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differential two-wire hall effect sensor ic TLE4941 TLE4941c features two-wire current interface dynamic self-calibration principle single chip solution no external components needed high sensitivity south and north pole pre-induction possible high resistance to piezo effects large operating air-gaps psso2-1 wide operating temperature range tle 4941c: 1.8nf overmolded capacitor type marking ordering code package tle 4941 4100e q62705-k427 psso2-1 tle 4941c 41c0e q62705-k439 psso2-2 the hall effect sensor ic TLE4941 is designed to provide information about rotational speed to modern vehicle dynamics control systems and abs. the output has been designed as a two wire current interface. the sensor operates without external components and combines a fast power-up time with a low cut-off frequency. excellent accuracy and sensitivity is specified for harsh automotive requirements as a wide temperature range , high esd and emc robustness. state-of- the art bicmos technology is used for monolithic integration of the active sensor areas and the signal conditioning circuitry. finally, the optimised piezo compensation and the integrated dynamic offset compensation enable easy manufacturing and elimination of magnet offsets. the TLE4941c is additionally provided with an overmolded 1.8nf capacitor for improved emi performance.
TLE4941, TLE4941c TLE4941 - tle 4941c data sheet febrary 2002 2 functional description the differential hall sensor ic detects the motion of ferromagnetic and permanent magnet structures by measuring the differential flux density of the magnetic field. to detect the motion of ferromagnetic objects the magnetic field must be provided by a back biasing permanent magnet. either south or north pole of the magnet can be attached to the rear unmarked side of the ic package. magnetic offsets of up to +/- 20mt and device offsets are cancelled by a self- calibration algorithm. only a few transitions are necessary for self-calibration. after the initial calibration sequence switching occurs when the input signal is crossing the arithmetic mean of its max and min value. (e.g. zero-crossing for sinusoidal si g nals) the on and off state of the ic are indicated by high and low current consumption. circuit description the circuit is supplied internally by a 3v voltage regulator. an on-chip oscillator serves as clock gener a tor for the digital part of the circuit. TLE4941 signal path is comprised of a pair of hall probes, spaced at 2.5mm, a differential amplifier i n cluding a noise-limiting low-pass filter and a comparator feeding a switched current output stage. in add i tion an offset cancellation feedback loop is provided by a signal-tracking a/d converter, a digital signal processor (dsp) and an offset cancellation d/a co n verter. during the startup phase ( un-calibrated mode) the output is disabled ( i=i low ). the differential input signal is digitized in the speed a/d converter and fed into the dsp. the minimum and maximum values of the input signal are extracted and their corresponding arithmetic mean value is calculated. the offset of this mean value is determined and fed into the offset cancellation dac. after successful correction of the offset, the output switching is enabled . in running mode (calibrated mode) the offset correction algorithm of the dsp is switched into a low-jitter mode, avoiding oscillation of the offset dac lsb. switching occurs at zero-crossing. it is only affected by the (small) remaining offset of the comparator and by the remaining propagation delay time of the signal path, mainly determined by the noise-limiting filter. signals below a defined threshold d b limit are not d e tected to avoid unwanted parasitic switc h ing.
TLE4941, TLE4941c TLE4941 - tle 4941c data sheet febrary 2002 3 pin configuration (view on branded side of component) figure 1 pga offset dac main comp digital gain range power supply regulator oscillator "vcc" - - hall probes speed adc circuit (syst clock) "gnd" figure 2 block diagram s 0015 4942 date code marking gnd v cc s 0015 4100e 2.5 v cc gnd 1.44 2.67
TLE4941, TLE4941c TLE4941 - tle 4941c data sheet febrary 2002 4 absolute maximum ratings t j = -40 to 150c, 4.5v v cc 16.5v limit values unit remarks parameter symbol min max supply voltage v cc -0.3 t j < 80c supply voltage v cc 16.5 v t j = 170c supply voltage v cc 20 v t j = 150c supply voltage v cc 22 v t = 10 * 5 min supply voltage v cc 24 v t = 10 * 5 min, r m 75 w supply voltage v cc 27 v t = 400 ms, r m 75 w reverse polarity current i rev 200 ma external current limit a tion required, t < 4h junction temperature junction temperature junction temperature junction temperature t j t j t j t j 150 160 170 190 c c c c 5000 h, v cc < 16.5v 2500 h, v cc < 16.5v 500 h, v cc < 16.5v 4 h, v cc < 16.5v active lifetime t b,active 10000 h storage temperature t s -40 150 c thermal resistance psso2-1 r thja 190 k/w 1) esd u esd 2 kv according to standard eia/jesd22-a114-b hbm 2) r=1500 w , c=100pf 1) can be improved significantly by further processing like overmolding 2) covers mil std 883d note: stresses in excess of those listed here may cause permanent damage to the device. exposure to absolute maximum rating conditions for extended periods may affect device reliability.
TLE4941, TLE4941c TLE4941 - tle 4941c data sheet febrary 2002 5 operating range limit values unit remarks parameter symbol min max supply voltage v cc 4.5 20 v supply voltage ripple v ac 6 v pp v cc =13v 0 < f < 50khz junction temperature t j -40 150 c junction temperature t j 170 c v cc 16.5v, increased jitter permissible pre-induction b 0 -500 +500 mt pre-induction offset between outer probes d b stat ., l/r -20 +20 mt differential induction d b -120 +120 mt note: within the operating range the functions given in the circuit description are fulfilled.
