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data sheet, v 1.0, july 2008 tle4998p3 TLE4998P4 programmable linear hall sensor sensors never stop thinking.
edition 2008-07 published by infineon technologies ag, am campeon 1-12, 85579 neubiberg, germany ? infineon technologies ag 2008. all rights reserved. attention please! the information herein is given to describe certain components and shall not be considered as a guarantee of characteristics. terms of delivery and rights to technical change reserved. we hereby disclaim any and all warranties, including but not limited to warranties of non-infringement, regarding circuits, descriptions and charts stated herein. information for further information on technology, delivery terms and conditions and prices please contact your nearest infineon technologies office ( www.infineon.com ). warnings due to technical requirements components may contain dangerous substances. for information on the types in question please contact your nearest infineon technologies office. infineon technologies components may only be used in lif e-support devices or systems with the express written approval of infineon technologies, if a failure of such components can reasonably be expected to cause the failure of that life-support device or system, or to affect the safe ty or effectiveness of that device or system. life support devices or systems are intended to be implanted in the human body, or to support and/or maintain and sustain and/or protect human life. if they fail, it is reasonable to assume that the health of the user or other persons may be endangered.
template: mc_a5_ds_tmplt.fm / 4 / 2004-09-15 tle4998p3 TLE4998P4 revision history: 2008-07 v 1.0 previous version: we listen to your comments any information within this do cument that you feel is wron g, unclear or missing at all? your feedback will help us to continuously improve the quality of this document. please send your proposal (including a reference to th is document) to: sensors@infineon.com
tle4998p data sheet 4 v 1.0, 2008-07 1 overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 1.1 features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 1.2 target applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 1.3 pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 2 general . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 2.1 block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 2.2 functional description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 2.3 principle of operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 2.4 transfer functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 3 maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 4 operating range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 5 electrical, thermal and magnetic parameters . . . . . . . . . . . . . . . . . . . 13 calculation of the junction tem perature . . . . . . . . . . . . . . . . . . . . . . 14 magnetic parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 6 signal processing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 magnetic field path . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 temperature compensation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 6.1 magnetic field ranges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 6.2 gain setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 6.3 offset setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 6.4 dsp input low pass filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 6.5 clamping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 6.6 pwm output fequency setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 7 error detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 7.1 voltages outside the operating range . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 7.2 eeprom error correction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 8 temperature compensation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 8.1 parameter calculation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 9 calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 9.1 calibration data memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 9.2 programming interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 9.3 data transfer protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 9.4 programming of sensors with common supply lines . . . . . . . . . . . . . . . . . 29 10 application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 11 package outlines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
