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Data Sheet, V 1.0, April 2005
TLE4923
Dynamic Differential Hall Effect Sensor IC
Se n so rs
Never
stop
thinking.
Edition 2005-04 Published by Infineon Technologies AG, St.-Martin-Strasse 53, 81669 Munchen, Germany
(c) Infineon Technologies AG 2005. All Rights Reserved.
Attention please! The information herein is given to describe certain components and shall not be considered as a guarantee of characteristics. Terms of delivery and rights to technical change reserved. We hereby disclaim any and all warranties, including but not limited to warranties of non-infringement, regarding circuits, descriptions and charts stated herein. 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.
TLE4923 Revision History: Previous Version: Page 2005-04 none V 1.0
Subjects (major changes since last revision)
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Template: mc_a5_ds_tmplt.fm / 4 / 2004-09-15
TLE4923
Table of Contents 1 1.1 1.2 2 2.1 2.2 2.3 3 4 5 6 7 8
Page
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Pin Configuration (top view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Circuit Description (see Figure 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 7 8 8
Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Operating Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Electrical Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Application Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Typical Performance Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . 19 Package Outlines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Data Sheet
4
V 1.0, 2005-04
Dynamic Differential Hall Effect Sensor IC
TLE4923
Bipolar IC
1
1.1
* * * * * * * * * * * * *
Overview
Features
Advanced performance Higher sensitivity Symmetrical thresholds High piezo resistivity Reduced power consumption South and north pole pre-induction possible AC coupled Digital output signal Two-wire interface Large temperature range Large airgap Low cut-off frequency Protection against reversed polarity
The differential Hall effect sensor TLE4923 is compatible to the TLE4921-3U, except for having a 2-wire interface. The TLE4923 provides high sensitivity, a superior stability over temperature and symmetrical thresholds in order to achieve a stable duty cycle. TLE4923 is particularly suitable for rotational speed detection and timing applications of ferromagnetic toothed wheels such as in anti-lock braking systems, transmissions, crankshafts, etc. The integrated circuit (based on Hall effect) provides a digital signal output with frequency proportional to the speed of rotation. Unlike other rotational sensors differential Hall ICs are not influenced by radial vibration within the effective airgap of the sensor and require no external signal processing.
Type TLE4923
Data Sheet
Marking 4923 B
5
Ordering Code Q62705-K408
Package PG-SSO-3-6
V 1.0, 2005-04
TLE4923
Overview
1.2
Pin Configuration (top view)
B A
1.53
2.67 2.5
0.2 B
Center of sensitive area 1 2 3
0.2 A
VS
GND
C
AEP02039
Figure 1
Table 1 Pin No. 1 2 3
Pin Definitions and Functions Symbol Function Supply voltage Ground Capacitor
VS
GND
C
Data Sheet
6
V 1.0, 2005-04
TLE4923
General
2
2.1
General
Block Diagram
VS
1
Protection Device
Internal Reference and Supply
VREG (3V)
Hall-Probes SchmittTrigger
Amplifier
HighpassFilter
2 GND
3 CF
AEB01896
Figure 2
Block Diagram
Data Sheet
7
V 1.0, 2005-04
TLE4923
General
2.2
Functional Description
The Differential Hall sensor IC detects the motion and position of ferromagnetic and permanent magnet structures by measuring the differential flux density of the magnetic field. To detect ferromagnetic objects the magnetic field must be provided by a back biasing permanent magnet (south or north pole of the magnet attached to the rear unmarked side of the IC package). Using an external capacitor the generated Hall voltage signal is slowly adjusted via an active high pass filter with low frequency cut-off. This causes the output to switch into a biased mode after a time constant is elapsed. The time constant is determined by the external capacitor. Filtering avoids aging and temperature influence from Schmitt-trigger input and eliminates device and magnetic offset. The TLE4923 can be exploited to detect toothed wheel rotation in a rough environment. Jolts against the toothed wheel and ripple have no influence on the output signal. The on and off state of the IC are indicated by high and low current consumption.
2.3
Circuit Description (see Figure 2)
The TLE4923 is comprised of a supply voltage reference, a pair of Hall probes spaced at 2.5 mm, differential amplifier, filter for offset compensation, Schmitt-trigger, and a switched current source. The TLE4923 was designed to have a wide range of application parameter variations. Differential fields up to 40 mT can be detected without influence to the switching performance. The pre-induction field can either come from a magnetic south or north pole, whereby the field strength up to 500 mT or more will not influence the switching points 1). The improved temperature compensation enables a superior sensitivity and accuracy over the temperature range. Finally, the optimized piezo compensation and the integrated dynamic offset compensation enable easy manufacturing and elimination of magnet offsets. Protection is provided at the input/supply (pin 1) for reverse polarity.
