Advanced Differential Speed Sensor TLE4941plusC

TLE4941plusC
Advanced Differential Speed Sensor
T LE4941plusC
T LE4941plusCB
Product Information
2014-03-10
Sense & Control
TLE4941plusCx
Advanced Diff. Speed Sensor
Table of Contents
Table of Contents
Table of Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
1
1.1
1.2
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Target Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2
2.1
2.2
2.3
2.4
Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Marking and data matrix code description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Output Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Under voltage Behavior . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3
3.1
3.2
3.3
3.3.1
3.4
3.5
3.6
3.7
Specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Operating Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Electrical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Magnetic Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Description of Magnetic Field . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Application Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Typical Diagrams (measured performance) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Typical Operating Characteristics - TLE4941plusCB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Reference Target Wheel - TLE4941plusCB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4
4.1
4.2
Package Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Package and Packing Dimensions - TLE4941plusC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Package and Packing Dimensions - TLE4941plusCB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Product Information
2
4
4
4
5
5
2014-03-10
TLE4941plusCx
Advanced Diff. Speed Sensor
General
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 operates without external 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. Finally, the optimized piezo compensation and the integrated dynamic offset compensation
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 north pole pre-induction possible
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
Product Information
3
2014-03-10
TLE4941plusCx
Advanced Diff. Speed Sensor
Functional Description
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 back 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 arithmetic mean of its max. and min. value (e.g. zero-crossing for sinusoidal signals).
The ON and OFF state of the IC are indicated by High and Low current consumption.
2.2
Marking and data matrix code description
V
DD
GND
GND
V
DD
G:
green package
YY:
production year
WW:
production
week
123456 :
41CPA -> TLE4941 plusC
Figure 2-1 Front side and Backside Marking of PG-SSO-2-53
Figure 2-2 Marking of PG-SSO-2-53
Product Information
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2014-03-10
TLE4941plusCx
Advanced Diff. Speed Sensor
Functional Description
2.3
Output Description
Under ideal conditions, the output shows a duty cycle of 50%. Under real conditions, the duty cycle is determined
by the mechanical dimensions of the target wheel and its tolerances (40% to 60% might be exceeded for pitch >>
4mm due to the zero-crossing principle).
Speed Signal
Sensor Internal
Transferred
Speed Signal
Figure 2-3 Speed Signal (half a period = 0.5 x 1/fspeed)
IHigh
tr
tf
90%
50%
10%
Ilow
t1
T
t
Figure 2-4 Definition of Rise and Fall Time; Duty Cycle = t1/T x 100%
2.4
Under voltage Behavior
The voltage supply comparator has an integrated hysteresis 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 drop at RM when switching from low to high current level and VDD = 4.5V (designed for use with
RM = 75Ω.).
Figure 2-5 Start-up and undervoltage behavior
Product Information
5
2014-03-10
TLE4941plusCx
Advanced Diff. Speed Sensor
Specification
3
Specification
3.1
Operating Range
Table 3-1
Operating Range
Parameter
Symbol
Supply voltage
Values
VDD
Extended
Range
Unit
Note / Test Condition
Min.
Max.
4.5
20
20
24
V
Directly on IC leads; includes not the
voltage drop at Rm
time limited
Junction temperature
Tj
-40
+170
°C
Pre-induction
B0
-500
+500
mT
Pre-induction offset between
outer probes
ΔBstat., l/r
-30
+30
mT
Differential Induction
ΔB
-120
+120
mT
Magnetic signal frequency
fmag
1
10000
Hz
3.2
Electrical Characteristics
Table 3-2
Electrical Characteristics
Parameter
Symbol
Values
Unit
Min.
Typ.
Max.
Note / Test Condition
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, tf
8
8
22
26
mA/µs RM = 75 Ω +/-5%
Tj < 125°C
Tj < 170°C
100
us
4
magn. 5th edge correct
edges
Number of edges in uncalibrated nDZ-Startup
mode
4
edges
Number of edges suppressed
0
after power on or reset
2
after power on or reset
Power up time
Magnetic edges required for
offset calibration
nstart
Magnetic edges required for first
output pulse
1
Duty cycle
DC
40
Signal frequency
f
1
2500
Product Information
50
6
60
%
2500
10000
Hz
@ΔB ≥2 mT sine wave see
Figure 6
2014-03-10
TLE4941plusCx
Advanced Diff. Speed Sensor
Specification
Table 3-2
Electrical Characteristics
Parameter
Symbol
Values
Min.
