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dynamic differential hall effect sensor ic TLE4921-5U bipolar ic data sheet 1 2002-08-02 p-sso-4-1 features ? advanced performance ? high sensitivity ? symmetrical thresholds ? high piezo resistivity ? reduced power consumption ? south and north pole pre-induction possible ? ac coupled ? digital output signal ? two-wire and three-wire configuration possible ? large temperature range ? large airgap ? low cut-off frequency ? protection against overvoltage ? protection against reversed polarity ? output protection against electrical disturbances type marking ordering code package TLE4921-5U 21c5u q62705-k664 psso4-1 the differential hall effect sensor tle 4921-5u provides a high sensitivity and a superior stability over temperature and symmetrical thresholds in order to achieve a stable duty cycle. tle 4921-5u is particularly suitable for rotational speed detection and timing applications of ferromagnetic toothed wheels such as anti-lock braking systems, transmissions, crankshafts, etc. the integrated circuit (based on hall effect) provides a digital signal output with frequency proportional to the speed of rotation. unlike other rotational sensors differential hall ics are not influenced by radial vibration within the effective airgap of the sensor and require no external signal processing.
TLE4921-5U data sheet 2 2002-08-02 pin configuration (view on branded side of component) aep01694 v s gnd c 34 1 1.53 2.67 center of sensitive area ?.15 2 q 2.5 figure 1 pin definitions and functions pin no. symbol function 1 v s supply voltage 2 q output 3 gnd ground 4 c capacitor
TLE4921-5U data sheet 3 2002-08-02 aeb01695 schmitt- trigger amplifier highpass- filter hall-probes v (3v) protection device internal reference and supply 1 v s 2 q 4 c open collector protection device gnd reg 3 f figure 2 block diagram
TLE4921-5U data sheet 4 2002-08-02 functional description the differential hall sensor ic detects the motion and position of ferromagnetic and permanent magnet structures by measuring the differential flux density of the magnetic field. to detect ferromagnetic objects the magnetic field must be provided by a back biasing permanent magnet ( south or north pole of the magnet attached to the rear unmarked side of the ic package). using an external capacitor the generated hall voltage signal is slowly adjusted via an active high pass filter with a low cut-off frequency. this causes the output to switch into a biased mode after a time constant is elapsed. the time constant is determined by the external capacitor. filtering avoids ageing and temperature influence from schmitt-trigger input and eliminates device and magnetic offset. the tle 4921-5u can be exploited to detect toothed wheel rotation in a rough environment. jolts against the toothed wheel and ripple have no influence on the output signal. furthermore, the tle 4921-5u can be operated in a two-wire as well as in a three- wire-configuration. the output is logic compatible by high/low levels regarding on and off. circuit description (see figure 2) the tle 4921-5u is comprised of a supply voltage reference, a pair of hall probes spaced at 2.5 mm, differential amplifier, filter for offset compensation, schmitt trigger, and an open collector output. the tle 4921-5u was designed to have a wide range of application parameter variations. differential fields up to 80 mt can be detected without influence to the switching performance. the pre-induction field can either come from a magnetic south or north pole, whereby the field strength up to 500 mt or more will not influence the switching points. the improved temperature compensation enables a superior sensitivity and accuracy over the temperature range. finally the optimised piezo compensation and the integrated dynamic offset compensation enable easy manufacturing and elimination of magnet offsets. protection is provided at the input/supply (pin 1) for overvoltage and reverse polarity and against over-stress such as load dump, etc., in accordance with iso-tr 7637 and din 40839. the output (pin 2) is protected against voltage peaks and electrical disturbances.
TLE4921-5U data sheet 5 2002-08-02 absolute maximum ratings t j = ? 40 to 150 c limit values parameter symbol min. max. unit remarks supply voltage v s ? 35 1) 30 v ? output voltage v q ? 0.7 30 v ? output current i q ?50ma? output reverse current ? i q ?50ma? capacitor voltage v c ? 0.3 3 v ? junction temperature junction temperature junction temperature junction temperature t j t j t j t j ? ? ? ? 150 160 170 210 c c c c 5000 h 2500 h 1000 h 40 h storage temperature t s ? 40 150 c ? thermal resistance p-sso-4-1 r th ja ? 190 k/w ? current through input- protection device current through output- protection device i sz i qz ? ? 200 200 ma ma t < 2 ms; v = 0.1 t < 2 ms; v = 0.1 electro magnetic compatibility ref. din 40839 part 1; test circuit 1 testpulse 1 testpulse 2 testpulse 3a testpulse 3b testpulse 4 testpulse 5 v ld v ld v ld v ld v ld v ld level iv level iv level iv level iv level iv level iv -100 v 100 v -150v 100v -7v 86,5v c b c c c c 1) reverse current < 10ma note: stresses above those listed here may cause permanent damage to the device. exposure to absolute maximum rating conditions for extended periods may affect device reliability.
