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october 2010 doc id 9801 rev 5 1/29 1 tda7566 4 x 40 w multifunction quad power amplifier with built-in diagnostics features features dmos power output high output power capability 4 x 25 w/4 @ 14.4 v, 1 khz, 10 % thd, 4 x 40 w max. power max. output power 4 x 60 w/2 full i 2 c bus driving: ? standby ? independent front/rear soft play/mute ? selectable gain 26 db - 12 db ?i 2 c bus digital diagnostics full fault protection dc offset detection four independent short circuit protection clipping detector pin with selectable threshold (1%, 10%) esd protection description the tda7566 is a new bcd technology quad bridge type of car radio amplifier in flexiwatt25 package specially intended for car radio applications. thanks to the dmos output stage the tda7566 has a very low distortion allowing a clear powerful sound. this device is equipped with a full diagnostics array that communicates the status of each speaker through the i 2 c bus. the possibility to contro l the configuration and behavior of the device by means of the i 2 c bus makes tda7566 a very flexible product. flexiwatt25 table 1. device summary order code package packing e-tda7566 flexiwatt25 tube tda7566 (1) 1. obsolete product. flexiwatt25 tube www.st.com
contents tda7566 2/29 doc id 9801rev 5 contents 1 block diagram and application and test circuit . . . . . . . . . . . . . . . . . . . 5 1.1 block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 1.2 application and test circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 2 pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 3 electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 3.1 absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 3.2 thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 3.3 electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 3.4 electrical characteristics curves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 4 diagnostics functional desc ription . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 4.1 turn-on diagnostic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 4.2 permanent diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 4.3 output dc offset detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 4.4 ac diagnostic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 4.5 multiple faults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 4.6 faults availability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 4.7 i2c programming/reading sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 5 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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 8 package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 9 revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
tda7566 list of tables doc id 9801rev 5 3/29 list of tables table 1. device summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 table 2. absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 table 3. thermal data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 table 4. electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 table 5. double fault table for turn-on diagnostic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 table 6. ib1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 table 7. ib2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 table 8. db1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 table 9. db2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 table 10. db3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 table 11. db4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 table 12. document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
list of figures tda7566 4/29 doc id 9801rev 5 list of figures figure 1. block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 figure 2. application and test circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 figure 3. pin connection (top view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 figure 4. quiescent current vs. supply voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 figure 5. output power vs. supply voltage (4 ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 figure 6. output power vs. supply voltage (2 ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 figure 7. distortion vs. output power (4 ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 figure 8. distortion vs. output power (2 ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 figure 9. distortion vs. frequency (4 ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 figure 10. distortion vs. frequency (2 ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 figure 11. crosstalk vs. frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 figure 12. supply voltage rejection vs. frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 figure 13. power dissipation and efficiency vs. output power (4 w, sine) . . . . . . . . . . . . . . . . . . . . . 