TLE4941/4941C TLE4941 Q62705-K714 TLE4941C Q62705-K715 TLE4941-1 Q62705-K719

TLE4941/4941C Smar t Hall Effect ICs for Active Wheel Sp eed Sensing Applications Modern ABS systems Transmission speed sensing

Pr oduc t Br ief TLE4941/4941C 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 Speed ADC Offset DAC Hall Probes 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