Time before chip reset
ΔtReset
Signal behavior after
nDZ-Start
undervoltage or standstill > tReset
Number of magnetic edges
where the first switching occur
Note / Test Condition
Max.
590
848
ms
1
2
edge
Magnetic edge amplitude
according to Δ Bˆ startup. td,input
has to be taken into account
Unit
Note / Test Condition
3.3
Magnetic Characteristics
Table 3-3
Magnetic Characteristics
Parameter
Typ.
Unit
Symbol
Values
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
Δ Bˆ startup
1.4
mT
Magnetic field change for
startup with the first edge
3.3.1
14mA
Description of Magnetic Field
dB
dB_limit
7mA
dB_limit
Figure 3-1 Description of differential field dB and switching threshold dBlimit (calibrated mode)
Product Information
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2014-03-10
TLE4941plusCx
Advanced Diff. Speed Sensor
Specification
B[mT]
Left Hall Element
Right Hall Element
I [mA]
14
7
Top View
Hall
Elements
Left
(Vdd)
North
North
South
South
Right
(GND)
41CPA i
left
Branded Side
(front side)
Sensor Top View
right
Sensor head is folded
towards viewer
Definition of magnetic field:
Positiv is considered when south pole shows to rear side of IC housing or when
North pole shows to front side (=branded) of IC housing.
(Gaussmeter: positive at north pole. Dot towards viewer)
Figure 3-2 Definition of field direction and sensor switching
N
S
South Pole Biasing
Figure 3-3 Back-Bias field orientation - TLE4941plusCB
Product Information
8
2014-03-10
TLE4941plusCx
Advanced Diff. Speed Sensor
Specification
3.4
Application Circuit
Circuit below shows the recommended application circuit with reverse bias and overvoltage protection.
D1
R1
TLE4941plusC
VS
VDD
Components
D1 :
1N4007
Z-Diode, 27V
D2 :
10µF, 35V
C1 :
10Ω
R1 :
RM :
75Ω
D2
GND
C1
RM
Uout
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)
Product Information
9
2014-03-10
TLE4941plusCx
Advanced Diff. Speed Sensor
Specification
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 = 2 mT at 1 kHz
Product Information
10
2014-03-10
TLE4941plusCx
Advanced Diff. Speed Sensor
Specification
3.6
Typical Operating Characteristics - TLE4941plusCB
Parameters valid for the described reference target wheel.
Table 3-4
Operating Characteristics
Parameter
Symbol Limit Value
min
Operating Airgap
3.7
AG
typ
Unit
Remarks
mm
AG=0 at sensor housing (branded side). Valid at
25°C & 0h. No missing output pulses.
max
0.5
3.2
Reference Target Wheel - TLE4941plusCB
Air gap measurements and functional tests are done with the target wheel described below. Any other wheel can
be used. The air gap achieved depends on the material, tooth pitch and width of the target wheel.
Z
Z
X
Y
Figure 3-9 Top view of reference target wheel
Table 3-5
Reference target wheel geometry
Parameter
Symbol
Typ value
Unit
Outside diameter
d
150
mm
Number of teeth
Z
60
-
50:50
%
Pitch Ratio
Material
Product Information
Remarks
ST37
11
2014-03-10
TLE4941plusCx
Advanced Diff. Speed Sensor
Package Information
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 refer to your key account team or regional sales if you need further information.
Figure 4-1 Package Dimensions of PG-SSO-2-53 (Plastic Green Single Small Outline)
Product Information
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2014-03-10
TLE4941plusCx
Advanced Diff. Speed Sensor
Package Information
Figure 4-2 Package Dimensions in mm of PG-SSO-2-53 (Plastic Single Small Outline Package)
Product Information
13
2014-03-10
TLE4941plusCx
Advanced Diff. Speed Sensor
Package Information
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
Product Information
14
2014-03-10
TLE4941plusCx
Advanced Diff. Speed Sensor
Package Information
Edition 2014-03-10
Published by
Infineon Technologies AG
81726 Munich, Germany
© 2014 Infineon Technologies AG
All Rights Reserved.
Legal Disclaimer
The information given in this document shall in no event be regarded as a guarantee of conditions or
characteristics. 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 the 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 the nearest Infineon Technologies Office. Infineon Technologies components may be
used in life-support devices or systems only with the express written approval of Infineon Technologies, if a failure
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Product Information
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2014-03-10
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