11 figure 14. power dissipation vs. average output power (audio program simulation, 4 w) . . . . . . . . . 11 figure 15. power dissipation vs. average output power (audio program simulation, 2 w) . . . . . . . . . 11 figure 16. turn - on diagnostic: working principle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 figure 17. svr and output behavior (case 1: without turn-on diagnostic). . . . . . . . . . . . . . . . . . . . . . 13 figure 18. svr and output pin behavior (case 2: with turn-on diagnostic) . . . . . . . . . . . . . . . . . . . . . 13 figure 19. thresholds for short to gnd/v s . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 figure 20. thresholds for short across the speaker/open speaker . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 figure 21. thresholds for line-drivers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 figure 22. restart timing without diagnostic enable (permanent) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 figure 23. restart timing with diagnostic enable (permanent) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 figure 24. current detection: load impedance magnitude |z| vs. output peak voltage of the sinus. . . 16 figure 25. data validity on the i 2 c bus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 figure 26. timing diagram on the i 2 c bus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 figure 27. timing acknowledge clock pulse . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 figure 28. flexiwatt25 mechanical data and package dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
tda7566 block diagram and application and test circuit doc id 9801rev 5 5/29 1 block diagram and application and test circuit 1.1 block diagram figure 1. block diagram 1.2 application and test circuit figure 2. application and test circuit i2c bus thermal protection & dump reference clip detector f r f svr rf rr lf lr tab s_gnd ac_gnd r in rf in rr in lf in lr out lr- pw_gnd out lr+ out lf- out lf+ out rr- out rr+ out rf- out rf+ mute1 mute2 short circuit protection & diagnostic 12/26db 12/26db 12/26db 12/26db short circuit protection & diagnostic short circuit protection & diagnostic short circuit protection & diagnostic v cc1 v cc2 data cd_out clk d00au1229 in rf c1 0.22 f in rr c2 0.22 f out rf out rr in lf c3 0.22 f in lr c4 0.22 f out lf out lr d00au1212 c5 1 f c6 10 f tab 47k - + - + - + - + vcc1 vcc2 c8 0.1 f c7 3300 f data i 2 c bus clk 12 11 14 15 22 25 13 s-gnd 16 10 4 cd out v 620 17 18 19 21 24 23 9 8 7 5 2 3 1
pin description tda7566 6/29 doc id 9801rev 5 2 pin description figure 3. pin connection (top view) d99au1037 tab pw_gnd lr out lr- cd-out out lr+ v cc1 out lf- pw_gnd lf out lf+ svr in lf in lr s gnd in rr in rf ac gnd out rf+ pw_gnd rf out rf- v cc2 out rr+ ck out rr- pw_gnd rr data 1 25 2 3 4 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 22 23 24
tda7566 electrical specifications doc id 9801rev 5 7/29 3 electrical specifications 3.1 absolute maximum ratings 3.2 thermal data 3.3 electrical characteristics table 2. absolute maximum ratings symbol parameter value unit v op operating supply voltage 18 v v s dc supply voltage 28 v v peak peak supply voltage (for t = 50 ms) 50 v v ck ck pin voltage 6 v v data data pin voltage 6 v i o output peak current (not repetitive t = 100 s) 8 a i o output peak current (repetitive f > 10 hz) 6 a p tot power dissipation t case = 70 c 85 w t stg , t j storage and junction temperature -55 to 150 c table 3. thermal data symbol description value unit r th j-case thermal resistance junction-to-case max. 1 c/w table 4. electrical characteristics (refer to the test circuit, v s = 14.4 v; r l = 4 ; f = 1 khz; g v = 26 db; t amb = 25 c; unless otherwise specified.) symbol parameter test condition min. typ. max. unit power amplifier v s supply voltage range - 8 - 18 v i d total quiescent drain current - - 150 300 ma p o output power max. (v s = 14.4 v) 35 40 - w thd = 10 % thd = 1 % 22 16 25 20 - w w r l = 2 ; eiaj (v s = 13.7 v) r l = 2 ; thd 10 % r l = 2 ; thd 1 % r l = 2 ; max power 50 32 25 55 55 38 30 60 - w w w w
electrical specifications tda7566 8/29 doc id 9801rev 5 thd total harmonic distortion p o = 1 w to 10 w - 0.04 0.1 % g v = 12 db; v o = 0.1 to 5 v rms - 0.02 0.05 % c t cross talk f = 1 khz to 10 khz, r g = 600 w 50 60 - db r in input impedance - 60 100 130 k g v1 voltage gain 1 - 25 26 27 db g v1 voltage gain match 1 - -1 0 1 db g v2 voltage gain 2 - - 12 - db e in1 output noise voltage 1 r g = 600 ; 20 hz to 22 khz - 35 100 v e in2 output noise voltage 2 r g = 600 ; g v = 12 db; 20 hz to 22 khz -12- v svr supply voltage rejection f = 100 hz to 10 khz; v r = 1v pk; r g = 600 50 60 - db bw power bandwidth - 100 - - khz a sb standby attenuation - 90 110 - db i sb standby current - - 25 100 a a m mute attenuation - 80 100 - db v os offset voltage mute and play -100 0 100 mv v am min. supply voltage threshold - 7 7.5 8 v t on turn on delay d2/d1 (ib1) 0 to 1 - 20 50 ms t off turn off delay d2/d1 (ib1) 1 to 0 - 20 50 ms cd lk clip det high leakage current cd off - 0 15 a cd sat clip det sat. voltage cd on; i cd = 1ma - - 300 mv cd thd clip det thd level d0 (ib1) = 0 0 1 2 % d0 (ib1) = 1 5 10 15 % turn on diagnostics 1 (power amplifier mode) pgnd short to gnd det. (below this limit, the output is considered in short circuit to gnd) power amplifier in standby --1.2v pvs short to vs det. (above this limit, the output is considered in short circuit to vs) vs -1.2 - - v pnop normal operation thresholds.(within these limits, the output is considered without faults). 1.8 - vs -1.8 v table 4. electrical characteristics (continued) (refer to the test circuit, v s = 14.4 v; r l = 4 ; f = 1 khz; g v = 26 db; t amb = 25 c; unless otherwise specified.) symbol parameter test condition min. typ. max. unit
