data sheet supplement, v2.1, february 2005 differential two-wire hall effect sensor-ic for wheel speed applications tle4941-1 TLE4941-1C sensors never stop thinking.
edition 2004-03-19 published by infineon technologies ag, st.-martin-strasse 53, 81669 mnchen, germany ? infineon technologies ag 2005. 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 life-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 safety 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.
pg-sso-2-1 pg-sso-2-2 data sheet supplement 3 v2.1, 2005-02 differential two-wire hall effect sensor ic tle4941-1 TLE4941-1C for all parameters not specified in this document the tle4941 data sheet is valid. type marking ordering code package tle4941-1 4101r q62705-k719 pg-sso-2-1 TLE4941-1C 41c1r q62705-k712 pg-sso-2-2
tle4941-1 TLE4941-1C data sheet supplement 4 v2.1, 2005-02 functional description figure 1 example for start-up behavior uncalibrated mode occasionally a short initial offset settling time t d,input might delay the detection of the input signal (the sensor is ?blind?). the magnetic input signal is tracked by the speed adc and monitored within the digital circuit. for detection the signal transient needs to exceed a threshold (digital noise constant d1). when the signal slope is identified as a rising edge (or falling edge), a trigger pulse is issued to a comparator. a second trigger pulse is issued as soon as a falling edge (or rising edge respectively) is detected (and vice versa). between the start-up of the magnetic input signal and the time when its second extreme is reached, the pga (programmable gain amplifier) will switch to its appropriate position. this value is determined by the signal amplitude and initial offset value. the digital noise constant value is changing accordingly (d1 d2, related to the corresponding pga states), leading to a change in phase shift between magnetic input signal and output aed03204 uncalibrated mode calibrated mode 12 3 4 5 6 7 initial setting time d1 d1 pga switching d2 d2 d2 offset corection phase shift change = peak detection offset = (max + min) / 2
tle4941-1 TLE4941-1C data sheet supplement 5 v2.1, 2005-02 signal. after that consecutive output edges should have a nominal delay of about 180. in rare cases one further switching of pga can occur (see appendix b). during the uncalibrated mode the offset value is calculated by the peak detection algorithm as described in the tle4941 data sheet. transition to calibrated mode in the calibrated mode the output will switch at zero-crossing of the input signal. the phase shift between input and output signal is no longer determined by the ratio between digital noise constant and signal amplitude. therefore a sudden change in the phase shift may occur during the transition from uncalibrated to calibrated mode. calibrated mode see tle4941 data sheet. additional notes unlike the tle4941 the first output edge might occur before the first zero-crossing of the magnetic input signal. however, referring to the input signal the delay between start-up of the signal and first calibrated output signal is identical with tle4941. typically the phase error due to pga-transition reduces the error caused by switching the mode from uncalibrated to calibrated. pga-transition usually takes place on the first full magnetic edge. the summed up change in phase error from the first output edge issued to the output edges in calibrated mode will not exceed 90. circuit description see tle4941 data sheet.
tle4941-1 TLE4941-1C data sheet supplement 6 v2.1, 2005-02 table 1 additions/changes for tle4941-1 versus tle4941 (all values are valid for constant amplitude and offset of input signal, f < 2500 hz) parameter symbol limit values unit conditions min. typ. max. signal behavior after undervoltage or standstill > t stop number of magnetic edges where the first switching may occur 1) n dz-start ? ? 1 edge magnetic edge amplitude according to ? ? b limit,early startup t d,input has to be taken into account systematic phase error of output edges during start-up and uncalibrated mode 38 ? ? s shortest time delay between input signal edge 1 and 2 t d,input has to be taken into account ? 88 ? + 88 systematical phase error of ?uncal? edge; n th vs. n + 1 th edge (does not include random phase error) phase shift change during pga switching 0 ? 80 after the 2 nd edge phase shift change during transition from uncalibrated to calibrated mode ? switch ? 90 ? + 90 number of edges in uncalibrated mode n dz-startup ? ? 6 edges in rare cases (see ?appendix b? on page 6 ) n dz-startup ? ? 8 edges jitter during uncalibrated mode 1 hz < f < 2500 hz s jitclose (1 -value) ? ? ? ? 3 4 % ? 40c t amb 150c 150c t amb 170c
tle4941-1 TLE4941-1C data sheet supplement 7 v2.1, 2005-02 behavior at magnetic input signals slower than t stop (self-calibration time period) unlike the tle4941 magnetic changes exceeding ? ? b limit, early startup can cause output switching of the tle4941-1, even at f significantly lower than 1 hz. depending on their amplitude edges slower than ? t limit, slow early startup might be detected. if the digital noise constant ( ? ? b limit, early startup ) is not exceeded before a new initial self-calibration is started, the output of the corresponding edge will be inhibited. this depends on signal amplitude and initial phase. additional remarks all additional parameters for tle4941-1 are not subject to production test - verified by design/characterization. for series production additional to the parameters of tle4941 (standard type) only n dz-start is tested. s jitfar (1 -value) ? ? ? ? 5 7 % ? 40c t amb 150c 150c t amb 170c s jitac (1 -value) ? ? 3 % see tle4941 data sheet magnetic differential field change necessary for early startup of the - 1 versions ? ? b limit, early startup ? ? ? magnetic field (peak to peak value) change necessary for startup with the first edge ? ? b limit, early startup 1 hz < f < 2500 hz 2500 hz < f < 10000 hz 0.7 ? 1.76 ? 3.3 3.9 mt permitted time for edges to exceed ? ? b limit, early startup ? t limit, slow early startup ? ? 590 ms necessary for startup with the second edge f < 1 s 1) due to defined power on state (low current) the ic can not provide the first edge if it would lead as well to a low state table 1 additions/changes for tle4941-1 versus tle4941 (all values are valid for constant amplitude and offset of input signal, f < 2500 hz) (cont?d) parameter symbol limit values unit conditions min. typ. max.
tle4941-1 TLE4941-1C data sheet supplement 8 v2.1, 2005-02 for questions on technology, delivery and prices please contact the infineon technologies offices in germany or the infineon technologies companies and representatives worldwide: see our webpage at http://www.infineon.com revision history:2005-02, v2.1 previous version: 2004-01, v2.0 page subjects (major changes since last revision) 3 package name changed from p-... to pg-... - new format of data sheet we listen to your comments any information within this document that you feel is wrong, 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 this document) to: feedback.sensors@infineon.com
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