1) Differential bias fields exceeding 20 mT, e. g. caused by a misaligned magnet, should be avoided.
Data Sheet
8
V 1.0, 2005-04
TLE4923
Maximum Ratings
3
Table 2 Parameter
Maximum Ratings
Absolute Maximum Ratings Symbol min. Limit Values max. 24 3 150 160 170 190 150 190 V V C 5000 h 2500 h 500 h 4h -18 1) -0.3 - - - - -40 - Unit Remarks
Supply voltage Capacitor voltage Junction temperature
VS VC Tj
Storage temperature Thermal resistance
TS RthJA
C K/W
2)
1) Reverse current drawn by the device < 10 mA 2) Can be reduced significantly by further packaging process, e. g. overmolding. The device is ESD protected up to 2 kV (HL test procedure)
Note: Stresses above those listed here may cause permanent damage to the device. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
Data Sheet
9
V 1.0, 2005-04
TLE4923
Operating Range
4
Table 3 Parameter
Operating Range
Operating Range Symbol min. Limit Values typ. - - - - - - max. 18 150 160 170 190 500 V C 5000 h 2500 h 500 h 4h At Hall probe; independent of magnet orientation 4.5 -40 - - - -500 Unit Conditions
Supply voltage Junction temperature
VS Tj
Pre-induction
B0
B
mT
Differential induction
-40
-
40
mT
Note: Unless otherwise noted, all temperatures refer to junction temperature. In the operating range the functions given in the circuit description are fulfilled.
Data Sheet
10
V 1.0, 2005-04
TLE4923
Electrical Parameters
5
Table 4 Parameter
Electrical Parameters
Electrical Characteristics The device characteristics listed below are guaranteed in the full operating range. Symbol min. Limit Values typ. 4.1 10.5 6.4 2.4 0 max. 5.3 13.6 8.3 3 0.5 mT mA mA mA 3.1 8.1 5.0 2 -0.5 Unit Test Condition Test Circuit 1 1 1 1 B = 2.0 mT, 2 f = 200 Hz, -40C < Tj 150C 1) 2) B = 2.0 mT, 2
Supply current Supply current difference Supply current ratio
IS ISON ISOFF ISON / ISOFF
Bm Center of switching points: (BOP + BRP) / 2 Bm Center of switching points: (BOP + BRP) / 2 Hysteresis BH
-0.7
0
0.7
mT
f = 200 Hz, 150C < Tj
1 - - 1.5 - - 2.2 0.5 0.5 25 10 15 35 43 8.5 1.6
5)
< 190C 1) 2) B = 2.0 mT, 2 f = 200 Hz 3) 2 2
mT s s s s s k mV/ mT
Current rise time tr Current fall time Delay time
4)
Filter input resistance Filter sensitivity to B Filter bias voltage Frequency
tf tdop tdrp tdop - tdrp RC SC VC f
B = 5 mT
f = 10 kHz,
2
52
25C 2C 25C 2C B = 0 B = 5 mT
1 1 1 2
2.0
2.4 10000
V Hz
Data Sheet
11
V 1.0, 2005-04
TLE4923
Electrical Parameters Table 4 Parameter Resistivity against mechanical stress (piezo) 6) Power supply rejection ratio (PSRR) Electrical Characteristics (cont'd) The device characteristics listed below are guaranteed in the full operating range. Symbol min. Bm BH -0.1 -0.1 Limit Values typ. - - max. 0.1 0.1 mT mT Unit Test Condition F=2N Test Circuit 2
VPSRR
10
-
-
V
B = 0, only 1 transition may occur
VS modulated 2 7) with VPSRR, fPSRR = 10 kHz, tr,fPSRR = 1 s,
1) For B values larger than 10 mT this value may exceed the limits as follows: | Bm | < | 0.05 x B | 2) Leakage currents at pin 3 should be avoided. The bias shift of Bm caused by a leakage current IL can be calculated by: B m =
IL x RC ( T ) SC ( T )
-------------------- . See also the typical curves on Page 22. -
3) Differential pre-induction (e.g. by magnetic misalignment) has to be smaller than 20 mT. 4) For definition see Figure 6. 1 5) Depends on filter capacitor CF. The cut-off frequency is given as f = --------------------------------------- . The switching points 2 x x RC x CF are guaranteed over the whole frequency range, but amplitude modification and phase shift have to be taken into account due to the 1st order highpass filter. 6) For definition see Figure 7. 7) For definition see Figure 5.