tda7566 electrical specifications doc id 9801rev 5 9/29 lsc shorted load det. - - - 0.5 lop open load det. - 85 - - lnop normal load det. - 1.65 - 45 turn on diagnostics 2 (line driver mode) pgnd short to gnd det. (below this limit, the output is considered in short circuit to gnd) power amplifier in standby --1.2v pvs short to vs det. (above this limit, the output is considered in short circuit to vs) vs -1.2 - - v pnop normal operation thresholds. (within these limits, the output is considered without faults). 1.8 - vs -1.8 v lsc shorted load det. - - - 2 lop open load det. - 330 - - lnop normal load det. - 7 - 180 permanent diagnostics 2 (power amp lifier 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 --1.2v pvs short to vs det. (above this limit, the output is considered in short circuit to vs) - vs -1.2 - - v pnop normal operation thresholds.(within these limits, the output is considered without faults). - 1.8 - vs -1.8 v l sc shorter load det. power amplifier mode - - 0.5 line driver mode - - 2 v o offset detection power amplifier in play, ac input signals = 0 1.522.5v i nl normal load current detection v o < (v s - 5)pk 500 - - ma i ol open load current detection - - 250 ma i 2 c bus interface f scl clock frequency - - 400 - khz v il input low voltage - - - 1.5 v v ih input high voltage - 2.3 - - v table 4. electrical characteristics (continued) (refer to the test circuit, v s = 14.4 v; r l = 4 ; f = 1 khz; g v = 26 db; t amb = 25 c; unless otherwise specified.) symbol parameter test condition min. typ. max. unit
electrical specifications tda7566 10/29 doc id 9801rev 5 3.4 electrical characteristics curves figure 4. quiescent current vs. supply voltage figure 5. output power vs. supply voltage (4 ) figure 6. output power vs. supply voltage (2 ) figure 7. distortion vs. output power (4 ) figure 8. distortion vs. output power (2 ) figure 9. distortion vs. frequency (4 ) 8 1012141618 vs ( v ) 50 70 90 110 130 150 170 190 210 230 250 id (ma) vin = 0 no loads 8 9 10 11 12 13 14 15 16 17 18 vs ( v ) 5 10 15 20 25 30 35 40 45 50 55 60 65 70 po (w) rl = 4 ohm f = 1 khz thd= 10 % po-max thd= 1 % 8 9 10 11 12 13 14 15 16 vs ( v ) 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 po (w) rl = 2 ohm f = 1 khz thd= 10 % po-max thd= 1 % 0.1 1 10 po ( w ) 0.01 0.1 1 10 thd (%) f = 10 khz vs = 14.4 v rl = 4 ohm f = 1 khz 0.1 1 10 po ( w ) 0.01 0.1 1 10 thd (%) f = 10 khz vs = 14.4 v rl = 2 ohm f = 1 khz 0.01 10 100 1000 10000 f ( hz ) 0.1 1 10 thd (%) vs = 14.4 v rl = 4 ohm po = 4 w
tda7566 electrical specifications doc id 9801rev 5 11/29 figure 10. distortion vs. frequency (2 ) figure 11. crosstalk vs. frequency figure 12. supply voltage rejection vs. frequency figure 13. power dissipation and efficiency vs. output power (4 , sine) figure 14. power dissipation vs. average output power (audio program simulation, 4 ) figure 15. power dissipation vs. average output power (audio program simulation, 2 ) 10 100 1000 10000 f ( hz ) 0.01 0.1 1 10 thd (%) vs = 14.4 v rl = 2 ohm po = 8 w 10 100 1000 10000 f ( hz ) 20 30 40 50 60 70 80 90 crosstalk (db) vs = 14.4 v rl = 4 ohm po = 4 w rg = 600 ohm 10 100 1000 10000 f ( hz ) 20 30 40 50 60 70 80 90 svr (db) rg = 600 ohm vripple = 1 vpk 0 2 4 6 8 101214161820222426 po ( w ) 0 10 20 30 40 50 60 70 80 90 ptot (w) 0 10 20 30 40 50 60 70 80 90 n (%) n ptot vs = 14.4 v rl = 4x4 ohm f= 1 khz sine 012345 po ( w ) 5 10 15 20 25 30 35 40 45 ptot (w) clip start vs = 14.4 v rl = 4x4 ohm gaussian noise 012345678 po ( w ) 0 10 20 30 40 50 60 70 80 90 ptot (w) vs = 14.4 v rl = 4x2 ohm gaussian noise clip start
diagnostics functional description tda7566 12/29 doc id 9801rev 5 4 diagnostics functional description 4.1 turn-on diagnostic it is activated at the turn-on (standby out) under i 2 c bus request. detectable output faults are: ? short to gnd ?short to v s ? 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 i 2 c reading). if the "standby out" and "diag. enable" commands are both given through a single programming step, the pulse takes place firs t (power stage still in standby 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 figure 17 and 18 show svr and output waveforms at the turn-on (standby out) with and without turn-on diagnostic. ch- ch+ isource vs~5v isink t (ms) i (ma) isink isource ~100ms measure time
