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Dynamic Differential Hall Effect Sensor IC
TLE4921-5U
Bipolar IC Features * * * * * * * * * * * * * * * Advanced performance High sensitivity Symmetrical thresholds High piezo resistivity Reduced power consumption South and north pole pre-induction possible AC coupled Digital output signal Two-wire and three-wire configuration possible Large temperature range Large airgap Low cut-off frequency Protection against overvoltage Protection against reversed polarity Output protection against electrical disturbances Type TLE4921-5U Marking 21C5U
P-SSO-4-1
Ordering Code Q62705-K664
Package PSSO4-1
The differential Hall Effect sensor TLE 4921-5U provides a high sensitivity and a superior stability over temperature and symmetrical thresholds in order to achieve a stable duty cycle. TLE 4921-5U is particularly suitable for rotational speed detection and timing applications of ferromagnetic toothed wheels such as 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.
Data Sheet
1
2002-08-02
TLE4921-5U
Pin Configuration (view on branded side of component)
2.67
Center of sensitive area 0.15
1.53
2.5 1 2 3 4
VS
Q GND C
AEP01694
Figure 1 Pin Definitions and Functions Pin No. 1 2 3 4 Symbol VS Q GND C Function Supply Voltage Output Ground Capacitor
Data Sheet
2
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TLE4921-5U
VS 1
Protection Device
Internal Reference and Supply Vreg (3V)
Hall-Probes HighpassFilter SchmittTrigger Open Collector Protection Device
Amplifier
2
Q
3 GND CF
4
AEB01695
Figure 2
Block Diagram
Data Sheet
3
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TLE4921-5U
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 a low cut-off frequency. 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 ageing and temperature influence from Schmitt-trigger input and eliminates device and magnetic offset. The TLE 4921-5U 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. Furthermore, the TLE 4921-5U can be operated in a two-wire as well as in a threewire-configuration. The output is logic compatible by high/low levels regarding on and off. Circuit Description (see Figure 2) The TLE 4921-5U 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 an open collector output. The TLE 4921-5U was designed to have a wide range of application parameter variations. Differential fields up to 80 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. The improved temperature compensation enables a superior sensitivity and accuracy over the temperature range. Finally the optimised 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 overvoltage and reverse polarity and against over-stress such as load dump, etc., in accordance with ISO-TR 7637 and DIN 40839. The output (pin 2) is protected against voltage peaks and electrical disturbances.
Data Sheet
4
2002-08-02
TLE4921-5U
Absolute Maximum Ratings Tj = - 40 to 150 C Parameter Supply voltage Output voltage Output current Output reverse current Capacitor voltage Junction temperature Junction temperature Junction temperature Junction temperature Storage temperature Thermal resistance P-SSO-4-1 Current through inputprotection device Current through outputprotection device Symbol VS VQ IQ - IQ VC Tj Tj Tj Tj TS Rth JA ISZ IQZ Limit Values min. max. 1) 30 - 35 - 0.7 - - - 0.3 - - - - - 40 - - - 30 50 50 3 150 160 170 210 150 190 200 200 Unit V V mA mA V C C C C C K/W mA mA Remarks - - - - - 5000 h 2500 h 1000 h 40 h - - t < 2 ms; v = 0.1 t < 2 ms; v = 0.1
Electro Magnetic Compatibility ref. DIN 40839 part 1; test circuit 1 Testpulse 1 Testpulse 2 Testpulse 3a Testpulse 3b Testpulse 4 Testpulse 5
1)
VLD VLD VLD VLD VLD VLD
Level IV -100 V Level IV 100 V Level IV -150V Level IV 100V -7V Level IV Level IV 86,5V
