Product Brief Applications TLE 4941plusC Differential Hall IC for Wheel Speed Sensing Reliable Wheel Speed Sensing in automotive applications Anti-lock Braking System (ABS) Electronic Stability Program (ESP) Automatic Transmissions TLE 4941plusC, a differential Hall sensor for measuring magnetically the cars wheel speed, is the latest offspring of the extremely successful TLE 4941 family, based on Infineon's most recent sensor technologies for front- and backend. Designed as drop-in replacement the TLE 4941plusC is, as its predecessors, a single chip solution combining Hall sensor elements and both analogue and digital signal processing in one single chip. Its differential principle makes it immune to any kind of undesired magnetic fields and disturbances. The Hall element distance has been downsized to 2 mm to be also fit for extremely small encoders. Several product improvements, both electrical and magnetic, have been put in place, such as an accelerated calibration during start-up phase and higher load dump robustness. The formerly optional first-edge-detection, a feature for quick start-up, providing a reliable output signal even before calibration is fully completed, has now become standard. TLE 4941plusC has a standard 2-wire current interface, high ESD robustness and works in the wide temperature range present in the harsh automotive environment. Magnetic and device offsets are cancelled by a sophisticated selfcalibration algorithm immediately after start-up. The TLE 4941plusC is an extremely robust product due to Infineon's high quality standards as experienced automotive semiconductor supplier. After several hundred million units sold, Infineon's active wheel speed sensors have largely proven to be the perfect match for wheel speed sensing in all aspects of functionality, robustness and flexibility. www.infineon.com/sensors Features Two-wire current interface: Minimizes wiring Dynamic self-calibration principle: Compensates offsets Single chip solution: Ensures outstanding reliability High sensitivity: Can be used for large airgap applications South and north pole pre-induction possible: Works for both encoders and tonewheels High resistance to piezo effects: Suits sensor overmolding wide operating temperature range C type with 1.8 nF overmolded capacitor: Enhances EMC & microbreak resistance, without any external components Product Brief TLE 4941plusC Differential Hall IC for Wheel Speed Sensing TLE 4941plusC block diagram The TLE4941plusC signal path includes a pair of hall probes (2 mm spacing), a differential amplifier and a comparator feeding a switched current output stage. Additionally, the circuit has a feedback loop for offset compensation which consists of a signal-Speed ADC, a digital signal processor (DSP) and an offset D/A converter. Parameter value Unit Operating Voltage 4.5...24 V Supply current (L/H) 7 / 14 mA Min magn. Flux density 0.7 mT Frequency range 1 ... 10000 Hz Temperaure range - 40... +150 C Jitter 2 % Calibrated Mode available >4 # of edges Type Sales Code Package TLE4941plusC SP000478508 PG-SSO-2-53 TLE4941plusCN tbd Leads with NiNiP plating TLE4941plusCB Available - 2012 With integrated back bias magnet Published by Infineon Technologies AG 85579 Neubiberg, Germany (c) 2010 Infineon Technologies AG. All Rights Reserved. Visit us: www.infineon.com Order Number: B142-H9533-X-X-7600 Date: 10 / 2010 Attention please! The information given in this document 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). 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.