programmable linear hall sensor data sheet 5 v 1.0, 2008-07 tle4998p3 TLE4998P4 pg-sso-3-10 type marking ordering code package tle4998p3 4998p3 sp412104 pg-sso-3-10 TLE4998P4 4998p4 sp412106 pg-sso-4-1 1 overview 1.1 features ? pwm open-drain output signal ? 20-bit digital signal processing ? digital temperature compensation ? 12-bit overall resolution ? operates within automotive temperature range ? low drift of output signal over temperature and lifetime ? programmable parameters stored in eeprom with single bit error correction: ? pwm output frequency ? magnetic range and magnetic sensitivity (gain), polarity of the output slope ? offset ? bandwidth ? clamping levels ? customer temperature co mpensation coefficients ? memory lock ? re-programmable unt il memory lock ? single supply voltage 4.5 - 5.5 v (4.1 - 16 v in extended range) ? operation between -200 mt and +200 mt within three ranges ? reverse-polarity and overvolt age protection for all pins ? output short-circuit protection ? on-board diagnostics (o vervoltage, eeprom error) ? digital readout of the magn etic field and internal temp erature in calibration mode ? programming and operation of multiple sensors wi th common power supply ? two-point calibration of magnetic transfer functi on without iteration steps ? high immunity against me chanical stress, emc, esd
tle4998p overview data sheet 6 v 1.0, 2008-07 1.2 target applications ? robust replacement of potentiometers ? no mechanical abrasion ? resistant to humidity, temper ature, pollution and vibration ? linear and angular position sensing in automotive app lications such as pedal position, suspension control, valv e or throttle position, headlight levelling, and steering angle ? high-current sensing for ba ttery management, motor contro l, and electronic fuses 1.3 pin configuration figure 1 and figure 2 show the location of the hall el ement in the chip and the distance between the hall probe and surface of the package. figure 1 tle4998p3 pin configurat ion and hall cell location table 1 tle4998p3 pin defini tions and functions pin no. symbol function 1 vdd supply voltage / pr ogramming interface 2 gnd ground 3 out output / programming interface 1 center of hall probe 23 aep0371 7 0.38 ?.05 2.03 ?.1 1.625 ?.1 hall-probe branded sid e
tle4998p overview data sheet 7 v 1.0, 2008-07 figure 2 TLE4998P4 pin configurat ion and hall cell location table 2 TLE4998P4 pin defini tions and functions pin no. symbol function 1 tst test pin (connection to gnd is recommended) 2 vdd supply voltage / pr ogramming interface 3 gnd ground 4 out output / programming interface aep0365 4 pg-sso-4-1: 0.3 d : distance chip to branded side of ic mm ?.08 hall-probe branded side d 2 3 4 1 center of sensitive area 2.67 1.53 b b a 0.2 a 0.2
tle4998p general data sheet 8 v 1.0, 2008-07 2 general 2.1 block diagram figure 3 is a simplified block diagram. figure 3 block diagram 2.2 functional description the linear hall ic tle4 998p has been de signed specifically to meet the requirements of highly accurate rotation and position detection, as we ll as for curr ent measurement applications. the sensor provides a digital pwm signal, which is ideally suited for direct decoding by any unit measuring a duty cycle of a rectangular sig nal (usually a timer/ capture unit in a microcontroller). furthermore, it is possible to a ttach an external lo wpass filter, which allows an a/d conversion using the sensor supply voltage as a reference. the output stage is an open-drain driver pulli ng the output pad to low only. therefore, the high level must be obtained by an external pull-up resistor. this output type has the advantage that the receiver ma y use even a lower supply vo ltage (e.g. 3.3 v). in this case, the pull-up resistor must be co nnected to the given receiver supply. spinning hall bias a d dsp a d temp. sense rom eeprom interface out vdd gnd supply pwm tst *) tle4998 p4 only *)
