ptot (W) Ptot (W) 45 90 80 40 Vs = 14.4 V RL = 4x4 Ohm GAUSSIAN NOISE 35 Vs = 14.4 V RL = 4x2 Ohm GAUSSIAN NOISE 70 CLIP START 30 60 CLIP START 50 25 40 20 30 15 20 10 10 0 5 0 1 2 3 Po (W) 4 5 0 1 2 3 4 Po (W) 5 6 7 8 11/28 Diagnostics functional description TDA7566 4 Diagnostics functional description 4.1 Turn-on diagnostic It is activated at the turn-on (stand-by out) under I2C bus request. Detectable output faults are: – Short to gnd – Short to VS – Short across the speaker – Open speaker To verify if any of the above misconnections are in place, a subsonic (inaudible) current pulse (Figure 16) is internally generated, sent through the speaker(s) and sunk back.The Turn On diagnostic status is internally stored until a successive diagnostic pulse is requested (after a I2C reading). If the "stand-by out" and "diag. enable" commands are both given through a single programming step, the pulse takes place first (power stage still in stand-by mode, low, outputs = high impedance). Afterwards, when the Amplifier is biased, the PERMANENT diagnostic takes place. The previous Turn On state is kept until a short appears at the outputs. Figure 16. Turn - On diagnostic: working principle Vs~5V Isource I (mA) Isource CH+ Isink CHIsink ~100ms t (ms) Measure time Figure 17 and 18 show SVR and OUTPUT waveforms at the turn-on (stand-by out) with and without TURN-ON DIAGNOSTIC. 12/28 TDA7566 Diagnostics functional description Figure 17. SVR and Output behaviour (CASE 1: without turn-on diagnostic) Vsvr Out Permanent diagnostic acquisition time (100mS Typ) t Diagnostic Enable (Permanent) Bias (power amp turn-on) FAULT event Read Data Permanent Diagnostics data (output) permitted time I2CB DATA Figure 18. SVR and Output pin behaviour (CASE 2: with turn-on diagnostic) Vsvr Out Turn-on diagnostic acquisition time (100mS Typ) Diagnostic Enable (Turn-on) Permanent diagnostic acquisition time (100mS Typ) Turn-on Diagnostics data (output) permitted time Bias (power amp turn-on) permitted time Diagnostic Enable (Permanent) Read Data FAULT event t Permanent Diagnostics data (output) permitted time I2CB DATA The information related to the outputs status is read and memorized at the end of the current pulse top. The acquisition time is 100 ms (typ.). No audible noise is generated in the process. As for SHORT TO GND / Vs the fault-detection thresholds remain unchanged from 26 dB to 12 dB gain setting. They are as follows: Figure 19. Thresholds for SHORT TO GND/VS S.C. to GND 0V 1.2V x Normal Operation 1.8V VS-1.8V x S.C. to Vs VS-1.2V D01AU1253 VS 13/28 Diagnostics functional description TDA7566 Concerning SHORT ACROSS THE SPEAKER / OPEN SPEAKER, the threshold varies from 26 dB to 12 dB gain setting, since different loads are expected (either normal speaker's impedance or high impedance). The values in case of 26 dB gain are as follows: Figure 20. Thresholds for SHORT ACROSS THE SPEAKER/OPEN SPEAKER S.C. across Load 0V x 0.5Ω Normal Operation 1.75Ω x Open Load 85Ω 45Ω Infinite D01AU1327 If the Line-Driver mode (Gv= 12 dB and Line Driver Mode diagnostic = 1) is selected, the same thresholds will change as follows: Figure 21. Thresholds for Line-Drivers S.C. across Load 0Ω x 2Ω Normal Operation 7Ω 180Ω x Open Load 330Ω infinite D02AU1340 4.2 Permanent diagnostics Detectable conventional faults are: – SHORT TO GND – SHORT TO Vs – SHORT ACROSS THE SPEAKER The following additional features are provided: – OUTPUT OFFSET DETECTION – AC DIAGNOSTIC The TDA7566 has 2 operating statuses: 14/28 1. RESTART mode. The diagnostic is not enabled. Each audio channel operates independently from each other. If any of the a.m. faults occurs, only the channel(s) interested is shut down. A check of the output status is made every 1 ms (Figure 22). Restart takes place when the overload is removed. 