Sense & Control
Product Information
2014-03-10
TLE4941plusC
TLE4941plusCB
TLE4941plusC
Advanced Differential Speed Sensor
TLE4941plusCx
Advanced Diff. Speed Sensor
Table of Contents
Product Information 2 2014-03-10
Table of Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1 Target Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.2 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2 Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.2 Marking and data matrix code description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.3 Output Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.4 Under voltage Behavior . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
3 Specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3.1 Operating Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3.2 Electrical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3.3 Magnetic Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.3.1 Description of Magnetic Field . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.4 Application Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3.5 Typical Diagrams (measured performance) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3.6 Typical Operating Characteristics - TLE4941plusCB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.7 Reference Target Wheel - TLE4941plusCB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4 Package Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4.1 Package and Packing Dimensions - TLE4941plusC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4.2 Package and Packing Dimensions - TLE4941plusCB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Table of Contents
TLE4941plusCx
Advanced Diff. Speed Sensor
General
Product Information 3 2014-03-10
1 General
1.1 Target Application
The Hall Effect sensor IC TLE4941plusC is designed to provide information about rotational speed to modern
vehicle dynamics control systems and Anti-Lock Braking Systems (ABS). The output has been designed as a two
wire current interface. The sensor oper ates without extern al components and combines a fast power-up time with
a low cut-off frequency. Designed specifically to meet harsh automotive requirements, excellent accuracy and
sensitivity is specified over a wide temperature range and robustness to ESD and EMC has been maximized.
State-of-the art BiCMOS technology is used for monolithic integration of the active sensor areas and the signal
conditioning circuitry. F inally, the optimized piezo compensation and the integrated dynamic offset co mpensation
enables ease of manufacturing and the elimination of magnetic offsets.
The TLE4941plusC is provided with an overmolded 1.8 nF capacitor for improved EMC performance.
Infineon also offers customer the possibility to buy sensors with already attached back bias magnets (CB version).
1.2 Features
• Two-wire current interface
• Dynamic self-calibration principle
• Single chip solution
• No external components needed
• High sensitivity
• South and no r th po le pre-in du ct io n pos s ible
• High resistive to piezo effects
• Large operating air-gaps
• Wide operating temperature range
• TLE4941plusC: 1.8 nF overmolded capacitor
• Applicable for small pitches (2mm Hall element distance)
• Integrated back bias magnet as an option
Type Order Code Marking Package
TLE4941plusC SP000478508 41CPA PG-SSO-2-53
TLE4941plusCB SP000913556 941D00 PG-SSOM-2-11
TLE4941plusCx
Advanced Diff. Speed Sensor
Functional Description
Product Information 4 2014-03-10
2 Functional Description
2.1 General
The differential 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 ba ck biasing permanent magnet. Either south or north pole of the magnet
can be attached to the back side of the IC package.
Magnetic offsets of up to ± 30mT and device offsets are cancelled by a self-calibration algorithm. Only a few
magnetic edges are necessary for self-calibration. After the offset calibration sequence, switching occurs when
the input signal crosses the arith metic mean of its max. an d min. value (e .g. zero-cr ossing for sinusoidal signa ls).
The ON and OFF s ta te of the IC are ind ica te d by High and Low current consumption.
2.2 Marking and data matrix code description
Figure 2-1 Front side and Backside Marking of PG-SSO-2-53
Figure 2-2 Marking of PG-SSO-2-53
V
DD
GND
V
DD
GND
G: green package
YY: production year
WW: production
week
123456 :
41 C PA - > T LE4941 pl usC
TLE4941plusCx
Advanced Diff. Speed Sensor
Functional Description
Product Information 5 2014-03-10
2.3 Output Description
Under ideal conditi ons, the outpu t shows a duty cycle of 50%. Unde r real conditions, the duty cycle is determ ined
by the mechanical dimensions of the targ et wheel and its toler ances (40% to 60% might be e xceeded for pitch >>
4mm due to the zero-crossing principle).
