TLE4957C-Highly accurate differential Hall sensor with visible adaptive hysteresis

Product Brief
TLE4957C
Highly accurate differential Hall sensor with visible adaptive hysteresis and high vibration
robustness for automotive powertrain and industrial applications
The TLE4957C family detects the motion and position of ferromagnetic structures by
measuring the change of differential flux density which results form a moving magnetic
encoder wheel or is generated by the interaction of a magnetic back bias field with the
ferromagnetic structure of a gear wheel or similar structure. The high sensitivity and
self-calibration mode ensure optimal measurement accuracy. The sensor powers up
very fast and reaches full calibration within only a few transitions after start-up. The
combination of a frequent recalibration function in run mode with its visible or hidden
adaptive hysteresis algorithm enables the TLE4957C to accurately switch over a broad
range of different gear wheel structures with a high robustness against disturbances,
like air-gap jumps or run-out events. TLE4957 has a voltage interface with a PWM output
signal, therefore it comes with a 3-wire output, but a 2-wire configuration is possible by
using 2 resistors.
In order to perfectly meet the requirements of harsh environmental conditions prevalent in automotive applications, the sensor is designed to withstand a wide range of
temperatures, is robust against vibration, has a high ESD performance and large EMC
resistance. With its features TLE4957C family is the ideal differential Hall sensor for applications like today’s crankshaft or transmission speed sensing in automotive, speedometers or similar industrial applications.
TLE4957C is perfectly suited for applications like:
Gear Wheel Application with Back Bias Magnet and Magnetic Encoder Wheel Application
CW
CCW
CW
CCW
S (N)
CCW = Counter clock wise
CW = Clock wise
N (S)
VDD GND Q
VDD GND Q
Back Bias Magnet
www.infineon.com/magnetic-sensors
Encoder Wheels
Features
„„ High
sensitivity
thresholds
„„ Visible and hidden hysteresis
options
„„ Large operating air-gap
„„ Advanced performance by dynamic
self calibration principle
„„ Wide frequency range of
1Hz to 8kHz
„„ Digital output signal
„„ Wide operating temperature ranges
of -40°C ≤ Tj ≤ +175°C
„„ Reverse voltage protection at VS-pin
„„ Short-circuit and overtemperature
protection of output
„„ Module style package with two
integrated capacitors:
–– 4.7nF between Q and GND
–– 47nF between VS and GND:
Required for micro cuts in power
supply and optimal EMC
robustness
„„ Adaptive
Product Brief
TLE4957C
Highly accurate differential Hall sensor with visible adaptive hysteresis and high vibration
robustness for automotive powertrain and industrial applications
Block Diagram
Q
VS
Clamping & Reverse Voltage
Protection
Hyst
Comp
Overtemperature
& Short-circuit
Protection
Power Supply Regulator
Analog
Supply
N-Channel
Open Drain
Main
Comp
Digital
Supply
Enable
Hall Probes
+
Amplifier
-
Clamping
Interface
+
Filter
-
Tracking ADC
Digital
Min
Max
Algorithm
Offset
DAC
Actual Switching Level
Bias for Temperature
& Technology
Compensation
Oscillator
Reset
GND
Sales Name
Description
Order Code
TLE4957C E6747
TLE4957 hidden adaptive hysteresis in PG-SSO-3-92 package
SP000649296
TLE4957C-2 E6747
TLE4957 visible adaptive hysteresis in PG-SSO-3-92 package
SP000745374
Published by
Infineon Technologies AG
85579 Neubiberg, Germany
© 2013 Infineon Technologies AG.
All Rights Reserved.
Visit us:
www.infineon.com
Order Number: B142-H9823-X-X-7600
Date: 09 / 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).
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dangerous substances. For information on the types in
question please contact your nearest Infineon Technologies Office. Infineon Technologies Components may only
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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.