2. DIAGNOSTIC mode. It is enabled via I2C bus and self activates if an output overload (such to cause the intervention of the short-circuit protection) occurs to the speakers outputs . Once activated, the diagnostics procedure develops as follows (Figure 23): – To avoid momentary re-circulation spikes from giving erroneous diagnostics, a check of the output status is made after 1ms: if normal situation (no overloads) is detected, the diagnostic is not performed and the channel returns back active. – Instead, if an overload is detected during the check after 1 ms, then a diagnostic cycle having a duration of about 100 ms is started. – After a diagnostic cycle, the audio channel interested by the fault is switched to RESTART mode. The relevant data are stored inside the device and can be read by the microprocessor. When one cycle has terminated, the next one is activated TDA7566 Diagnostics functional description by an I2C reading. This is to ensure continuous diagnostics throughout the carradio operating time. – To check the status of the device a sampling system is needed. The timing is chosen at microprocessor level (over half a second is recommended). Figure 22. Restart timing without Diagnostic Enable (Permanent) Each 1ms time, a sampling of the fault is done Out 1-2mS 1mS 1mS 1mS 1mS t Overcurrent and short circuit protection intervention (i.e. short circuit to GND) Short circuit removed Figure 23. Restart timing with Diagnostic Enable (Permanent) 1mS 100mS 1mS 1mS t Overcurrent and short Short circuit removed (i.e. short circuit to GND) 4.3 Output DC offset detection Any DC output offset exceeding ±2V are signalled out. This inconvenient might occur as a consequence of initially defective or aged and worn-out input capacitors feeding a DC component to the inputs, so putting the speakers at risk of overheating. This diagnostic has to be performed with low-level output AC signal (or Vin = 0). The test is run with selectable time duration by microprocessor (from a "start" to a "stop" command): START = Last reading operation or setting IB1 - D5 - (OFFSET enable) to 1 STOP = Actual reading operation Excess offset is signalled out if persistent throughout the assigned testing time. This feature is disabled if any overloads leading to activation of the short-circuit protection occurs in the process. 4.4 AC diagnostic It is targeted at detecting accidental disconnection of tweeters in 2-way speaker and, more in general, presence of capacitively (AC) coupled loads. This diagnostic is based on the notion that the overall speaker's impedance (woofer + parallel tweeter) will tend to increase towards high frequencies if the tweeter gets 15/28 Diagnostics functional description TDA7566 disconnected, because the remaining speaker (woofer) would be out of its operating range (high impedance). The diagnostic decision is made according to peak output current thresholds, as follows: Iout > 500mApk = NORMAL STATUS Iout < 250mApk = OPEN TWEETER To correctly implement this feature, it is necessary to briefly provide a signal tone (with the amplifier in "play") whose frequency and magnitude are such to determine an output current higher than 500mApk in normal conditions and lower than 250mApk should the parallel tweeter be missing. The test has to last for a minimum number of 3 sine cycles starting from the activation of the AC diagnostic function IB2<D2>) up to the I2C reading of the results (measuring period). To confirm presence of tweeter, it is necessary to find at least 3 current pulses over 500mA over all the measuring period, else an "open tweeter" message will be issued. The frequency / magnitude setting of the test tone depends on the impedance characteristics of each specific speaker being used, with or without the tweeter connected (to be calculated case by case). High-frequency tones (> 10 KHz) or even ultrasonic signals are recommended for their negligible acoustic impact and also to maximize the impedance module's ratio between with tweeter-on and tweeter-off. Figure 24 shows the Load Impedance as a function of the peak output voltage and the relevant diagnostic fields. This