tle4998p general data sheet 9 v 1.0, 2008-07 the ic is produced in bicmos technology with high voltag e capability, also providing reverse polarity protection. digital signal processing, using a 16-bit dsp architectu re together with digital temperature compensation, guar antees excellent long-time stability as compared to analog compensa tion methods. while the overall resolution is 16 bits, some intern al stages work with resolutions up to 20 bits. the pwm output frequency can be selected wi thin the range of 12 2 hz up to 1953 hz. 2.3 principle of operation ? a magnetic flux is meas ured by a hall -effect cell ? the output signal from the hall-effect cell is converted from analog to digital signals ? the chopped hall -effect cell and continuous-time a/ d conversion ensure a very low and stable ma gnetic offset ? a programmable low-pass filter reduces the noise ? the temperature is measur ed and a/d converted, too ? temperature compensation is done digitally using a second order function ? digital processing of out put value is based on zero field and sensitivity value ? the output value range can be clamped by digital limiters ? the final output value is transferred in a rectangular, pe riodic signal with varying duty cycle (pulse width modulation) ? the duty cycle is proportiona l to the 12-bit output value
tle4998p general data sheet 10 v 1.0, 2008-07 2.4 transfer functions the examples in figure 4 show how different magnetic field ranges can be mapped to the desired output value ranges. ? polarity mode: ? bipolar : magnetic fields can be measured in both orientations. the limit points do not necessarily have to be symme trical around the zero field point ? unipolar : only north- or south-oriented magnetic fields are measured ? inversion: the gain values can be set po sitive or negative. figure 4 examples of operation 0 100 50 -5 0 100 100 -100 100 200 -200 duty (% ) v out v out 00 b (mt) duty (%) b (mt) duty (%) b (mt) 0 0 0 example 1: - bipolar example 2: - unipolar -big offset example 3: - bipolar - inverted (neg. gain)
tle4998p maximum ratings data sheet 11 v 1.0, 2008-07 3 maximum ratings note: stresses above those listed under ?absolute maximum ratings? may cause permanent damage to t he device. this is a stress rating on ly and functional operation of the device at these or any other conditions above those indicated in the operational sectio ns of this specific ation is not implied. exposure to absolute maxi mum rating conditions for ex tended periods may affect device reliability. table 3 absolute maximum ratings parameter symbol limit values unit notes min. max. storage temperature t st - 40 150 c junction temperature t j - 40 170 1) 1) for limited time of 96 h. depends on customer temperature lifetime cycles. please ask infineon for support c voltage on v dd pin with respect to ground v dd -18 18 v 2) 2) higher voltage stress than absolute maximum rating, e.g. 150% in latch-up tests is not applicable. in such cases, r series 100 ? for current limitation is required supply current @ overvoltage v dd max. i ddov - 15 ma reverse supply current @ v dd min. i ddrev -1 - ma voltage on output pin with respect to ground out -1 3) 3) i dd can exceed 10 ma when the voltage on out is pulled below -1 v (-5 v at room temperature) 18 4) 4) v dd = 5 v, open drain permanent low, for max. 10 min v magnetic field b max - unlimited t esd protection v esd - 4.0 kv according hbm jesd22-a114-b 5) 5) 100 pf and 1.5 k ?
tle4998p operating range data sheet 12 v 1.0, 2008-07 4 operating range the following operating conditions must not be exceed ed in order to ensure correct operation of the tle4998p. all parameters sp ecified in the followi ng sections refer to these operating condi tions, unless otherwise indicated. table 4 operating range parameter symbol limit values unit notes min. max. supply voltage v dd 4.5 5.5 v 4.1 1) 1) for reduced output accuracy 16 2) 2) for supply voltages > 12v, a series resistance r series 100 ? is recommended v extended range output pull-up voltage 3) 3) required output protocol characteristics depend on these parameters, r l must be according to max. output current out - 18 v load resistance 3) r l 1 - k ? output current 3) i out 0 5 ma load capacitance 3) c l 1 8 nf junction temperature t j - 40 125 150 4) 4) for reduced magnetic accuracy; extended limits are taken for characteristics note: keeping signal le vels within the limits specified in this ta ble ensures operation without overload conditions. c for 5000 h for 1000 h not additive
