Pr oduc t Br ief TLE4941/4941C Smar t Hall Effect ICs for Active Wheel Sp eed Sensing Applications Modern ABS systems Transmission speed sensing Features No external components needed Frequency range from 1 to 5000 Hz Two wire standard current interface Dynamic self-calibration principle Excellent sensitivity (min B < 1.5 mT) South and North pole pre-induction possible Ultra thin PG-SSO package 1.8 nF overmoulded capacitor for enhanced EMC (C-versions) Single chip solution Output switching with 1 st magnetic edge (-1 versions) Fun ctional Description T H E D I F F E R E N T I A L 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. Magnetic and device offsets are cancelled by a self-calibration algorithm whithin a few transitions. The ON and OFF state of the IC are indicated by High and Low current consumption. www.infineon.com/sensors S e ns o rs PG -SSO-2 -2 Product Brief Block Diagram VCC T L E 4 9 4 1 signal path is comprised of a pair of hall probes, spaced at 2.5 mm, a differential amplifier including a noiselimiting low-pass filter, and a comparator feeding a switched current output stage. Power Supply Regulator Main Comp Oscillator (syst clock) GND PGA Hall Probes - - Speed ADC Offset DAC Gain Range I N A D D I T I O N 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 converter. Digital Circuit Parameter Value Unit Operating voltage 4.5 ... 20 V Supply current (L/H) 7 / 14 mA Min magn. flux density < 1.5 mT Power on time <1 msec Frequency range < 1 ... 5000 Hz Temperature range -40 ... +150 C Jitter <2 % Inte r face Description TLE4941 outputs a conventional square wave signal for speed frequency. Magnetic Signal TLE4941 Type Sales Code Package TLE4941 Q62705-K714 PG-SSO-2-1 TLE4941C Q62705-K715 PG-SSO-2-2 TLE4941-1 Q62705-K719 PG-SSO-2-1 TLE4941-1C Q62705-K712 PG-SSO-2-2 How to reach us: http://www.infineon.com Published by Infineon Technologies AG 81726 Munchen, Germany (c) Infineon Technologies AG 2006. All Rights Reserved. Legal Disclaimer The information given in this Product Brief shall in no event be regarded as a guarantee of conditions or characteristics ("Beschaffenheitsgarantie"). With respect to any examples or hints given herein, any typical values stated herein and/or any information regarding the application of the device, Infineon Technologies hereby disclaims any and all warranties and liabilities of any kind, including without limitation warranties of non-infringement of intellectual property rights of any third party. Information For further information on technology, delivery terms and conditions and prices please contact your nearest Infineon Technologies Office (www.infineon.com). Published by Infineon Technologies AG 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. Ordering No. B112-H7820-G1-X-7600 Printed in Germany PS 03061. nb