TLE4921-5U data sheet 6 2002-08-02 esd protection human body model (hbm) tests according to: parameter symbol max. unit remarks esd ? protection v esd 2 kv according to standard eia/jesd22-a114-b hbm operating range limit values parameter symbol min. max. unit remarks supply voltage v s 4.5 24 v ? junction temperature t j ? 40 170 c ? pre-induction b 0 ? 500 500 mt at hall probe; independent of magnet orientation differential induction ? b ? 80 80 mt ? note: in the operating range the functions given in the circuit description are fulfilled. ac/dc characteristics limit values parameter sym- bol min. typ. max. unit test conditions test circuit supply current (1) i s 3.8 4.3 5.3 5.9 8.0 8.8 ma ma v q = high i q = 0 ma v q = low i q = 40 ma 1 1 output saturation voltage v qsat ? 0.25 0.6 v i q = 40 ma 1 output leakage current i ql ??50 a v q <= 24 v 1 centre of switching points: ( ? ? ? ? b op + ? ? ? ? b rp )/2 ? ? ? ? b m ? 1 0 1 mt ? 20 mt < ? ? ? ? b < 20 mt 2)3) f = 200 hz 2 operate point ? b op ??0mt f = 200 hz, ? b = 20 mt 2
TLE4921-5U data sheet 7 2002-08-02 release point ? b rp 0??mt f = 200 hz, ? b = 20 mt 2 hysteresis ? b hy 0.5 1.5 2.5 mt f = 200 hz, ? b = 20 mt 2 overvoltage protection at supply voltage at output v sz v qz 27 27 ? ? 35 35 v v i s = 16 ma i q = 16 ma 1 1 output rise time t r ??0.5 s i q = 40 ma c l = 10 pf 1 ac/dc characteristics (cont?d) limit values parameter sym- bol min. typ. max. unit test conditions test circuit output fall time t f ??0.5 s i q = 40 ma c l = 10 pf 1 delay time t dop t drp t dop - t drp ? ? ? ? ? 0 25 10 15 s s s f = 10 khz ? b = 5 mt 2 filter input resistance r c 35 43 52 k ? 25 c 2 c 1 filter sensitivity to ? b s c ?? 5? mv/ mt ?1 filter bias voltage v c 1.6 2 2.4 v ? b = 0 1 frequency f 4) ? 20000 hz ? b = 5 mt 2 resistivity against mechanical stress (piezo) ? b m ? b h y ? 0.1 ? 0.1 ?0.1 0.1 mt mt f = 2 n 2 2) the current consumption characteristic will be different and the specified values can slightly change 3) leakage currents at pin 4 should be avoided. the bias shift of b m caused by a leakage current i l can be calculated by: ? b m = ( i l r c (t))/ s c (t) 4) for higher ? b the values may exceed the limits like following | ? b m | < |0.05 ? b | 5) depends on filter capacitor c f . the cut-off frequency is given by f = 1/(2 r c c f ). the switching points are guaranteed over the whole frequency range, but amplitude modification and phase shift due to the 1 st order high-pass filter have to be taken into account. note: the listed characteristics are ensured over the operating range of the integrated circuit. typical characteristics specify mean values expected over the production spread. if not otherwise specified, typical characteristics apply at t j = 25 = c and the given supply voltage.