tle4998p electrical, thermal and magnetic parameters data sheet 13 v 1.0, 2008-07 5 electrical, thermal and magnetic parameters table 5 electrical characteristics parameter symbol limit values unit notes min. typ. max. pwm output frequency f pwm 122 - 1953 hz programmable 1) 1) internal rc oscillator variation +/- 20% output duty cycle range dy pwm 0 - 100 % programmable supply current i dd 3 6 8 ma output current @ out shorted to supply lines i outsh - 95 - ma v out = 5v, max. 10 minutes thermal resistance tle4998p3 r thja - 219 - k/w junction to air r thjc - 47 - k/w junction to case thermal resistance TLE4998P4 r thja - 240 - k/w junction to air r thjc - 41 - k/w junction to case power-on time 2) 2) response time to set up output duty cycle at power-on when a constant field is applied (f pwm =1953hz). the first value given has a 5% error, the second value has a 1% error t pon - 0.7 15 2 20 ms ? dy pwm 5% ? dy pwm 1% power-on reset level v ddpon - 3.6 4 v output impedance z out 19 30 44 k ? 3) 3) vdd = 5v, open-drain high state, voltage on out pin typ. 84% of vdd output fall time t fall 2 - 4 s v out 4.5 v to 0.5 v 4) 4) for v dd = 5 v, r l = 2.2 k ? , c l =4.7 nf output rise time t rise - 20 - s v out 0.5 v to 4.5 v 4) 5) 5) depends on external r l and c l output low saturation voltage v outsat - 0.3 0.2 0.6 0.4 v i outsink = 5 ma i outsink = 2.2 ma output noise (rms) out noise - 1 2.5 lsb 12 6) 6) range 100 mt, gain 2.23, internal lp filter 244 hz, b = 0mt, t = 25c v out *) v dd 90% v dd 10% v dd t rise t t fall *) r l to v dd assumed t low t pwm dy = t high /t pwm v outsat t high
tle4998p electrical, thermal and magnetic parameters data sheet 14 v 1.0, 2008-07 calculation of the junction temperature the total power dissipation p tot of the chip incr eases its temperatur e above th e ambient temperature. the power multipli ed by the total t hermal resistance r thja (junction to ambient) leads to the final juncti on temperature. r thja is the sum of the addition of the values of the two components junction to case and case to ambient . r thja = r thjc + r thca t j = t a + ? t ? t = r thja x p tot = r thja x ( v dd x i dd + v out x i out ) i dd , i out > 0, if direction is into ic example TLE4998P4 (ass uming no load on vout): ? v dd = 5 v ? i dd = 8 ma ? ? t = 240 [k/w] x (5 [v] x 0. 008 [a] + 0 [va] ) = 9.6 k for moulded sensors, th e calculation with r thjc is more adequate. magnetic parameters table 6 magnetic characteristics parameter symbol limit values unit notes min. typ. max. sensitivity s 1) 1) defined as ? dy pwm / ? b 0.2 - 6 %/mt 2)3) 2) programmable in steps of 0.024% 3) @ v dd = 5v and t j = 25c temperature coefficient of sensitivity tc -150 0 150 ppm/ c 4) see figure 5 4) for any 1 st and 2 nd order polynomial, coefficient within definition in chapter 8 magnetic field range mfr 50 100 5) 200 mt programmable 6) integral nonlinearity inl - 0.1 - 0.1 %mfr 7)9) magnetic offset b os - 400 0 400 t 8)9) magnetic offset drift ? b os - 5 - 5 t / c error band 9) magnetic hysteresis b hys 0 - 10 t 10)
tle4998p electrical, thermal and magnetic parameters data sheet 15 v 1.0, 2008-07 figure 5 drift of temperature coefficient 5) this range is also used for temperatur e and offset pre-calibration of the ic 6) depending on offset and gain settings, the out put may already be saturated at lower fields 7) gain setup is 1.0 8) in operating temperature range and over lifetime 9) measured at 100 mt range 10) measured in 100 mt range, gain = 1, room temperature ? s ~ s(t)/s 0 -1 t j ? s 0 max. pos. tc-error tc max = ? s/ ? t max. neg. tc-error tc min = ? s/ ? t t 0 t min t max 0
