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september 2006 rev 1 1/30 30 TDA7564B 4 x 50w multifunction quad power amplifier with built-in diagnostics features features multipower bcd technology mosfet output power stage dmos power output new hi-efficiency (class sb) high output power capability 4x28w/4 @ 14.4v, 1khz, 10% thd, 4x50w max, power max. output power 4x72w/2 full i 2 c bus driving: ?st-by ? independent front/rear soft play/mute ? selectable gain (for low noise line output function) ? high efficiency enable/disable ?i 2 c bus digital diagnostics (including ac and dc load detection) full fault protection dc offset detection four independent short circuit protection clipping detector (2%/10%) linear thermal shutdown with multiple thermal warning esd protection description the TDA7564B 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 TDA7564B has a very low distortion allowing a clear powerful sound. among the features, its superior efficiency performance coming from the internal exclusive structure, makes it the most suitable device to simplify the thermal management in high power sets. the dissipated output power under average listening condition is in fact reduced up to 50% when compared to the level provided by conventional class ab solu tions. this device is equipped with a full diagnostics array that communicates the status of each speaker through the i 2 c bus . order codes flexiwatt25 (vertical) flexiwatt25 (horizontal) part number package packing TDA7564B flexiwatt25 (vertical) tube TDA7564Bh flexiwatt25 (horizontal) tube www.st.com 4 .com datasheet u
contents TDA7564B 2/30 contents 1 block diagrams and application ci rcuit . . . . . . . . . . . . . . . . . . . . . . . . . . 4 2 pins description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 3 electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 3.1 absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 3.2 thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 3.3 electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 3.4 electrical characteristics curves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 5 multiple faults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 5.1 faults availability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 6 thermal protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 6.1 i2c programming/reading sequences . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 7 fast muting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 8i 2 c bus interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 8.0.1 data validity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 8.0.2 start and stop conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 8.0.3 byte format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 8.0.4 acknowledge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 9 software specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 10 examples of bytes sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 4 .com datasheet u
TDA7564B contents 3/30 11 package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 12 revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 4 .com datasheet u
block diagrams and application circuit TDA7564B 4/30 1 block diagrams and application circuit figure 1. block diagram figure 2. application circuit i2cbus thermal protection & dump reference cd_out data clk out rf+ short circuit protection & diagnostic clip detector mute1 mute2 12/26db vcc2 vcc1 12/26db 12/26db 12/26db short circuit protection & diagnostic short circuit protection & diagnostic short circuit protection & diagnostic out rf- out rr+ out rr- out lf+ out lf- out lr+ out lr- ac_gnd rf rr lf pw_gnd lr in lr s_gnd tab svr in lf in rr in rf d00au1211 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 4 .com datasheet u
TDA7564B pins description 5/30 2 pins description figure 3. flexiwatt25 vertical pins connection diagram (top of view) figure 4. flexiwatt25 horizontal pins connection diagram (top of 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 au1037_h 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 4 .com datasheet u
