TLE4951C(B)-Highly robust differential Hall sensor

Product Brief
TLE4951C(B)
Highly robust differential Hall sensor with visible adaptive hysteresis and outstanding
vibration suppression for automotive powertrain and industrial applications
Features
The TLE4951 detects the motion of ferromagnetic structures or objects by measuring
the change of differential flux density . This changes are either generated by a moving
„„
High sensitivity
magnetic encoder or a moving ferromagnetic gear structure (e.g. Gear wheel) within a
„„
Adaptive thresholds
magnetic back bias field. The high sensitivity and very precise switching behavior ensure
„„
Visible hysteresis
excellent measurement accuracy over the whole frequency range of up to 12kHz. Like
„„
Excellent vibration suppression
many other Infineon powertrain speed sensors, the TLE4951 offers a fast power up and
„„
Large operating air gap
self-calibration phase combined with a frequent recalibration function in run mode
„„
Fast start up
using an visible adaptive hysteresis concept. In addition, the TLE4951 provides a new,
„„
Advanced performance by
outstanding vibration suppression function by using a smart algorithm. This ensures that
dynamic self calibration
no pulses are missed even under sever conditions like air gap jumps, high rotational
principle
or air gap vibration.Special care was also taken in the design to provide a precise
zero-Hertz measurement capability, which is of high benefit in e.g. new automotive
„„
Wide frequency range of
0Hz to 12kHz
transmission application with parking brake, hill holder or hill start assist functions. The
„„
Digital output signal
TLE4951 has a standard 2-wire current interface. It is provides in a module style package
„„
Wide operating temperature
with an integrated capacitor for high EMC robustness. A version with an integrated back
ranges of -40°C ≤ Tj ≤ +175°C
bias NdFeB magnet for easy usage and design-in is optionally available.
„„
South and north pole
Harsh environmental conditions prevalent in automotive or some industrial applications
„„
Module style package with an
pre-induction possible
are the home of TLE4951. As such the TLE4951 is best suited for automotive
transmission applications, speedometer applications or industrial speed sensing
integrated capacitor of 1.8nF
„„
Optional: Package with
integrated Back Bias magnet
applications.
(iBB)
Gear wheel application with back bias magnet and magnetic encoder wheel application
Magnet Wheel
Gear Wheel
Hall Sensor 1
Signal
Processing
Circuitry
S (N)
Hall Sensor 2
Hall Sensor 1
Permanent Magnet
Signal
Processing
Circuitry
Hall Sensor 2
N (S)
Back Bias Magnet
www.infineon.com/magnetic-sensors
Encoder Wheels
Product Brief
TLE4951C(B)
Highly robust differential Hall sensor with visible adaptive hysteresis and outstanding
vibration suppression for automotive powertrain and industrial applications
Block Diagram
Supply Voltage Generation
Bandgap
Supply
Comparator
Oscillator
Offset DAC
B2
2 (right)
Offset
Calculation
Amplifier Speed Path
VDD
∆B speed
g s1
B3
LPF
3 (center)
speed signal : ∆B speed =B 2–B 1
Tracking
ADC
Algorithm
Output
Protocol
GND
B1
multiplexed
ADC
1 (left)
Pre -Amplifier with dB dir calculation
dir
calc
∆B dir
Adaptive
Hysteresis
Comparator
gd
LPF
ESD
Vibration
Detection
direction signal: ∆B dir =B 3–(B 2+B 1 )/2
Back-bias Field Orientation
Current
Modulator
Product Table
Sales Name
TLE4951C
Description
Order Code
TLE4951 in standard PG‑SSO‑2‑53
SP000848256
package
S
TLE4951CB
TLE4951 with integrated back bias SP000913560
magnet in PG-SSOM-2-11 package
N
VS
GND
Published by
Infineon Technologies AG
85579 Neubiberg, Germany
© 2013 Infineon Technologies AG.
All Rights Reserved.
Visit us:
www.infineon.com
Order Number: B142-H9811-X-X-7600
Date: 07 / 2013
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.