Figure 2-3 Speed Signal (half a period = 0.5 x 1/fspeed)
Figure 2-4 Definition of Rise and Fall Time; Duty Cycle = t1/T x 100%
2.4 Under voltage Behavior
The voltage supply compar ator has an integrated hystere sis Vhys with the maximum value of the release level Vrel
< 4.5V. This determines the minimum required supply voltage VDD of the chip. A minimum hysteresis Vhys of 0.7V
is implemented thus avoiding a toggling of the output when the supply voltage VDD is modulated due to the
additional voltage dr op a t RM when switching from low to high current leve l and VDD = 4.5V (designed for use with
RM = 75Ω.).
Figure 2-5 Start-up and undervoltage behavior
Spee d Signal
Sensor Internal
Transferred
Spee d Signal
10%
50%
90%
IHigh
t
t1
T
Ilow
trtf
TLE4941plusCx
Advanced Diff. Speed Sensor
Specification
Product Information 6 2014-03-10
3 Specification
3.1 Operating Range
3.2 Electrical Characteristics
Table 3-1 Operating Range
Parameter Symbol Values Unit Note / Test Condition
Min. Max.
Supply voltage VDD
Extended
Range
4.5
20 20
24 V Directly on IC leads; includes not the
voltage drop at Rm
Junction temperature Tj-40 +170 °C time limited
Pre-induction B0-500 +500 mT
Pre-induction offset between
outer probes
Δ
Bstat., l/r -30 +30 mT
Differential Induction ΔB-120 +120 mT
Magnetic signal frequency fmag 1 10000 Hz
Table 3-2 Electrical Characteristics
Parameter Symbol Values Unit Note / Test Condition
Min. Typ. Max.
Supply current ILow 5.9 7 8.4 mA
Supply current IHigh 11.8 14 16.8 mA
Output rise/fall slew rate
TLE4941plusC tr, tf8
822
26 mA/µs RM = 75 Ω +/-5%
Tj < 125°C
Tj < 170°C
Power up time 100 us
Magnetic edges required for
offset calibration nstart 4 magn.
edges 5th edge correct
Number of edges in uncalibrated
mode nDZ-Startup 4 edges
Number of edges suppressed 0 after power on or rese t
Magnetic edges required for first
output pulse 1 2 after power on or reset
Duty cycle DC 40 50 60 % @ΔB ≥2 mT sine wave see
Figure 6
Signal frequency f1
2500 2500
10000 Hz
TLE4941plusCx
Advanced Diff. Speed Sensor
Specification
Product Information 7 2014-03-10
3.3 Magnetic Characteristics
3.3.1 Description of Magnetic Field
Figure 3-1 Description of differential field dB and switching threshold dBlimit (calibrated mode)
Time before chip reset ΔtReset 590 848 ms
Signal behavior after
undervoltage or standstill > tReset
Number of magnetic edges
where the first switching occur
nDZ-Start 1 2 edge Magnetic edge amplitude
according to Δˆ
Bstartup. td,input
has to be taken into account
Table 3-3 Magnetic Characteristics
Parameter Symbol Values Unit Note / Test Condition
Min. Typ. Max.
Limit threshold
1 Hz < fmag < 2500 Hz
2500 Hz < fmag < 10000 Hz
ΔBLimit 0.7 mT –
Magnetic differential field
change necessary for startup
1 Hz < f < 2500 Hz
2500 Hz < f < 10000 Hz
Δˆ
Bstartup 1.4 mT Magnetic field change for
startup with the firs t edge
Table 3-2 Electrical Characteristics
Parameter Symbol Values Unit Note / Test Condition
Min. Typ. Max.
dB_limit
dB_limit
14mA
7mA
dB
TLE4941plusCx
Advanced Diff. Speed Sensor
Specification
Product Information 8 2014-03-10
Figure 3-2 Definition of field direction and sensor switching
Figure 3-3 Back-Bias field orientation - TLE4941plusCB
Left Hall Element
Right Hall Element
Definition of m agne tic f iel d:
Positiv is considered when s outh pole s hows to r ear side of IC hous in g or when
North pole s hows t o fr ont s ide (=branded) of IC housing.
(Gaussm eter : positive at nor t h pole. Dot towar ds viewer)
(front side)
7
14
North
South
Left
(Vdd) Right
(GND) 41CPA i
rightleft
Senso r h ead is folded
towards viewer
B [mT]
I [mA]
Hall
Elements
Br anded Si de
Sensor Top View
Top View
North
South
N S
South Pole Bias ing
TLE4941plusCx
Advanced Diff. Speed Sensor
Specification
Product Information 9 2014-03-10
3.4 Application Circuit
Circuit below shows the recommended application circuit with reverse bias and over voltage protection.