electrical specifications TDA7564B 6/30 3 electrical specifications 3.1 absolute maximum ratings 3.2 thermal data 3.3 electrical characteristics refer to the test circuit, v s = 14.4v; r l = 4 ; f = 1khz; g v = 30db; t amb = 25c; unless otherwise specified. table 1. 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 = 50ms) 50 v v ck ck pin voltage 6 v v data data pin voltage 6 v i o output peak current (not repetitive t = 100ms) 8 a i o output peak current (re petitive f > 10hz) 6 a p tot power dissipation t case = 70c 85 w t stg , t j storage and junction temperature -55 to 150 c table 2. thermal data symbol parameter value unit r th j-case thermal resistance junction to case max. 1c/w table 3. electrical characteristics symbol parameter test condition min. typ. max. unit power amplifier v s supply voltage range 8 18 v i d total quiescent drain current 170 300 ma p o output power max. power (v s = 15.2v, square wave input (2vrms)) 50 w thd = 10% thd = 1% 25 20 28 22 w w 4 .com datasheet u
TDA7564B electrical specifications 7/30 p o output power r l = 2 ; eiaj (v s = 13.7v) r l = 2 ; thd 10% r l = 2 ; thd 1% r l = 2 ; max power 55 40 32 60 68 50 40 75 w w w w thd total harmonic distortion p o = 1w to 10w; std mode he mode; p o = 1.5w he mode; p o = 8w 0.02 0.015 0.15 0.1 0.1 0.5 % % % g v = 12db; std mode v o = 0.1 to 5vrms 0.02 0.05 % c t cross talk f = 1khz to 10khz, r g = 600 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 1 db g v2 voltage gain 2 11 12 13 db g v2 voltage gain match 2 -1 1 db e in1 output noise voltage 1 r g = 600 20hz to 22khz 35 100 v e in2 output noise voltage 2 r g = 600 ; gv = 12db 20hz to 22khz 12 30 v svr supply voltage rejection f = 100hz to 10khz; v r = 1vpk; r g = 600 50 60 db bw power bandwidth 100 khz a sb stand-by attenuation 90 110 db i sb stand-by current v st-by = 0 25 50 a a m mute attenuation 80 100 db v os offset voltage mute & play -100 0 100 mv v am min. supply mute threshold 7 7.5 8 v cmrr input cmrr v cm = 1vpk-pk; rg = 0 55 db t on turn on delay d2/d1 (ib1) 0 to 1 20 40 ms t off turn off delay d2/d1 (ib1) 1 to 0 20 40 ms cd lk clip det high leakage current cd off 0 5 a cd sat clip det sat. voltage cd on; i cd = 1ma 150 300 mv cd thd clip det thd level d0 (ib1) = 1 5 10 15 % d0 (ib1) = 0 1 2 3 % table 3. electrical characteristics (continued) symbol parameter test condition min. typ. max. unit 4 .com datasheet u
electrical specifications TDA7564B 8/30 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 st-by 1.2 v pvs short to vs det. (above this limit, the output isconsidered in short circuit to v s ) 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. 0.5 lop open load det. 85 lnop normal load det. 1.75 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 st-by 1.2 v pvs short to vs det. (above this limit, the output isconsidered 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 1.2 v 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 shorted load det. pow. amp. mode 0.5 line driver mode 2 v o offset detection power amplifier in play, ac input signals = 0 1.5 2 2.5 v table 3. electrical characteristics (continued) symbol parameter test condition min. typ. max. unit 4 .com datasheet u
TDA7564B electrical specifications 9/30 3.4 electrical characteristics curves i nlh normal load current detection v o < (v s - 5)pk ib2 (d7) = 0 500 ma i nll normal load current detection v o < (v s - 5)pk ib2 (d7) = 1 250 ma i olh open load current detection v o < (v s - 5)pk ib2 (d7) = 0 250 ma i oll open load current detection v o < (v s - 5)pk ib2 (d7) =1 125 ma i 2 c bus interface s cl clock frequency 400 khz v il input low voltage 1.5 v v ih input high voltage 2.3 v figure 5. quiescent current vs. supply voltag e figure 6. output power vs. supply voltage (4 ) figure 7. output power vs. supply voltage (2 ) figure 8. distortion vs. output power (4 , std) table 3. electrical characteristics (continued) symbol parameter test condition min. typ. max. unit 8 1012141618 vs ( v ) 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 % thd = 1 % po-max 8 9 10 11 12 13 14 15 16 vs ( v ) 10 20 30 40 50 60 70 80 90 100 po (w) rl = 2 ohm f = 1 khz thd = 10 % thd = 1 % po-max po ( w ) 0.1 1 10 0.01 0.1 1 10 thd (%) f = 10 khz f = 1 khz standard mode vs = 14.4 v rl = 4 ohm 4 .com datasheet u
electrical specifications TDA7564B 10/30 figure 9. distortion vs. output power (4 , hi- eff) figure 10. distortion vs. output power (2 , std) figure 11. distortion vs. frequency (4 ) figure 12. distortion vs. frequency (2 ) figure 13. crosstalk vs. frequency figure 14. supply voltage rejection vs. freq. 0.1 1 10 po ( w ) 0.001 0.01 0.1 1 10 thd (%) f = 10 khz f = 1 khz hi-eff mode vs = 14.4 v rl = 4 ohm 0.1 1 10 po ( w ) 0.01 0.1 1 10 thd (%) f = 10 khz f = 1 khz standard mode vs = 14.4 v rl = 2 ohm 10 100 1000 10000 f ( hz ) 0.01 0.1 1 10 thd (%) standard mode vs = 14.4 v rl = 4 ohm po = 4 w 10 100 1000 10000 f ( hz ) 0.1 1 10 thd (%) standard mode 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) standard mode 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) std & he mode rg = 600 ohm vripple = 1 vpk 4 .com datasheet u