tda7566 diagnostics functional description doc id 9801rev 5 13/29 figure 17. svr and output behavior (case 1: without turn-on diagnostic) figure 18. svr and output pin behavior (case 2: with turn-on diagnostic) 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/v s bias (power amp turn-on) t diagnostic enable (permanent) permanent diagnostic acquisition time (100ms typ) permanent diagnostics data (output) permitted time i2cb data vsvr out fault event read data bias (power amp turn-on) permitted time turn-on diagnostic acquisition time (100ms typ) t read data permanent diagnostic acquisition time (100ms typ) permanent diagnostics data (output) permitted time diagnostic enable (turn-on) turn-on diagnostics data (output) permitted time i2cb data vsvr out diagnostic enable (permanent) fault event d01au1253 s.c. to gnd x s.c. to vs 0v 1.8v v s -1.8v v s x normal operation 1.2v v s -1.2v
diagnostics functional description tda7566 14/29 doc id 9801rev 5 concerning short across the speaker / open spea ker, 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 if the line-driver mode (g v = 12 db and line driver mode diagnostic = 1) is selected, the same thresholds will change as follows: figure 21. thresholds for line-drivers 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: 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 i 2 c 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 term inated, the next one is activated by s.c. across load x open load 0v 1.65 45 infinite x normal operation 0.5 85 ac00566 d02au1340 s.c. across load x open load 0 7 180 infinite x normal operation 2 330
tda7566 diagnostics functional description doc id 9801rev 5 15/29 an i 2 c reading. this is to ensure continuous diagnostics throughout the car-radio 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 1 ms time, a sampling of the fault is done figure 23. restart timing with diagnostic enable (permanent) 4.3 output dc offset detection any dc output offset exceeding 2 v 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 v in = 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 th roughout the assigned testing time. this feature is disabled if any overloads leading to activati on of the short-circuit protection occurs in the process. t 1-2ms 1ms 1ms 1ms 1ms overcurrent and short circuit protection intervention (i.e. short circuit to gnd) short circuit removed out t overcurrent and short (i.e. short circuit to gnd) short circuit removed 1ms 100ms 1ms 1ms
diagnostics functional description tda7566 16/29 doc id 9801rev 5 4.4 ac diagnostic it is targeted at detecting accidental disconnection of tweeters in 2-way speaker and, more in general, presence of capacitive (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 frequen cies if the tweeter gets 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: i out > 500mapk = normal status i out < 250mapk = open tweeter to correctly implement this feature, it is nece ssary 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) up to the i 2 c 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 peri od, else an "open twee ter" 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 12345678 1 2 3 5 10 20 30 50 vout (peak) load |z| (ohm) iout (peak) <250ma iout (peak) >500ma low current detection area (open load) d5 = 1 of the dbx byres high current detection area (normal load) d5 = 0 of the dbx bytes
tda7566 diagnostics functional description doc id 9801rev 5 17/29 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 i 2 c reading and faults removal, provided that the diagnostic is enabled. this is true for both kinds of diagnostic (turn on and permanent). 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. 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 recognizable 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 i 2 c bus, 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 i 2 c reading operation. so, when the micro reads the i 2 c, 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 i 2 c. the short to gnd is still presen t in bytes, because it is the result of the previous cycle. if another i 2 c reading operation occurs, the bytes do not show the short). in general to observe a change in diagnostic bytes, two i 2 c reading operations are necessary. table 5. 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. (*)
diagnostics functional description tda7566 18/29 doc id 9801rev 5 4.7 i 2 c programming/r eading 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: (standby out + diag enable) --- 500 ms (min) --- muting out turn-off: muting in --- 20 ms --- (diag disable + standby in) car radio installation: diag enable (write) --- 200 ms --- i 2 c read (repeat until all faults disappear). ac test: feed h.f. tone -- ac diag enable (write) --- wait > 3 cycles --- i 2 c read (repeat i 2 c reading until tweeter-off message disappears). offset test: device in play (no si gnal) -- offset enable - 30ms - i 2 c reading (repeat i 2 c reading until high-offset message disappears).