tle4998p signal processing data sheet 16 v 1.0, 2008-07 6 signal processing the flow diagram in figure 6 shows the data-pro cessing algorithm. figure 6 signal processing flow magnetic field path ? the analog output signal of the chopped hall-effect cell is converted to a digital signal in the continuous-tim e a/d converter. the range of t he chopped a/d co nverter can be set in several steps (see table 7 ). this gives a suitable level for the a/d converter ? after the a /d conversion, a digita l-low pass filter reduc es the band width ( table 11 ). ? a multiplier amplif ies the value dependin g on the gain (see table 9 ) and temperature compensation settings ? the offset val ue is added (see table 10 ) ? a limiter reduces the resulting signal to 12 bits and feeds the pr otocol generation stage temperature compensation (details are given in chapter 8 ) ? the output signal of the temper ature cell is also a/d converted ? the temperature is normalized by subt raction of the refe rence temperature t 0 value (zero point of the quadratic function) stored in eeprom memory + x a d hall sensor limiter (clamp) out x range lp offset gain a d + -t 0 tc 1 temperature compensation 1 + x tc 2 x x protocol generation temperature sensor
tle4998p signal processing data sheet 17 v 1.0, 2008-07 ? the linear path is multiplied by the tc 1 value ? in the quadratic pa th, the temperature difference to t 0 is squared and mu ltiplied by the tc 2 value ? both path outputs are added together and multiplied by the gain value from the eeprom 6.1 magnetic field ranges the working range of the magnet ic field defines the input range of the a/d converter. it is always symmetrical around the zero field point. any two points in the magnetic field range can be sele cted to be the end points of the output value. the output value is represented wihtin the ra nge between the two points. in the case of fields higher than the range values , the output signal may be distorted. the range must be set before th e calibration of offset and gain. table 7 range setting range range in mt 1) 1) ranges do not have a guaranteed absolute accuracy. the temperature pre-calibration is performed in the mid range (100 mt). setting r = 2 is not used, internally changed to r = 1 parameter r low 50 3 mid 100 1 high 200 0 table 8 range parameter symbol limit values unit notes min. max. register size r 2 bit
tle4998p signal processing data sheet 18 v 1.0, 2008-07 6.2 gain setting the sensitivity is defi ned by the range and the gain setting. the output of the a/d converter is multiplied by the gain value. the gain va lue can be calculated by : 6.3 offset setting the offset value corre sponds to an output value with zero field at the sensor. the offset value c an be calculated by: table 9gain parameter symbol limit values unit notes min. max. register size g 15 bit unsigned integer value gain range gain - 4.0 3.9998 - 1)2) 1) for gain values between - 0.5 and + 0.5, the numerical accuracy decreases. to obtain a flatter output curve, a higher range setting should be selected 2) a gain value of +1.0 corresponds to typical 0.8%/mt sens itivity (100 mt range, not guaranteed). it is crucial to do a final calibration of each ic within the application using the gain/dy os value gain quantization steps ? gain 244.14 ppm corresponds to 1 / 4096 table 10 offset parameter symbol limit values unit notes min. max. register size os 15 bit unsigned integer value offset range dy os -400 399 % virtual dy pwm 1) 1) infineon pre-calibrates the samples at zero field to 50% duty cycle (100 mt range), but does not guarantee the value. therefore it is crucial to do a final calibration of each ic within the application offset quantization steps ? dy os 0.024 % 100% / 4096 gain g 16384 ? () 4096 --------------- -------------- - = dy os os 16384 ? () 4096 ----------- ------------ ---------- 100 =
tle4998p signal processing data sheet 19 v 1.0, 2008-07 6.4 dsp input low pass filter a digital low-pass filter is placed between the hall a/d co nverter and the dsp an can be to reduce the noise leve l. the low-pass filter has a constant dc am plification of 0 db (gain of 1), which means that its setting ha s no influence on the internal hall a/d converter value. the bandwidth can be set in 8 steps. note: in range 7 (filter off), the output noise increases. table 11 low-pass filter setting note: parameter lp cutoff frequency in hz (at -3 db point) 1) 1) as this is a digital filter running with an rc-based oscillator, the cutoff frequency may vary within 20% 0 80 1 240 2 440 3 640 4 860 5 1100 6 1390 7 off table 12 low-pass filter parameter symbol limit values unit notes min. max. register size lp 3 bit corner frequency variation ? f - 20 + 20 %