TDA7564B electrical specifications 11/30 figure 15. power dissipation & efficiency vs. output power (4 , std, sine) figure 16. power dissipation & efficiency vs. output power (4w, hi-eff, sine) figure 17. power dissipation vs. average ouput power (audio program simulation, 4 ) figure 18. power dissipation vs. average ouput power (audio program simulation, 2 ) 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 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 (%) ptot standard mode vs = 14.4 v rl = 4 x 4 ohm f = 1 khz sine n 0.1 1 10 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 hi-eff mode vs = 14.4 v rl = 4 x 4 ohm f = 1 khz sine 012345 po ( w ) 0 5 10 15 20 25 30 35 40 45 ptot (w) vs = 14 v rl = 4 x 4 ohm gaussian noise std mode hi-eff mode clip start 0123456789 po ( w ) 0 10 20 30 40 50 60 70 80 90 ptot (w) vs = 14 v rl = 4 x 2 ohm gaussian noise std mode hi-eff mode clip start 4 .com datasheet u
diagnostics functional description TDA7564B 12/30 4 diagnostics functional description 4.1 turn-on diagnostic it is activated at the turn-on (stand-by out) under i 2 cbus 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 (fig. 19) 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 "stand-by out" and "diag. enable" commands are both given through a single programming step, the pulse takes place firs t (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 19. turn - on diagnostic: working principle figure 20 and 21 show svr and output waveforms at the turn-on (stand-by out) with and without turn-on diagnostic. figure 20. svr and output behaviour (case 1: without turn-on diagnostic) ch- ch+ isource vs~5v isink t (ms) i (ma) isink isource ~100ms measure time 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 4 .com datasheet u
TDA7564B diagnostics functional description 13/30 figure 21. svr and output pin behaviour (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 22. 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 23. if the line-driver mode (gv= 12 db and line driver mode diagnostic = 1) is selected, the same thresholds will change as follows: figure 24. 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 s.c. across load x open load 0v 1.75 45 infinite x normal operation 0.5 85 d01au1327 d02au1340 s.c. across load x open load 0 7 180 infinite x normal operation 2 330 4 .com datasheet u
diagnostics functional description TDA7564B 14/30 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 the TDA7564B 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 25 ). 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 26 ): ? 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 by 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 25. restart timing without diagnostic enable (permanent) - each 1ms time, a sampling of the fault is done figure 26. restart timing with diagnostic enable (permanent) 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 circuit protection intervention (i.e. short circuit to gnd) short circuit removed 1-2ms 100/200ms 1ms 1ms 4 .com datasheet u
TDA7564B diagnostics functional description 15/30 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 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 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. 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 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, and it is enabled by setting (ib2-d2) = 1. two different detection levels are available: ? high current threshold ib2 (d7) = 0 iout > 500mapk = normal status iout < 250mapk = open tweeter ? low current threshold ib2 (d7) = 1 iout > 250mapk = normal status iout < 125mapk = 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 with ib2(d7)=0 ( higher than 250mapk with ib2(d7)=1) in normal conditions and lower than 250mapk with ib2(d7)=0 (lower than 125mapk with ib2(d7)=1) 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 the aboove threholds over all the measuring period, el se 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. 4 .com datasheet u