Note: The listed characteristics are ensured over the operating range of the integrated circuit. Typical characteristics specify mean values expected over the production spread. If not otherwise specified, typical characteristics apply at Tj = 25C and the given supply voltage.
Data Sheet
12
V 1.0, 2005-04
TLE4923
Electrical Parameters
RP
180
V SZ
1
S
VS
VLD
4.7 nF
VS
C
1)
3
C
TLE4923
VC
C
GND 2
AES01897
1)
RC =
VC C
Figure 3
Test Circuit 1
1 VS
VS
3C
TLE4923
1 F
CF
GND 2
RS 180
AES01898
Figure 4
Test Circuit 2
Data Sheet
13
V 1.0, 2005-04
TLE4923
Electrical Parameters
18 V
V PSRR
8V
tr
tf
AED02488
Figure 5
B RP B OP
B
t drp : Delay Time between B = B RP and S LOW to HIGH transient
t drp
t dop
t dop : Delay Time between B = B OP and S HIGH to LOW transient
S
AED02509
Figure 6
Definition of Delay Times (switching points related to initial measurement @ B = 2 mT; f = 200 Hz)
F = 2N r = 0.5 0.05 mm IC
4 x d = 1.5
AEA02508
Figure 7
Data Sheet
Setup for Piezo Measurements
14 V 1.0, 2005-04
TLE4923
Application Notes
6
Application Notes
Two possible applications are shown in Figure 10 and Figure 11 (Toothed and Magnet Wheel). Two-wire application is shown in Figure 12. Gear Tooth Sensing In the case of ferromagnetic toothed wheel applications the IC has to be biased by the south or north pole of a permanent magnet (e.g. SmCo5 (Vacuumschmelze VX170) with the dimensions 8 mm x 5 mm x 3 mm) which should cover both Hall probes. The maximum air gap depends on: - the magnetic field strength (magnet used; pre-induction) and - the tooth wheel that is used (dimensions, material, etc.; resulting differential field). a centered distance of Hall probes b Hall probes to IC surface L IC surface to tooth wheel a = 2.5 mm b = 0.3 mm Figure 8 Sensor Spacing
N S b L a
AEA01259
T
Conversion DIN - ASA
d
AEA01260
m = 25.4 mm/p T = 25.4 mm CP
ASA diameter (mm) number of teeth module m = d/z (mm) pitch T = x m (mm) Tooth Wheel Dimensions
15 V 1.0, 2005-04
DIN
d z m T
Figure 9
Data Sheet
p
PD CP
diameter pitch p circular pitch
= z/d (inch)
pitch diameter PD = z/p (inch) CP = 1 inch x /p
TLE4923
Application Notes
Gear Wheel
Hall Sensor 1
Hall Sensor 2
Signal Processing Circuitry
S (N) N (S)
Permanent Magnet
AEA01261
Figure 10
TLE4923, with Ferromagnetic Toothed Wheel
Magnet Wheel
S N
Hall Sensor 1
S
Hall Sensor 2
Signal Processing Circuitry
AEA01262
Figure 11
Data Sheet
TLE4923, with Magnet Wheel
16 V 1.0, 2005-04
TLE4923
Application Notes
Two-wire-application Line 1 3 1
VS
VS
C GND 2
CS
4.7 nF
CF
1 F
VSIGNAL RS
Sensor typical : RS = 180
Mainframe
AES01899
Figure 12
Application Circuit
Data Sheet
17
V 1.0, 2005-04
TLE4923
Application Notes
N(S) S(N) 1 3
B1
Wheel Profile
B2
Missing Tooth
Magnetic Field Difference B = B2 _ B1 BRP = 0.75 mT
Small Airgap Large Airgap
BHY
BOP = _ 0.75 mT
Output Signal IS
Operate point: B2 _ B1 < BOP switches the output ON high current Release point: B2 _ B1 > BRP switches the output OFF low BRP = BOP + BHY The magnetic field is defined as positive if the south pole of the magnet shows towards the rear side of the IC housing.