tle4998p signal processing data sheet 20 v 1.0, 2008-07 figure 7 shows the filter characteri stics as a magnitude plot (h ighest setting is marked). the ?off? position would be a flat 0 db line. t he update rate after the low-pass filter is 16 khz. figure 7 dsp input filter (magnitude plot) 10 1 10 2 10 3 0 -6 -5 -4 -3 -2 -1 magnitude (db) frequency (hz)
tle4998p signal processing data sheet 21 v 1.0, 2008-07 6.5 clamping the clamping function is useful for splitting the output voltage range into operating range and error ranges. if th e magnetic field is out side the selected meas urement range, the output value out is limited to the clamping values. the clamping values are calculated by: clamping duty cycle low (d eactivated if cl=0): clamping duty cycle high (deactivated if ch=127): table 13 clamping parameter symbol limit values unit notes min. max. register size cl,ch 2 x 7 bit clamping duty cy. low cy clpwm 0 100 % 1) 1) for cl = 0 and ch = 127 the clamping function is disabled clamping duty cy. high cy chpwm 0 100 % 1) 2) 2) cy clpwm < cy chpwm mandatory clamping quantization steps ? cy cxpwm 0.78 % 3) 3) quantization starts for cl at 0% and for ch at 100% cy clpwm cl 32 ? 4096 ------------------ = cy chpwm ch 1 + () 32 1 ? ? 4096 -------------- -------------- ----------- - =
tle4998p signal processing data sheet 22 v 1.0, 2008-07 figure 8 shows an example in which the magnetic field range between b min and b max is mapped to duty cycl es between 16% and 84%. figure 8 clamping example note: the clamping high value must be above the low value. if cy clpwm is set to a higher value than cy chpwm , the cy chpwm value is dominating. this would lead to a constant output du ty cycle independent of the magnetic field strength. 0 20 b min b (mt) b max dy pwm (%) 100 40 80 60 error range error range operating range dy chpwm dy clpwm
tle4998p signal processing data sheet 23 v 1.0, 2008-07 6.6 pwm output fequency setup this enables a setup of different pwm output frequenci es, even if the internal rc oscillator varies by 20%. table 14 predivider setting the nominal unit time is calculated by: parameter symbol limit values unit notes min. max. register size prediv 4 bit predivider pwm output frequency f pwm 122 1953 hz osc clk =1953 hz f pwm = osc clk / ( prediv + 1) osc clk = 1953 hz 20%
tle4998p error detection data sheet 24 v 1.0, 2008-07 7 error detection different error cases can be detected by the on-board-dia gnostics (obd ) and reported to the microcontroller. the obd is useful only when the clamping function is enabled. 7.1 voltages outside the operating range the output signals er ror conditions if v dd crosses the overvolt age threshold level. table 15 overvoltage 7.2 eeprom error correction the parity method is ab le to correct one singl e bit in one eeprom li ne. one other single- bit error in another line can also be detected. as this situation is not correctable, this status is signalled at the output pin by clamping the output value to cy pwm = 100% . table 16 eeprom error signalling parameter symbol limit values unit notes min. typ. max. overvoltage threshold v ddov 16.65 17.5 18.35 v output duty cycle @ overvoltage cy pwmov 100 1) 1) output stays in ?off? state (high ohmic) - - % parameter symbol limit values unit notes min. max. output duty cycle @ eeprom error cy pwmerr 100 1) 1) output stays in ?off? state (high ohmic) %
tle4998p temperature compensation data sheet 25 v 1.0, 2008-07 8 temperature compensation the magnetic field strength of a magnet de pends on the temperature. this material constant is specific to different magnet ty pes. therefore, the tl e4998p offe rs a second- order temperature compensation polynomial, by which the hall signal ou tput is multiplied in the dsp. there are three parameters for the compensation: ? reference temperature t 0 ? a linear part (1 st order) tc 1 ? a quadratic part (2 nd order) tc 2 the following form ula describes the sensitivity dependen t on the temperature in relation to the sensitivity at th e reference temperature t 0 : for more information, see also the signal-processing flow in figure 6 . the full temperature compen sation of the complete syst em is done in two steps: 1. pre-calibration in th e infineon final test the parameters tc1, tc2, t0 are set to maximally flat temperature characteristics regarding the hall pro be and internal analog processing parts. 