tda7566 i2c bus interface doc id 9801rev 5 19/29 5 i 2 c bus interface data transmission from microprocessor to the tda7566 and vice versa takes place through the 2 wires i 2 c 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 tran sition 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 sda line is stable low during this clock pulse. * transmitter ? master (p) when it writes an address to the tda7566 ? slave (tda7566) when the p reads a data byte from tda7566 ** receiver ? slave (tda7566) when the p writes an address to the tda7566 ? master (p) when it reads a data byte from tda7566 figure 25. data validity on the i 2 c bus sda scl data line stable, data valid change data allowed d99au1031
i2c bus interface tda7566 20/29 doc id 9801rev 5 figure 26. timing diagram on the i 2 c bus figure 27. timing acknowledge clock pulse scl sda start i 2 cbus stop d99au1032 scl 1 msb 23789 sda start acknowledgment from receiver d99au1033
tda7566 software specifications doc id 9801rev 5 21/29 6 software specifications all the functions of the tda7566 are activated by i 2 c interface. the bit 0 of the "address byte" defines if the next bytes are write instruction (from p to tda7566) or read instruction (from tda7566 to p). chip address x = 0 write to device x = 1 read from device if r/w = 0, the p sends 2 "instruction bytes": ib1 and ib2. d7 d0 1101100xd8 hex table 6. ib1 bit instruction decoding bit 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)
software specifications tda7566 22/29 doc id 9801rev 5 if r/w = 1, the tda7566 sends 4 "diagnostics bytes" to mp: db1, db2, db3 and db4. table 7. ib2 bit instruction decoding bit d7 0 d6 0 d5 0 d4 standby on - amplifier not working - (d4 = 0) standby off - amplifier working - (d4 = 1) d3 power amplifier mode diagnostic (d3 = 0) line driver mode diagnostic (d3 = 1) d2 current detection diagnostic enabled (d2 = 1) current detection diagnostic defeat (d2 = 0) d1 0 d0 0 table 8. db1 bit instruction decoding bit 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)
tda7566 software specifications doc id 9801rev 5 23/29 table 9. db2 bit instruction decoding bit 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) 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)
software specifications tda7566 24/29 doc id 9801rev 5 table 10. db3 bit instruction decoding bit d7 standby 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)
tda7566 software specifications doc id 9801rev 5 25/29 table 11. db4 bit instruction decoding bit d7 x d6 x d5 channel r current detection output peak current < 250 ma - open load (d5 = 1) output peak current > 500 ma - 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)
examples of bytes sequence tda7566 26/29 doc id 9801rev 5 7 examples of bytes sequence 1 - turn-on diagnostic - write operation 2 - turn-on diagnostic - read operation 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. 3b - turn-off of the power amplifier 4 - offset detection procedure enable 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). 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 leakage 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) 7 - current detection reading operation (the results valid only for the current sensor detection bits - d5 of the bytes db1, db2, db3, db4). 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. start address byte with d0 = 0 ack ib1 with d6 = 1 ack ib2 ack stop start address byte with d0 = 1 ack db1 ack db2 ack db3 ack db4 ack stop start address byte with d0 = 0 ack ib1 ack ib2 ack stop x000000x xxx1x0xx start address byte with d0 = 0 ack ib1 ack ib2 ack stop x0xxxxxx xxx0xxxx start address byte with d0 = 0 ack ib1 ack ib2 ack stop xx1xx11x xxx1x0xx start address byte with d0 = 1 ack db1 ack db2 ack db3 ack db4 ack stop start address byte with d0 = 0 ack ib1 ack ib2 ack stop xx01111x xxx1x1xx start address byte with d0 = 1 ack db1 ack db2 ack db3 ack db4 ack stop