TLE4921-5U data sheet 8 2002-08-02 aes01696 s v q gnd qsat v 2 1 4 3 v qz , r l r p 4.7 nf s v sz v s ld v 300 ? c c v c l c 1) 1) r c c v c ? ? = , q qr figure 3 test circuit 1 aes01258 s v q gnd q v 2 1 4 3 1 k b op b hy ? ? f v s c min f max nf ? 470 c f figure 4 test circuit 2
TLE4921-5U data sheet 9 2002-08-02 application configurations two possible applications are shown in figure 7 and figure 8 (toothed and magnet wheel). the difference between two-wire and three-wire application is shown in figure 9 . gear tooth sensing in the case of ferromagnetic toothed wheel application the ic has to be biased by the south or north pole of a permanent magnet (e.g. smco 5 (vacuumschmelze vx145)) with the dimensions 8 mm 5 mm 3 mm) which should cover both hall probes. the maximum air gap depends on ? the magnetic field strength (magnet used; pre-induction) and ? the toothed wheel that is used (dimensions, material, etc.; resulting differential field) a centred distance of hall probes b hall probes to ic surface l ic surface to tooth wheel a = 2.5 mm b = 0.3 mm b l a n s aea01259 figure 5 sensor spacing d t aea01260 conversion din ? asa m = 25.4 mm/p t = 25.4 mm cp din d diameter (mm) z number of teeth m module m = d / z (mm) t pitch t = = m (mm) asa p diameter pitch p = z / d (inch) pd pitch diameter pd = z / p (inch) cp circular pitch cp = 1 inch = / p figure 6 toothed wheel dimensions
TLE4921-5U data sheet 10 2002-08-02 signal circuitry processing (s) n (n) s hall sensor 1 aea01261 permanent magnet gear wheel hall sensor 2 figure 7 tle 4921-5u, with ferromagnetic toothed wheel magnet wheel n processing circuitry signal hall sensor 1 s hall sensor 2 aea01262 s figure 8 tle 4921-5u, with magnet wheel
TLE4921-5U data sheet 11 2002-08-02 aes01263 s v gnd q c c f 2 1 3 s v v signal line sensor mainframe r l 4 s r 470 nf two-wire-application r = s ? l 330 = r for example : 120 ? aes01264 s v gnd q c 2 1 3 p r s v v signal line sensor mainframe r l 4 three-wire-application 470 nf f c 4.7 nf 4.7 nf for example : r = 330 l ? p 0 = r 330 ? ... figure 9 application circuits
TLE4921-5U data sheet 12 2002-08-02 aed01697 b1 b2 14 missing tooth wheel profile magnetic field difference b = b2-b1 b rp = ? large airgap small airgap b hys s v q output signal operate point : release point : b2 b2 b hys op b + b = rp switches the output on = ? b op v q ( rp ? b switches the output off ( q v = 0.75 mt -0.75 mt ? = op b the magnetic field is defined as positive if the south pole of the magnet shows towards the rear side of the ic housing. (n) high) low) - -b1 b1 < > ? ??? ? n (s) figure 10 system operation
tle 4921-5u data sheet 13 2002-08-02 quiescent current versus supply voltage i out = 40ma 0,0 1,0 2,0 3,0 4,0 5,0 6,0 7,0 8,0 9,0 10,0 0 5 10 15 20 25 vs [v] is [ma] is on is off is diff quiescent current versus temperature i on = 40 ma 0,0 2,0 4,0 6,0 8,0 10,0 -50 -30 -10 10 30 50 70 90 110 130 150 170 190 210 tj [c] is [ma] is o n is o ff is diff
TLE4921-5U data sheet 14 2002-08-02 quiescent current versus output current vs = 12v 0,0 1,0 2,0 3,0 4,0 5,0 6,0 7,0 8,0 9,0 10,0 0 1020304050 iout [m a] is [ma] is on saturation voltage versus temperature vs= 4,5v iout =50ma 0 50 100 150 200 250 300 350 400 -50 0 50 100 150 200 tj [c] vout [mv]
TLE4921-5U data sheet 15 2002-08-02 saturation voltage versus supply voltage iout= 40ma tj = 25c 0,000 0,050 0,100 0,150 0,200 0,250 0,300 0,350 0,400 0 5 10 15 20 25 30 vs [v] v out [v] output saturation voltage vs. iout @ 25c tj iout +/-50ma, vs=4,5v -400 -300 -200 -100 0 100 200 300 -60 -40 -20 0 20 40 60 iout [ma] out sat voltage [mv]
