Product Brief
TLE4941/4941C
Smart Hall Effect ICs for Active Wheel Speed 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 ΔB < 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)
Functional 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
Sensors
PG-SSO-2-2
Published by Infineon Technologies AG
Product Brief
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http://www.infineon.com
Published by
Infineon Technologies AG
81726 München, Germany
© 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 informa-
tion 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.
Ordering No. B112-H7820-G1-X-7600
Printed in Germany
PS 03061. nb
Block Diagram
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 noise-
limiting low-pass filter, and a comparator
feeding a switched current output stage.
IN ADDITION 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.
Interface Description
TLE4941 outputs a conventional
square wave signal for speed
frequency.
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 %
Power Supply
Regulator
Speed
ADC
Oscillator
(syst clock)
Gain Range
Digital
Circuit
Offset
DAC
Hall Probes
PGA
GND
Main
Comp
VCC
––
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