tda7566 package information doc id 9801rev 5 27/29 8 package information in order to meet environmental requirements, st offers these devices in different grades of ecopack ? packages, depending on their level of environmental compliance. ecopack ? specifications, grade definitions and product status are available at: www.st.com . ecopack ? is an st trademark. figure 28. flexiwatt25 mechanical data and package dimensions outline and mechanical data dim. mm inch min. typ. max. min. typ. max. a 4.45 4.50 4.65 0.175 0.177 0.183 b 1.80 1.90 2.00 0.070 0.074 0.079 c 1.40 0.055 d 0.75 0.90 1.05 0.029 0.035 0.041 e 0.37 0.39 0.42 0.014 0.015 0.016 f (1) 0.57 0.022 g 0.80 1.00 1.20 0.031 0.040 0.047 g1 23.75 24.00 24.25 0.935 0.945 0.955 h (2) 28.90 29.23 29.30 1.139 1.150 1.153 h1 17.00 0.669 h2 12.80 0.503 h3 0.80 0.031 l (2) 22.07 22.47 22.87 0.869 0.884 0.904 l1 18.57 18.97 19.37 0.731 0.747 0.762 l2 (2) 15.50 15.70 15.90 0.610 0.618 0.626 l3 7.70 7.85 7.95 0.303 0.309 0.313 l4 5 0.197 l5 3.5 0.138 m 3.70 4.00 4.30 0.145 0.157 0.169 m1 3.60 4.00 4.40 0.142 0.157 0.173 n 2.20 0.086 o 2 0.079 r 1.70 0.067 r1 0.5 0.02 r2 0.3 0.12 r3 1.25 0.049 r4 0.50 0.019 v1 3? (typ.) v5? (tp.) v2 20? (typ.) v3 45? (typ.) (2): molding protusion included (1): dam-bar protusion not included flexiwatt25 (vertical) h3 r4 g v g1 l2 h1 h f m1 l flex25me v3 o l3 l4 h2 r3 n v2 r r2 r2 c b l1 m r1 l5 r1 r1 e d a pin 1 v v1 v1 7034862
revision history tda7566 28/29 doc id 9801rev 5 9 revision history table 12. document revision history date revision changes 20-sep-2003 1 initial release. 12-jul-2006 2 document reformatted. corrected the values of i nl and i ol parameters in the ta bl e 4 : electrical characteristics . 18-dec-2006 3 updated figure 20 and 21 . 29-sep-2008 4 updated table 4: electrical characteristics . updated figure 20 . 11-oct-2010 5 modified section table 1.: device summary on page 1 .
tda7566 doc id 9801rev 5 29/29 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 he rein at any time, without notice. all st products are sold pursuant to st?s terms and conditions of sale. purchasers are solely responsible for the choice, selection and use of the st products and services described herein, and st as sumes no liability whatsoever relating to the choice, selection or use of the st products and services described herein. no license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted under this document. i f any part of this document refers to any third party products or services it shall not be deemed a license grant by st for the use of such third party products or services, or any intellectual property contained therein or considered as a warranty covering the use in any manner whatsoev er of such third party products or services or any intellectual property contained therein. unless otherwise set forth in st?s terms and conditions of sale st disclaims any express or implied warranty with respect to the use and/or sale of st products including without limitation implied warranties of merchantability, fitness for a parti cular purpose (and their equivalents under the laws of any jurisdiction), or infringement of any patent, copyright or other intellectual property right. unless expressly approved in writing by an authorized st representative, st products are not recommended, authorized or warranted for use in milita ry, air craft, space, life saving, or life sustaining applications, nor in products or systems where failure or malfunction may result in personal injury, death, or severe property or environmental damage. st products which are not specified as "automotive grade" may only be used in automotive applications at user?s own risk. resale of st products with provisions different from the statements and/or technical features set forth in this document shall immediately void any warranty granted by st for the st product or service described herein and shall not create or extend in any manner whatsoev er, any liability of st. st and the st logo are trademarks or registered trademarks of st in various countries. information in this document supersedes and replaces all information previously supplied. the st logo is a registered trademark of stmicroelectronics. all other names are the property of their respective owners. ? 2010 stmicroelectronics - all rights reserved stmicroelectronics group of companies australia - belgium - brazil - canada - china - czech republic - finland - france - germany - hong kong - india - israel - ital y - japan - malaysia - malta - morocco - philippines - singapore - spain - sweden - switzerland - united kingdom - united states of america www.st.com

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