2. overall system calibration the typical coefficients tc1, tc2, t0 of the magnetic circuitry are programmed. this can be done deterministically, as the algorithm of the d sp is fully reproducible. the final setting of the tc1, tc2, t0 values depend on the pre-calibrated values. table 17 temperature compensation parameter symbol limit values unit notes min. max. register size tc 1 tl - 9 bit unsigned integer values 1 st order coefficient tc 1 tc 1 -1000 2500 ppm/ c 1) 1) full adjustable range: -2441 to +5355 ppm/c, can be only used after confirmation by infineon quantization steps of tc 1 qtc 1 15.26 ppm/ c register size tc 2 tq - 8 bit unsigned integer values 2 nd order coefficient tc 2 tc 2 - 4 4 ppm/ c2 2) 2) full adjustable range: -15 to +15 ppm/c2, can be only used after confirmation by infineon quantization steps of tc 2 qtc 2 0.119 ppm/ c2 reference temp. t 0 - 48 64 c quantization steps of t 0 qt 0 1 c 3) 3) handled by algorithm only (see application note) s tc t () 1 tc 1 tt 0 ? () tc 2 tt 0 ? () 2 ++ =
tle4998p temperature compensation data sheet 26 v 1.0, 2008-07 8.1 parameter calculation the parameters tc 1 and tc 2 may be calculated by: the digital output for a given field b in at a specific temperatur e can then be calculated by: b fsr is the full range magnetic field. it is dependent on the range setting (e.g 100 mt). s 0 is the nominal se nsitivity of the hall pr obe times the gain fact or set in the eeprom. s tc is the temperature-dependent sensitiv ity factor calculated by the dsp. s tchall is the temperature beha vior of the hall probe. the pre-calibration at infineon is performed such that the following condition is met: within the application, an additional factor b in (t) / b in (t 0 ) will be given due to the magnetic system. s tc then needs to be modified to s tcnew so that the following condition is satisfied: therefore, the new se nsitivity parameters s tcnew can be calculated from the pre- calibrated setup s tc using the relationship: tc 1 tl 160 ? 65536 ----------- ----------- 1000000 = tc 2 tq 128 ? 8388608 ------------ ----------- 1000000 = dy out 2 b in b fsr ------------ - s tc s tchall s 0 4096 ?? ?? ?? ? dy os + = s tc t j t 0 ? () s tchall t j () 1 b in t () b in t 0 () ---------- ---------- s tcnew t () s tchall t () s tc t () s tchall t () 1 ? b in t () b in t 0 () ----------- --------- s tcnew t () s tc t ()
tle4998p calibration data sheet 27 v 1.0, 2008-07 9calibration for the calibration of the sensor, a special hardware interface to a pc is required. all calibration and setting bits ca n be temporarily written into a random access memory (ram). this allows the eeprom to remain untouched during the entire calibration process, since the number of the eeprom programming cycl es is limited. therefore, this temporary setup (u sing the ram onl y) does not stress the eeprom. the digital signal processing is completely deterministi c. this allows a two-point calibration in one step without iterations. after measurin g the hall output signal for the two end points, the signal pr ocessing parameters ga in and offset can be calculated. note: depending on the app lication and external instrument ation setup, the accuracy of the two-point calibration can be improved. table 18 calibration characteristics parameter symbol limit values unit notes min. max. temperature at calibration t cal 10 30 c two-point calibration accuracy ? cy cal1 -0.2 0.2 % position 1 ? cy cal2 -0.2 0.2 % position 2
