TLE 4941plusC, a dierential Hall sensor for measuring magnetically the car´s
wheel speed, is the latest ospring 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 dierential 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 pha-
se and higher load dump robustness. The formerly optional first-edge-detection,
a feature for quick start-up, providing a reliable output signal even before cali-
bration 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 osets are cancelled by a sophisticated self-
calibration 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 functio-
nality, robustness and flexibility.
www.infineon.com/sensors
Applications
TLE 4941plusC
Dierential Hall IC for Wheel Speed Sensing
Reliable Wheel Speed Sensing in
automotive applications
Anti-lock Braking System (ABS)
Electronic Stability Program (ESP)
Automatic Transmissions
Features
Two-wire current interface: Minimizes
wiring
Dynamic self-calibration principle:
Compensates osets
Single chip solution: Ensures outstan-
ding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 eects: Suits
sensor overmoldingwide operating
temperature range
C type with 1.8 nF overmolded capa-
citor:Enhances EMC & microbreak
resistance, without any external
components
Product Brief
TLE 4941plusC block diagram
The TLE4941plusC signal path includes a pair of hall probes (2 mm spacing), a dierential amplifier and a comparator
feeding a switched current output stage. Additionally, the circuit has a feedback loop for oset compensation which
consists of a signal-Speed ADC, a digital signal processor (DSP) and an oset 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
Product Brief
TLE 4941plusC
Dierential Hall IC for Wheel Speed Sensing
Published by
Infineon Technologies AG
85579 Neubiberg, Germany
© 2010 Infineon Technologies AG.
All Rights Reserved.
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The information given in this document shall in no event
be regarded as a guarantee of conditions or characteristics
(“Beschaenheitsgarantie”). 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 warran-
ties and liabilities of any kind, including without limita-
tion 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 Oce (www.infineon.com).
WArnings
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dangerous substances. For information on the types in
question please contact your nearest Infineon Technologies
Oce. 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
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the failure of that life-support device or system, or to aect
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B142-H9533-X-X-7600
10 / 2010