diagnostics functional description TDA7564B 16/30 figure 27 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 27. current detection high: load impedance |z| vs. output peak voltage figure 28. current detection low: load impedance |z| vs. output peak voltage 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 ib2(d7) = 0 0.5 1 1.5 2 2.5 3 3.5 4 1 2 3 5 10 20 30 50 vout (peak) load |z| (ohm) iout (peak) <125ma iout (peak) >250ma low current detection area (open load) d5 = 1 of the dbx byres high current detection area (normal load) d5 = 0 of the dbx bytes ib2(d7) = 1 4 .com datasheet u
TDA7564B multiple faults 17/30 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 rr, 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). 5.1 faults availability all the results coming from i 2 cbus, 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. to guarantee always resident functions, every kind of diagnostic cycles (turn on, permanent, offset) 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 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. (*) 4 .com datasheet u
thermal protection TDA7564B 18/30 6 thermal protection thermal protection is implemented through thermal foldback ( figure 29 ). thermal foldback begins limiting the audio input to the amplifier stage as the junction temperatures rise above the normal operating range. this effectively limits the output power capability of the device thus reducing the te mperature to acceptable levels without totally interrupting the operation of the device. the output power will decrease to the point at which ther mal equilibrium is reached. thermal equilibrium will be reached when the reduction in output power reduces the dissipated power such that the die temperature falls below the thermal foldback threshold. should the device cool, the audio level will in crease until a new thermal equilibrium is reached or the amplifier reaches full power. thermal foldback will reduce the audio output level in a linear manner. three thermal warning are available through the i 2 c bus data. figure 29. thermal foldback diagram 6.1 i 2 c programming/reading sequences 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) 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). tj ( c) th. sh. start th. sh. end vout th. warn. on tj ( c) vout tj ( c) sd (with same input signal) < t sd cd out th. warn. on th. warn. on 125 140 155 > t 4 .com datasheet u
TDA7564B fast muting 19/30 7 fast muting the muting time can be shortened to less than 1.5ms by setting (ib2) d5 = 1. this option can be useful in transient battery situations (i.e. during car engine cranking) to quickly turnoff the amplifier for avoiding any audible effects caused by noise/transients being injected by preamp stages. the bit must be set back to ?0? shortly after the mute transition. 4 .com datasheet u
i 2 c bus interface TDA7564B 20/30 8 i 2 c bus interface data transmission from microprocessor to the TDA7564B and viceversa 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). 8.0.1 data validity as shown by figure 30 , 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. 8.0.2 start and stop conditions as shown by figure 31 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. 8.0.3 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. 8.0.4 acknowledge the transmitter* puts a resistive high level on the sda line during the acknowledge clock pulse (see figure 32 ). 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 ( p) when it writes an address to the TDA7564B ? slave (TDA7564B) when the p reads a data byte from TDA7564B ** receiver ? slave (TDA7564B) when the p writes an address to the TDA7564B ? master (p) when it reads a data byte from TDA7564B figure 30. data validity on the i 2 cbus sda scl data line stable, data valid change data allowed d99au1031 4 .com datasheet u
TDA7564B i 2 c bus interface 21/30 figure 31. timing diagram on the i 2 cbus figure 32. acknowledge on the i 2 cbus scl sda start i 2 cbus stop d99au1032 scl 1 msb 23789 sda start acknowledgment from receiver d99au1033 4 .com datasheet u
software specifications TDA7564B 22/30 9 software specifications all the functions of the TDA7564B are activated by i 2 c interface. the bit 0 of the "address byte" defines if the next bytes are write in struction (from p to TDA7564B) or read instruction (from TDA7564B to p). x = 0 write to device x = 1 read from device if r/w = 0, the p sends 2 "instruction bytes": ib1 and ib2. table 5. chip address: d7 d0 1101100xd8 hex 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 clip detector 2% (d0 = 0) clip detector 10% (d0 = 1) table 7. ib2 d7 current detection threshold high th (d7 = 0) low th (d7 =1) d6 0 d5 normal muting time (d5 = 0) fast muting time (d5 = 1) d4 stand-by on - amplifier not working - (d4 = 0) stand-by off - amplifier working - (d4 = 1) 4 .com datasheet u