tle4998p calibration data sheet 28 v 1.0, 2008-07 9.1 calibration data memory when the memlock bits are pr ogrammed (two redundant bits ), the memory content is frozen and may no longer be changed. furthe rmore, the programming interface is locked out and the chip remains in the applicat ion mode only. this prevents accidental programming due to envi ronmental influences. figure 9 eeprom map a matrix parity architecture allows automatic correction of any single -bit error. each row is protected by a row parity bit. the sum of bits set including th is bit must be an odd number (odd parity). each colu mn is additionally protected by a column parity bit. each bit in the even position s (0, 2, etc.) of all lines mu st sum up to an even number (even parity), and each bit in the odd positions (1,3, et c.) must have an odd sum (odd parity). the parity column must have an even sum (even parity). this mechanism of different parity calculat ions also protects agai nst many block errors such as erasing a full line or even the whole eeprom. when modifying the application bits (such as gain, offset, tc, etc.) the parity bits must be updated. as for the column bits, the pr e-calibration area mu st be read out and considered for correct pari ty generation as well. note: a specific programming algorithm must be followed to ensure data retention. a detailed separate pr ogramming specification is available on request. user-calibration bits pre-calibration bits column parity bits row parity bits
tle4998p calibration data sheet 29 v 1.0, 2008-07 9.2 programming interface t he vdd pin and the out pin are used as a two-wire interface to transmit the eeprom data to and from the sensor. this allows ? communication with high data reliability ? the bus-type connection of several sensors and separate programming via the out pin 9.3 data transfer protocol the data transfer protocol is described in a separate document (user programming description), avai lable on request. 9.4 programming of sensors with common supply lines in many automotive applications, two sensor s are used to measure the same parameter. this redundancy allows the ope ration to continue in an em ergency mode. if both sensors use the same power supply lines, they ca n be programmed to gether in parallel. table 19 programming characteristics parameter symbol limit values unit notes min. max. number of eeprom programming cycles n prg - 10 cycles 1) 1) 1 cycle is the simultaneous change of 1 bit programming allowed only at star t of lifetime ambient temperature at programming t prg 10 30 c programming time t prg 100 - ms for complete memory 2) 2) depending on clock frequency at v dd , write pulse 10 ms 1%, erase pulse 80 ms 1% calibration memory - 150 bit all active eeprom bits error correction - 26 bit all parity eeprom bits
tle4998p application circuit data sheet 30 v 1.0, 2008-07 10 application circuit figure 10 shows the connection of multiple sensors to a microcontroller. figure 10 application circuit note: for calibration an d programming, the interface has to be connected directly to the output pin. the tst pin is not co nnected in the a pplication circuit. the application circuit show n must be regarded as only an example that will need to be adapted to meet the requirements of other specific applications. tle 4998 optional v dd cc in1 cc in2 v gnd 47nf 1 nf 2k2 4.7nf 47nf 2k2 1 nf 4.7nf c out v dd gnd tle 4998 out v dd gnd 50 50 voltage supply sensor voltage supply c vdd out1 gnd out2 sensor module ecu module
tle4998p package outlines data sheet 31 v 1.0, 2008-07 11 package outlines figure 11 pg-sso-3-10 (plastic green single small outline package) 1) no solder function area molded body dimensions do not unclude plastic or metal protrusion of 0.15 max per side ?.3 12.7 ?.4 6.35 12.7 ? total tolerance at 19 pitches ? ?.3 4 19 ?.5 9 -0.50 +0.75 33 max. (useable length) (10) ?.5 18 a ?.5 6 1 -1 -0.15 0.25 ?.1 0.39 tape adhesive tape (0.25) 1 ?.2 1) 0.1 max. 0.5 0.5 ?.05 ?.1 0.42 3x 1.5 ?.05 4.06 4.05 ?.05 2 x 1.27 = 2.54 a 2 ?.05 1.5 0.36 ?.05 0.82 ?.05 p-pg-sso-3-10-po v02 45? 5? 123 b b c 2 c
tle4998p package outlines data sheet 32 v 1.0, 2008-07 figure 12 pg-sso-4-1 (plastic green single small outline package) 1) 1 max. 0.2 (0.25) 0.1 max. 1 x 45? 1.9 max. ?? ?.08 5.16 ?.05 5.34 0.2 +0.1 7? 7? -0.1 ?.08 ?.06 3.71 3.38 0.25 ?.05 a 2 1 ?.05 0.4 0.5 4x 0.6 max. 1.27 3 x 1.27 = 3.81 total tolerance at 10 pitches ? 1 ) no solder function area ?.3 ?.4 6.35 12.7 12.7 ? ?.5 -0.5 +0.75 4 ?.3 9 gpo0535 7 -0.15 ?.1 tape adhesiv e tape 0.25 0.39 ?.5 a 18 6 (useable length) (14.8) 23.8 ?.5 38 max. -1 1 14 3 2
tle4998p package outlines data sheet 33 v 1.0, 2008-07
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