(
)
AED01900
Figure 13
System Operation
Data Sheet
18
V 1.0, 2005-04
TLE4923
Typical Performance Characteristics
7
Typical Performance Characteristics
Minimum Switching Field versus Frequency
1.2 mT
AED02475
If not otherwise specified, all curves reflect typical values at Tj = 25C and VS = 12 V. Supply Current and Supply Current Difference versus Supply Voltage
12
AED02473
S
mA 10
SON
B min
T j = 190 C
1.0
8
0.8
T j = 150 C T j = 25 C
6
SON SOFF
0.6
T j = -40 C
4
SOFF
0.4
2
0.2
0
0
5
10
15
20 V 25 VS
0
1
10
100
1000 Hz 10000 f
Supply Current and Supply Current Difference versus Temperature
12 mA 10
AED02474
Mean Value of Switching Induction
1.2 mT 1.0
AED02476
S
SON
B m
8
0.8
6
SON SOFF SOFF
0.6
4
0.4
2
0.2
B OP B RP 2 f = 200 Hz B m =
typ
0 -40
0
40
80
120
C Tj
200
0 -40
0
40
80
120
C Tj
200
Data Sheet
19
V 1.0, 2005-04
TLE4923
Typical Performance Characteristics Hysteresis versus Temperature
1.6 mT 1.4 typ 1.2
AED02477
Delay Time 1) versus Temperature
8 s td 7 6 5 4 3 2
AED02479
B H
t dop t drp
B H = B RP B OP
f = 200 Hz
1.0
0.8
0.6
1
0.4 -40
0
40
80
120
C Tj
200
0 -50
0
50
100
150 C 200 Tj
Delay Time 1) versus Differential Field
6.0 s t d 5.9 5.8 5.7 5.6 5.5 5.4 5.3 5.2 5.1 5.0 0 2 4 6 8
AED02478
Rise and Fall Time versus Temperature
140 ns
AED02480
f = 10 kHz
t
120 100
tf tr
80
t dop
60 40
t drp
20 0 -50
mT B
12
0
50
100
150 C 200 Tj
1) Switching points related to initial measurement @B = 2 mT, f = 200 Hz
Data Sheet
20
V 1.0, 2005-04
TLE4923
Typical Performance Characteristics Capacitor Voltage versus Temperature
2.5
AED02481
Filter Input Resistance versus Temperature
60 k 50
AED02483
VC V
2.0 typ
RC
typ 40
1.5
30
1.0
20
0.5
10
0 -50
0
50
100
150 C 200 Tj
0 -50
0
50
100
150 C 200 Tj
Filter Sensitivity versus Temperature
0 mV/mT S C -2 -4
AED02482
Delay Time tpon for Power ON versus Temperature
0.8 ms/nF t pon = k C F (nF) k 0.7 0.6
AED02484
max 1)
-6 typ -8
0.5
VS = 12 V
-10 -12 -14
0.4 0.3 0.2 min 1)
-16 -18 -20 -50 0 50 100 150 C 200 Tj
1)
0.1 0 -50
0
50
100
150 C 200 Tj
Calculated values for minimum and maximum filter resistance, C F at room temperature.
Data Sheet
21
V 1.0, 2005-04
TLE4923
Typical Performance Characteristics Threshold Shift versus Filter Leakage
8 mT B m 7 6 5 4 3 2 1 0 +190C +100C +25C -40C
AED02485
0
20
40
60
80 M 100 RC
d
Branded Side
Hall-Probe
d : Distance chip to branded side of IC PG-SSO-3-6 : 0.30 0.08 mm
AEA02920
Figure 14
Distance Chip to Upper Side of IC
Data Sheet
22
V 1.0, 2005-04
TLE4923
Package Outlines
8
Package Outlines
5.34 0.05 5.16 0.08
0.2
2A
0.1 MAX.
12.7 1 1.9 MAX.
CODE CODE
1 -0.1 0.25 0.05
1.2 0.1 7 7
1 x 451
CODE
(14.8) (Useable Length)
3.38 0.06
3.71 0.08
1 MAX.1) (0.25)
0.6 MAX.
0.87 0.05
23.8 0.5
0.2 +0.1
0.5
38 MAX. 1 -1 18 0.5
0.1
1.67 0.05
123
1.9 MAX. 1.905
0.5
0.4 0.05
+0.7 9 -0.5 5
A
6 0.5
1.905
2x
Adhesive Tape Tape 0.25 -0.15 0.39 0.1
6.350.4
4 0.3 12.70.3 Total tolerance at 10 pitches 1
1) No solder function area
GPO05960
Figure 15
PG-SSO-3-6 (Plastic Single Small Outline Package)
You can find all of our packages, sorts of packing and others in our Infineon Internet Page "Products": http://www.infineon.com/products. Data Sheet 23
Dimensions in mm V 1.0, 2005-04
www.infineon.com
Published by Infineon Technologies AG

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