TLE4941, TLE4941c TLE4941 - tle 4941c data sheet febrary 2002 6 ac/dc characteristics all values specified at constant amplitude and offset of input signal limit values unit parameter symbol min typ max remarks supply current i low 5.9 7 8.4 ma supply current i high 11.8 14 16.8 ma supply current ratio i high / i low 1.9 output rise/fall slew rate tle 4941 t r , t f 12 7.5 26 24 ma/ m s r m 150 w r m 750 w see figure 4. output rise/fall slew rate TLE4941c t r , t f 8 8 22 26 ma/ m s r m = 75 w t < 125c t < 170c see figure 4. current ripple di x / dv cc i x 90 a/v limit threshold d b limit 0.35 0.8 1.5 mt initial calibration delay time t d,input 300 s additional to n start magnetic edges required for initial calibration 1) n start 3 6 * magn. edges frequency f 1 2500 hz frequency changes df/ dt 100 hz/ms duty cycle duty 40 50 60 % 2) measured @ d b = 2mt sine wave def. figure 4 jitter, t j < 150c t j < 170c s jit -close 2 3 % % 1 s value v cc = 12 v ?b 3 2mt jitter, t j < 150c t j < 170c s ji t -far 4 6 % % 1 s value v cc = 12 v (2mt 3 ) d b > d b limit jitter at board net ripple s jit -ac 2 % v cc =13v6v pp 0 < f < 50khz d b = 15 mt * see appendix b 1) the sensor requires up to n start magnetic switching edges for valid speed information after power-up or after a stand still condition. during that phase the output is disabled. 2) during fast offset alterations, due to the calibration algorithm, exceeding the specified duty cycle is permitted for short time periods.
TLE4941, TLE4941c TLE4941 - tle 4941c data sheet febrary 2002 7 output description under ideal conditions, the output shows a duty cycle of 50 %. under real conditions, the duty cycle is determined by the mechanical dimensions of the target wheel and its tolerances. (40% to 60% might be exceeded for pitch >> 5mm due to the zero- crossing principle.) speed signal sensor internal transferred speed signal figure 3 speed signal (half a period = 0.5 * 1/f speed ) t1 t tr tf i i high i low t 90% 50% 10% figure 4 definition of rise and fall time, duty = t1/t * 100%
TLE4941, TLE4941c TLE4941 - tle 4941c data sheet febrary 2002 8 electro magnetic compatibility - (values depend on r m !) ref. iso 7637-1; test circuit 1; d b = 2mt (amplitude of sinus signal); v cc =13.5 v, f b = 100 hz; t= 25c; r m 3 75 w no. parameter symbol level/ typ. status 1.1.1 testpulse 1 testpulse 2 testpulse 3a testpulse 3b testpulse 4 testpulse 5 v ld iv / -100 v iv / 100 v iv / -150 v iv / +100 v iv / -7 v iv / +86,5 v (2) c (1) c (1) a a b (3) c (1) according to 7637-1 the supply switched ?off? for t=200ms. for battery ?on? is valid status ?a?. (2) applying in the board net a suppressor diode with sufficient energy absorption capability. (3) according to 7637-1 for test pulse 4 the test voltage shall be 12v 0,2v values are valid for all TLE4941/42 types! ref. iso 7637-3; test circuit 1; d b = 2mt (amplitude of sinus signal); v cc =13.5 v, f b = 100 hz; t= 25c; r m 3 75 w no. parameter symbol level/ typ. status 1.2.1 testpulse 1 testpulse 2 testpulse 3a testpulse 3b v ld iv / -30 v iv / 30 v iv / -60 v iv / 40 v a a a a values are valid for all TLE4941/42 types! ref. iso 11452-3; test circuit 1; measured in tem-cell d b = 2mt; v cc =13.5v, f b = 100 hz; t= 25c no. parameter symbol level/max. remarks 1.2.2 emc field strength e tem-cell iv / 200 v/m am=80%, f=1khz; only valid for non c- types! ref. iso 11452-3; test circuit 1; measured in tem-cell d b = 2mt; v cc =13.5v, f b = 100 hz; t= 25c no. parameter symbol level/max. remarks 1.2.2 emc field strength e tem-cell iv / 250 v/m am=80%, f=1khz; only valid for c-types!
TLE4941, TLE4941c TLE4941 - tle 4941c data sheet febrary 2002 9 figure 5 test circuit 1 v emc d 1 d 2 c 1 r m c 2 v cc gnd components: d1: 1n4007 d2: t 5z27 1j c1: 10 f/35v c2: 1nf/1000v rm: 75 w /5w emc- generator mainfra me sensor
TLE4941, TLE4941c TLE4941 - tle 4941c data sheet febrary 2002 10 package outlines psso2-1 ( plastic single small outline package)
TLE4941, TLE4941c TLE4941 - tle 4941c data sheet febrary 2002 11 psso2-2 (plastic single small outline package)

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