Figure 3-4 Application Circuit
Note: An implementation of 10Ω in VDD path reduces minimum power supply direct on leads of the sensor, but
decreases max current at D2 and makes PCB more robust. This PCB represents a compromise of minimum
power supply and current flow on D2. With higher values than 10Ω a higher minimum supply voltage and
higher robustness is reached.
3.5 Typical Diagrams (measured performance)
Figure 3-5 Supply Current = f(T) (left), Supply Current =f(VDD) (right)
D
1
R
1
D
2
C
1
V
DD
GND
TLE4941plusC
R
M
V
S
U
out
Components
D
1
: 1N4007
D
2
: Z-D iode, 27V
C
1
: 10µF, 35V
R
1
:10Ω
R
M
:75Ω
TLE4941plusCx
Advanced Diff. Speed Sensor
Specification
Product Information 10 2014-03-10
Figure 3-6 Slew Rate = f(T) , RM= 75 Ω (left), Slew Rate = f(RM) (right)
Figure 3-7 Magnetic Threshold ΔBLimit = f(T) at f = 200Hz (left), Magnetic Threshold ΔBLimit = f(f) (right)
Figure 3-8 Duty Cycle [%] ΔB=2mT at 1kHz
TLE4941plusCx
Advanced Diff. Speed Sensor
Specification
Product Information 11 2014-03-10
3.6 Typical Operating Characteristics - TLE4941plusCB
Parameters valid for the described reference target wheel.
3.7 Reference Target Wheel - TLE4941plusCB
Air gap measurements and fun ctional tests ar e done with the targe t wheel describ ed below. Any other wheel can
be used. The air gap achieve d depends on the material, tooth pitch and width of the target wheel.
Figure 3-9 Top view of reference target wheel
Table 3-4 Operating Characteristics
Parameter Symbol Limit Value Unit Remarks
min typ max
Operating Airgap AG 0.5 3.2 mm AG=0 at sensor hou sing (branded side). Valid at
25°C & 0h. No missing ou tp ut pulses .
Table 3-5 Reference target wheel geometry
Parameter Symbol Typ value Unit Remarks
Outside diam ete r d150 mm
Number of teeth Z60 -
Pitch Ratio 50:50 %
Material ST37
X
Z
Y
Z
TLE4941plusCx
Advanced Diff. Speed Sensor
Package Information
Product Information 12 2014-03-10
4 Package Information
4.1 Package and Packing Dimensions - TLE4941plusC
Pure tin covering (green lead plating) is used. Lead frame material is K62 (UNS: C18090) and contains
CuSn1CrNiTi. Product is RoHS (restriction of hazardous substances) compliant when marked with letter G in front
or after the data code marking and contains a data matrix code on the back side of the package (see also
information note 136/03). Please r efer to your key account team or regional sale s if you need further information.
Figure 4-1 Package Dimensions of PG-SSO-2-53 (Plastic Green Single Small Outline)
TLE4941plusCx
Advanced Diff. Speed Sensor
Package Information
Product Information 13 2014-03-10
Figure 4-2 Package Dimensions in mm of PG-SSO-2-53 (Plastic Single Small Outline Package)
TLE4941plusCx
Advanced Diff. Speed Sensor
Package Information
Product Information 14 2014-03-10
4.2 Package and Packing Dimensions - TLE4941plusCB
Product is RoHS (restriction of hazardous substances) compliant when marked with letter G in front or after the
data code marking and contains a data matrix code on the back side of the package. Please refer to your key
account team or regional sales if you need further information.
Figure 4-3 Package Outline Dimensions in mm of PG-SSOM-2-11
Figure 4-4 Packing dimensions of “Packing Blister Carrier Tape” in mm of PG-SSOM-2-11
For additional packages information, sort of packing and others, please see Infineon internet web page:
http://www.infineon.com/products
TLE4941plusCx
Advanced Diff. Speed Sensor
Package Information
Product Information 15 2014-03-10
Edition 2014-03-10
Published by
Infineon Technologies AG
81726 Munich, Germany
© 2014 Infineon Technologies AG
All Rights Reserved.
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