TLE4921-5U data sheet 16 2002-08-02 hysteresis versus temperature bhy = brp-bop f = 200hz 0 1 2 3 -60 -40 -20 0 20 40 60 80 100 120 140 160 180 200 tj [c] bhy [mt] typ max min center of switching points versus temperature bm = (bop+brp )/2 f = 200hz -2 -1 0 1 2 -60 -40 -20 0 20 40 60 80 100 120 140 160 180 200 tj [c] bm [mt] max typ min
TLE4921-5U data sheet 17 2002-08-02 minimum switching field versus frequency c f =1 0,0 0,5 1,0 1,5 0,01 0,1 1 10 100 f [khz] bmin [mt] tj= 25c tj= -40c minimum switching field versus frequency c f =1 0,0 0,5 1,0 1,5 0,01 0,1 1 10 100 f [khz] bmin [mt] tj=150c tj=170c
TLE4921-5U data sheet 18 2002-08-02 delay time betw een switching threshold ? ? ? ? b and rising edge of vout at tj = 25c sw itching points related to initial measurement @ ? b = 2mt, f =200hz 0 5 10 15 20 25 0 5000 10000 15000 20000 25000 f [hz] t dop [s] "delta b = 2mt" "delta b = 5mt" delay time between switching threshold ? ? ? ? b and falling edge of vout at tj = 25c sw itc hing points related to initial meas urement @ ? b = 2mt, f =200hz 0 5 10 15 20 25 0 5000 10000 15000 20000 25000 f [hz] t dop [s] delta b = 2mt delta b = 5mt
TLE4921-5U data sheet 19 2002-08-02 delay time versus differential field sw itching points related to initial measurement @ ? b = 2 mt, f = 200 hz 4 5 6 7 8 9 10 0 102030405060708090 b[mt] td [s] td rp td op delay time versus temperature sw itc hing points related to initial meas urement @ ? b 2 mt, f= 200 hz 5,00 5,50 6,00 6,50 7,00 7,50 8,00 8,50 -60 -10 40 90 140 t[c] t [s] td rp td op
TLE4921-5U data sheet 20 2002-08-02 rise and fall time versus output current tj = 25c 0 20 40 60 80 100 120 0 20406080100 iout [ma] t [ns] tr tf rise and fall time versus temperature i ou = 40 ma 10 15 20 25 30 35 40 -50 0 50 100 150 200 tj [c] t [ns] tr tf
TLE4921-5U data sheet 21 2002-08-02 capacitor voltage versus temperature 0,00 0,50 1,00 1,50 2,00 2,50 3,00 -50 0 50 100 150 200 tj [c] vc [v] typ switching thresholds versus mechanical st @ 25 tj 0,50 0,60 0,70 0,80 0,90 1,00 012345 f [n] ? ? ? ? brp, ( ? ? ? ? bop) max min
TLE4921-5U data sheet 22 2002-08-02 filter sensitivity versus t emperature -10 -9 -8 -7 -6 -5 -4 -3 -2 -1 0 -50 0 50 100 150 200 tj [c] sc [mv/mt] typ filter input resistance versus temperature 0,6 0,7 0,8 0,9 1,0 1,1 1,2 1,3 1,4 1,5 1,6 -50 0 50 100 150 200 tj [c] rc/(rc @25c)
TLE4921-5U data sheet 23 2002-08-02 delay t ime of power on ( vs switching from 0v to 4,5v ) t pon versus temp. @ ? b = 10 mt 0,00 0,05 0,10 0,15 0,20 0,25 0,30 0,35 0,40 -50 0 50 100 150 200 t [c] k[ms/nf] min max typ periodjitter (1 ) vs. temp. magnetic field: f=1khz b p = 5mt 0,00% 0,05% 0,10% 0,15% 0,20% 0,25% 0,30% 0,35% 0,40% 0,45% 0,50% -40 -20 0 20 40 60 80 100 120 140 160 180 tj [c] jitter [%] TLE4921-5U
TLE4921-5U data sheet 24 2002-08-02 package outlines p-sso-4-1 (plastic single small outline package) 5.16 ?.08 0.2 +0.1 1 -0.1 0.25 0.4 +0.05 3.81 0.6 max. 1 max. 14 ?.05 4 ?.3 ?.4 6.35 ?.3 12.7 ? 12.7 38 max. -0.5 +0.75 9 ?.5 23.8 -1 1 ?.5 6 adhesive tape tape 0.25 -0.15 ?.1 0.5 ?.5 18 3.71 ?.08 1x45? 0.15 max. 1.9 max. 1.27 0.2 (0.25) 3.38 ?.06 5.38 ?.05 p-sso-4-1 : 0.3 d : distance chip to upper side of ic mm 0.08 aea02712 hall-probe branded side d sorts of packing package outlines for tubes, trays etc. are contained in our data book ?package information?. dimensions in mm gpo05357

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