feature is disabled if any overloads leading to activation of the short-circuit protection occurs in the process. Figure 24. Current detection: Load impedance magnitude |Z| Vs. output peak voltage of the sinus Load |z| (Ohm) 50 Iout (peak) <250mA 30 20 Low current detection area (Open load) D5 = 1 of the DBx byres Iout (peak) >500mA 10 High current detection area (Normal load) D5 = 0 of the DBx bytes 5 3 2 1 1 2 3 4 5 6 7 8 Vout (Peak) 4.5 Multiple faults When more misconnections are simultaneously in place at the audio outputs, it is guaranteed that at least one of them is initially read out. The others are notified after successive cycles of I2C reading and faults removal, provided that the diagnostic is enabled. This is true for both kinds of diagnostic (Turn on and Permanent). 16/28 TDA7566 Diagnostics functional description The table below shows all the couples of double-fault possible. It should be taken into account that a short circuit with the 4 ohm speaker unconnected is considered as double fault. Table 4. Double Fault Table for Turn On Diagnostic S. GND (so) S. GND (sk) S. Vs S. Across L. Open L. S. GND (so) S. GND S. GND S. Vs + S. GND S. GND S. GND S. GND (sk) / S. GND S. Vs S. GND Open L. (*) S. Vs / / S. Vs S. Vs S. Vs S. Across L. / / / S. Across L. N.A. Open L. / / / / Open L. (*) S. GND (so) / S. GND (sk) in the above table make a distinction according to which of the 2 outputs is shorted to ground (test-current source side= so, test-current sink side = sk). More precisely, in channels LF and LR, so = CH+, sk = CH-; in channels LR and RF, so = CH-, SK = CH+. In Permanent Diagnostic the table is the same, with only a difference concerning Open Load (*), which is not among the recognisable faults. Should an Open Load be present during the device's normal working, it would be detected at a subsequent Turn on Diagnostic cycle (i.e. at the successive Car Radio Turn on). 4.6 Faults availability All the results coming from I2Cbus, by read operations, are the consequence of measurements inside a defined period of time. If the fault is stable throughout the whole period, it will be sent out. This is true for DC diagnostic (Turn on and Permanent), for Offset Detector, for AC Diagnostic (the low current sensor needs to be stable to confirm the Open tweeter). To guarantee always resident functions, every kind of diagnostic cycles (Turn on, Permanent, Offset, AC) will be reactivate after any I2C reading operation. So, when the micro reads the I2C, a new cycle will be able to start, but the read data will come from the previous diag. cycle (i.e. The device is in Turn On state, with a short to Gnd, then the short is removed and micro reads I2C. The short to Gnd is still present in bytes, because it is the result of the previous cycle. If another I2C reading operation occurs, the bytes do not show the short). In general to observe a change in Diagnostic bytes, two I2C reading operations are necessary. 4.7 I2C Programming/reading sequence A correct turn on/off sequence respectful of the diagnostic timings and producing no audible noises could be as follows (after battery connection): TURN-ON: (STAND-BY OUT + DIAG ENABLE) --- 500 ms (min) --- MUTING OUT TURN-OFF: MUTING IN --- 20 ms --- (DIAG DISABLE + STAND-BY IN) 17/28 Diagnostics functional description TDA7566 Car Radio Installation: DIAG ENABLE (write) --- 200 ms --- I2C read (repeat until All faults disappear). AC TEST: FEED H.F. TONE -- AC DIAG ENABLE (write) --- WAIT > 3 CYCLES --- I2C read (repeat I2C reading until tweeter-off message disappears). OFFSET TEST: Device in Play (no signal) -- OFFSET ENABLE - 30ms - I2C reading (repeat I2C reading until high-offset message disappears). 18/28 TDA7566 5 I2C Bus interface I2C Bus interface Data transmission from microprocessor to the TDA7566 and viceversa takes place through the 2 wires I2C BUS interface, consisting of the two lines SDA and SCL (pull-up resistors to positive supply voltage must be connected). 