TDA7564B software specifications 23/30 if r/w = 1, the TDA7564B sends 4 "diagnostics bytes" to p: db1, db2, db3 and db4. 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 right channels power amplifier working in standard mode (d1 = 0) power amplifier working in high efficiency mode (d1 = 1) d0 left channels power amplifier working in standard mode (d0 = 0) power amplifier working in high efficiency mode (d0 = 1) table 7. ib2 (continued) table 8. db1 d7 thermal warning 1 active (d7 = 1) t=155 c d6 diag. cycle not activated or not terminated (d6 = 0) diag. cycle terminated (d6 = 1) d5 channel lf current detection ib2 (d7) = 0 output peak current < 250 ma - open load (d5 = 1) output peak current > 500 ma - normal load (d5 = 0) channel lf current detection ib2 (d7) = 1 output peak current < 125 ma - open load (d5 = 1) output peak current > 250 ma - normal 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) 4 .com datasheet u
software specifications TDA7564B 24/30 table 9. 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 ib2 (d7) = 0 output peak current < 250 ma - open load (d5 = 1) output peak current > 500 ma - normal load (d5 = 0) channel lr current detection ib2 (d7) = 1 output peak current < 250 ma - open load (d5 = 1) output peak current > 500 ma - normal 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) table 10. db3 d7 stand-by status (= ib1 - d4) d6 diagnostic status (= ib1 - d6) d5 channel rf current detection ib2 (d7) = 0 output peak current < 250 ma - open load (d5 = 1) output peak current > 500 ma - normal load (d5 = 0) channel rf current detection ib2 (d7) = 1 output peak current < 250 ma - open load (d5 = 1) output peak current > 500 ma - normal 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) 4 .com datasheet u
TDA7564B software specifications 25/30 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) table 10. db3 (continued) d7 stand-by status (= ib1 - d4) table 11. db4 d7 thermal warning 2 active (d7 =1) t=140c d6 thermal warning 3 active (d6 =1) t=125c d5 channel rr current detection ib2 (d7) = 0 output peak current < 250 ma - open load (d5 = 1) output peak current > 500 ma - normal load (d5 = 0) channel rr current detection ib2 (d7) = 1 output peak current < 250 ma - open load (d5 = 1) output peak current > 500 ma - normal 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) 4 .com datasheet u
examples of bytes sequence TDA7564B 26/30 10 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 1 ms 3a - turn-on of the power amplifier with 26db gain, mute on, diagnostic defeat, high eff. mode both channels. . 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 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) 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 xxx1x011 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 4 .com datasheet u
TDA7564B package information 27/30 11 package information in order to meet environmental requirements, st offers these devices in ecopack ? packages. these packages 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 33. flexiwatt25 (horizontal) mechanical data & 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 2.00 0.079 e 0.37 0.39 0.42 0.014 0.015 0.016 f (1) 0.57 0.022 g 0.75 1.00 1.25 0.029 0.040 0.049 g1 23.70 24.00 24.30 0.933 0.945 0.957 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) 21.64 22.04 22.44 0.852 0.868 0.883 l1 10.15 10.5 10.85 0.40 0.413 0.427 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 5.15 5.45 5.85 0.203 0.214 0.23 l6 1.80 1.95 2.10 0.070 0.077 0.083 m 2.75 3.00 3.50 0.108 0.118 0.138 m1 4.73 0.186 m2 5.61 0.220 n 2.20 0.086 p 3.20 3.50 3.80 0.126 0.138 0.15 r 1.70 0.067 r1 0.50 0.02 r2 0.30 0.12 r3 1.25 0.049 r4 0.50 0.02 v5? (typ.) v1 3? (typ.) v2 20? (typ.) v3 45? (typ.) flexiwatt25 (horizontal) 7399733 a (1): dam-bar protusion not included; (2): molding protusion included 4 .com datasheet u
package information TDA7564B 28/30 figure 34. flexiwatt25 (vertical) mechanical data & 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 4 .com datasheet u
TDA7564B revision history 29/30 12 revision history table 12. document revision history date revision changes 14-sep-2006 1 intial release. 4 .com datasheet u
TDA7564B 30/30 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. ? 2006 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 - singapore - spain - sweden - switzerland - united kingdom - united states of america www.st.com 4 .com datasheet u

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