Product Brief TLE4941plusC/CB Differential Hall IC for Wheel Speed Sensing Applications TLE4941plusC, a differential Hall sensor for measuring magnetically the car’s wheel speed, is the latest offspring of the extremely successful TLE4941 family, based on Infineon’s most recent sensor technologies for front-and backend. Designed as Reliable wheel speed sensing in automotive applications drop-in replacement the TLE4941plusC is, as its predecessors, a single chip solution Anti-lock Braking System (ABS) combining Hall sensor elements and both analogue and digital signal processing in Electronic Stability Program 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 (ESP) Automatic transmissions 2mm 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 Features during start-up phase and higher load dump robustness. The formerly optional first- Two-wire current interface: edge-detection, a feature for quick start-up, providing a reliable output signal even minimizes wiring before calibration is fully completed, has now become standard. Dynamic self-calibration TLE4941plusC has a standard 2-wire current interface, high ESD robustness and Single chip solution: ensures principle: compensates offsets 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. outstanding reliability High sensitivity: can be used for large airgap applications South and north pole pre- The TLE4941plusC is an extremely robust product due to Infineon’s high quality induction possible: works for standards as experienced automotive semiconductor supplier. After several hundred both encoders and tonewheels 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. High resistance to piezo effects: suits sensor overmolding wide operating temperature range C type with 1.8nF overmolded capacitor: enhances EMC & microbreak resistance, without any external components Available with integrated back bias magnet (iBB) www.infineon.com/magnetic-sensors Product Brief TLE4941plusC/CB Differential Hall IC for Wheel Speed Sensing TLE4941plusC Block Diagram Power Supply Management Unit VDD BandgapBiasing LPFilter Main Comparator Current Modulator ESD Offset-DAC Digital-Circuit SpeedADC Speed-ADC Algorithm Hall Probes Preamplifier GND Oscillator (System-Clock) Fuses The TLE4941plusC signal path includes a pair of hall probes (2mm 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 signalSpeed 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 SP000478508 PG-SSO-2-53 SP000913556 PG-SSOM-2-11 TLE4941plusC TLE4941plusCB 1) 1) Available 2013 Published by Infineon Technologies AG 85579 Neubiberg, Germany © 2012 Infineon Technologies AG. All Rights Reserved. Visit us: www.infineon.com Order Number: B142-H9533-G1-X-7600 Date: 12 / 2012 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. 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