5.1 Data Validity As shown by Figure 25, the data on the SDA line must be stable during the high period of the clock. The HIGH and LOW state of the data line can only change when the clock signal on the SCL line is LOW. 5.2 Start and Stop Conditions As shown by Figure 26 a 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. 5.3 Byte Format Every byte transferred to the SDA line must contain 8 bits. Each byte must be followed by an acknowledge bit. The MSB is transferred first. 5.4 Acknowledge The transmitter* puts a resistive HIGH level on the SDA line during the acknowledge clock pulse (see Figure 27). The receiver** the acknowledges has to pull-down (LOW) the SDA line during the acknowledge clock pulse, so that the SDAline is stable LOW during this clock pulse. * Transmitter – master (µP) when it writes an address to the TDA7566 – slave (TDA7566) when the µP reads a data byte from TDA7566 ** Receiver – slave (TDA7566) when the µP writes an address to the TDA7566 – master (µP) when it reads a data byte from TDA7566 Figure 25. Data Validity on the I2C BUS SDA SCL DATA LINE STABLE, DATA VALID CHANGE DATA ALLOWED D99AU1031 19/28 I2C Bus interface TDA7566 Figure 26. Timing diagram on the I2C Bus SCL I2CBUS SDA D99AU1032 START STOP Figure 27. Timing acknowledge clock pulse SCL 1 2 3 7 8 9 SDA MSB START 20/28 D99AU1033 ACKNOWLEDGMENT FROM RECEIVER TDA7566 6 Software specifications Software specifications All the functions of the TDA7566 are activated by I2C interface. The bit 0 of the "ADDRESS BYTE" defines if the next bytes are write instruction (from μP to TDA7566) or read instruction (from TDA7566 to µP). Table 5. Chip Address: D7 1 D0 1 0 1 1 0 0 X D8 Hex X = 0 Write to device X = 1 Read from device If R/W = 0, the μP sends 2 "Instruction Bytes": IB1 and IB2. Table 6. IB1 D7 0 D6 Diagnostic enable (D6 = 1) Diagnostic defeat (D6 = 0) D5 Offset Detection enable (D5 = 1) Offset Detection defeat (D5 = 0) D4 Front Channel Gain = 26dB (D4 = 0) Gain = 12dB (D4 = 1) D3 Rear Channel Gain = 26dB (D3 = 0) Gain = 12dB (D3 = 1) D2 Mute front channels (D2 = 0) Unmute front channels (D2 = 1) D1 Mute rear channels (D1 = 0) Unmute rear channels (D1 = 1) D0 CD 2% (D0 = 0) CD 10% (D0 = 1) Table 7. IB2 D7 0 D6 0 D5 0 D4 Stand-by on - Amplifier not working - (D4 = 0) Stand-by off - Amplifier working - (D4 = 1) D3 Power amplifier mode diagnostic (D3 = 0) Line driver mode diagnostic (D3 = 1) 21/28 Software specifications Table 7. TDA7566 IB2 (continued) D2 Current detection diagnostic enabled (D2 = 1) Current detection diagnostic defeat (D2 = 0) D1 0 D0 0 If R/W = 1, the TDA7566 sends 4 "Diagnostics Bytes" to mP: DB1, DB2, DB3 and DB4. Table 8. D7 Thermal warning active (D7 = 1) D6 Diag. cycle not activated or not terminated (D6 = 0) Diag. cycle terminated (D6 = 1) D5 Channel LF current detection Output peak current < 250mA - Open load (D5 = 1) Output peak current > 500mA - Open load (D5 = 0) D4 Channel LF Turn-on diagnostic (D4 = 0) Permanent diagnostic (D4 = 1) D3 Channel LF Normal load (D3 = 0) Short load (D3 = 1) D2 Channel LF Turn-on diag.: No open load (D2 = 0) Open load detection (D2 = 1) Offset diag.: No output offset (D2 = 0) Output offset detection (D2 = 1) D1 Channel LF No short to Vcc (D1 = 0) Short to Vcc (D1 = 1) D0 Channel LF No short to GND (D1 = 0) Short to GND (D1 = 1) Table 9. 22/28 DB1 DB2 D7 Offset detection not activated (D7 = 0) Offset detection activated (D7 = 1) D6 Current sensor not activated (D6 = 0) Current sensor activated (D6 = 1) D5 Channel LR current detection Output peak current < 250mA - Open load (D5 = 1) Output peak current > 500mA - Open load (D5 = 0) TDA7566 Software specifications Table 9. DB2 (continued) D4 Channel LR Turn-on diagnostic (D4 = 0) Permanent diagnostic (D4 = 1) D3 Channel LR Normal load (D3 = 0) Short load (D3 = 1) D2 Channel LR Turn-on diag.: No open load (D2 = 0) Open load detection (D2 = 1) Permanent diag.: No output offset (D2 = 0) Output offset detection (D2 = 1) D1 Channel LR No short to Vcc (D1 = 0) Short to Vcc (D1 = 1) D0 Channel LR No short to GND (D1 = 0) Short to GND (D1 = 1) Table 10. DB3 D7 Stand-by status (= IB1 - D4) D6 Diagnostic status (= IB1 - D6) D5 Channel RF current detection Output peak current < 250mA - Open load (D5 = 1) Output peak current > 500mA - Open load (D5 = 0) D4 Channel RF Turn-on diagnostic (D4 = 0) Permanent diagnostic (D4 = 1) D3 Channel RF Normal load (D3 = 0) Short load (D3 = 1) D2 Channel RF Turn-on diag.: No open load (D2 = 0) Open load detection (D2 = 1) Permanent diag.: No output offset (D2 = 0) Output offset detection (D2 = 1) D1 Channel RF No short to Vcc (D1 = 0) Short to Vcc (D1 = 1) D0 Channel RF No short to GND (D1 = 0) Short to GND (D1 = 1) 23/28 Software specifications Table 11. 24/28 TDA7566 DB4 D7 X D6 X D5 Channel R Rcurrent detection Output peak current < 250mA - Open load (D5 = 1) Output peak current > 500mA - Open load (D5 = 0) D4 Channel RR Turn-on diagnostic (D4 = 0) Permanent diagnostic (D4 = 1) D3 Channel RR Normal load (D3 = 0) Short load (D3 = 1) D2 Channel RR Turn-on diag.: No open load (D2 = 0) Open load detection (D2 = 1) Permanent diag.: No output offset (D2 = 0) Output offset detection (D2 = 1) D1 Channel RR No short to Vcc (D1 = 0) Short to Vcc (D1 = 1) D0 Channel RR No short to GND (D1 = 0) Short to GND (D1 = 1) 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 X000000X IB2 ACK STOP ACK STOP ACK STOP XXX1X0XX 3b - Turn-Off of the power amplifier Start Address byte with D0 = 0 ACK IB1 ACK X0XXXXXX IB2 XXX0XXXX 4 - Offset detection procedure enable Start Address byte with D0 = 0 ACK IB1 ACK XX1XX11X IB2 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 XX01111X IB2 ACK STOP 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. 25/28 Package informations 8 TDA7566 Package informations In order to meet environmental requirements, ST offers this device in ECOPACK® packages. This package have a Lead-free second level interconnect. The category of second level interconnect is marked on the package and on the inner box label, in compliance with JEDEC Standard JESD97. The maximum ratings related to soldering conditions are also marked on the inner box label. ECOPACK is an ST trademark. ECOPACK specifications are available at: www.st.com. Figure 28. Flexiwatt25 Mechanical Data & Package Dimensions DIM. A B C D E F (1) G G1 H (2) H1 H2 H3 L (2) L1 L2 (2) L3 L4 L5 M M1 N O R R1 R2 R3 R4 V V1 V2 V3 MIN. 4.45 1.80 0.75 0.37 0.80 23.75 28.90 22.07 18.57 15.50 7.70 3.70 3.60 mm TYP. 4.50 1.90 1.40 0.90 0.39 1.00 24.00 29.23 17.00 12.80 0.80 22.47 18.97 15.70 7.85 5 3.5 4.00 4.00 2.20 2 1.70 0.5 0.3 1.25 0.50 MAX. 4.65 2.00 MIN. 0.175 0.070 1.05 0.42 0.57 1.20 24.25 29.30 0.029 0.014 0.031 0.935 1.139 22.87 19.37 15.90 7.95 0.869 0.731 0.610 0.303 4.30 4.40 0.145 0.142 inch TYP. 0.177 0.074 0.055 0.035 0.015 0.040 0.945 1.150 0.669 0.503 0.031 0.884 0.747 0.618 0.309 0.197 0.138 0.157 0.157 0.086 0.079 0.067 0.02 0.12 0.049 0.019 MAX. 0.183 0.079 OUTLINE AND MECHANICAL DATA 0.041 0.016 0.022 0.047 0.955 1.153 0.904 0.762 0.626 0.313 0.169 0.173 Flexiwatt25 (vertical) 5˚ (T p.) 3˚ (Typ.) 20˚ (Typ.) 45˚ (Typ.) (1): dam-bar protusion not included (2): molding protusion included V C B V H H1 V3 A H2 O H3 R3 L4 R4 V1 R2 L2 N L3 R L L1 V1 V2 R2 D R1 L5 Pin 1 R1 R1 E G G1 F FLEX25ME M M1 7034862 26/28 TDA7566 9 Revision history Revision history Table 12. Document revision history Date Revision Changes 20-Sep-2003 1 Initial release. 12-Jul-2006 2 Changed the layout graphic in the new corporate one. Corrected the values of INL and IOL parameters in the Table 3 on page 9/28. 18-Dec-2006 3 Updated Figure 20 and 21. 27/28 TDA7566 Please Read Carefully: Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries (“ST”) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any time, without notice. All ST products are sold pursuant to ST’s terms and conditions of sale. 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