C B C C C C
Reverse current < 10mA
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
5
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TLE4921-5U
ESD Protection Human Body Model (HBM) tests according to: Parameter ESD - protection
Symbol
max. 2
Unit kV
Remarks According to standard EIA/JESD22-A114-B HBM
VESD
Operating Range Parameter Supply voltage Junction temperature Pre-induction Symbol VS Tj B0 B Limit Values min. max. 4.5 24
- 40 - 500
Unit V C mT
Remarks
- -
170 500
at Hall probe; independent of magnet orientation
-
Differential induction
- 80
80
mT
Note: In the operating range the functions given in the circuit description are fulfilled. AC/DC Characteristics Parameter Supply current (1) Symbol IS Limit Values Unit Test Conditions min. typ. max. mA VQ = high 3.8 5.3 8.0 IQ = 0 mA mA VQ = low 4.3 5.9 8.8 IQ = 40 mA - - -1 0.25 - 0 0.6 50 1 V A mT IQ = 40 mA VQ <= 24 V - 20 mT < B < 2)3) 20 mT f = 200 Hz f = 200 Hz, B = 20 mT Test Circuit 1 1 1 1 2
Output saturation VQsat voltage Output leakage IQL current Centre of Bm switching points: (BOP + BRP)/2 Operate point Data Sheet BOP
-
- 6
0
mT
2 2002-08-02
TLE4921-5U
Release point Hysteresis Overvoltage protection at supply voltage at output Output rise time
BRP BHy VSZ VQZ tr
0 0.5
- 1.5
- 2.5
mT mT
f = 200 Hz, B = 20 mT f = 200 Hz, B = 20 mT IS = 16 mA IQ = 16 mA IQ = 40 mA CL = 10 pF
2 2
27 27 -
- - -
35 35 0.5
V V s
1 1 1
AC/DC Characteristics (cont'd) Parameter Output fall time Delay time Symbol tf Limit Values min. typ. max. - - 0.5 - - 0 43 -5 1.6
4)
Unit s s s s k mV/ mT
Test Test Conditions Circuit IQ = 40 mA CL = 10 pF f = 10 kHz B = 5 mT 25 C 2 C - B = 0 B = 5 mT F=2N 1 2
tdop - - tdrp tdop-tdrp - RC SC VC f Bm BHy 35 -
25 10 15 52 - 2.4 20000 0.1 0.1
Filter input resistance Filter sensitivity to B Filter bias voltage Frequency Resistivity against mechanical stress (piezo)
2) 3)
1 1 1 2 2
2 - -
V Hz mT mT
- 0.1 - 0.1
The Current consumption characteristic will be different and the specified values can slightly change Leakage currents at pin 4 should be avoided. The bias shift of Bm caused by a leakage current IL can be calculated by: Bm = (IL x RC(T))/SC(T) For higher B the values may exceed the limits like following |Bm| < |0.05 x B| Depends on filter capacitor CF. The cut-off frequency is given by f = 1/(2 x RC x CF). The switching points are guaranteed over the whole frequency range, but amplitude modification and st phase shift due to the 1 order high-pass filter have to be taken into account.
4) 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 = 25=C and the given supply voltage. Data Sheet 7 2002-08-02
TLE4921-5U
RP
300
VSZ 1 VS
S
RL
VLD 4.7 nF
VS
C
1)
4
C
Q
2
Q , QR
V VC GND 3
QSat
,V
QZ
CL
1)
VC R = C C
AES01696
Figure 3
Test Circuit 1
1 VS 1k 2 f min f max B OP B Hy
VS
4
C
Q
VQ
CF 470 nF
GND 3
AES01258
Figure 4
Test Circuit 2
Data Sheet
8
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TLE4921-5U
Application Configurations Two possible applications are shown in Figure 7 and Figure 8 (Toothed and Magnet Wheel). The difference between two-wire and three-wire application is shown in Figure 9. Gear Tooth Sensing In the case of ferromagnetic toothed wheel application the IC has to be biased by the south or north pole of a permanent magnet (e.g. SmCO5 (Vacuumschmelze VX145)) 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 toothed wheel that is used (dimensions, material, etc.; resulting differential field) a centred distance of Hall probes b Hall probes to IC surface L IC surface to tooth wheel a = 2.5 mm b = 0.3 mm
N S b L a
AEA01259
Figure 5
T
Sensor Spacing Conversion DIN - ASA m = 25.4 mm/p T = 25.4 mm CP ASA p diameter pitch PD pitch diameter CP circular pitch p = z/d (inch) PD = z/p (inch) CP = 1 inch x=/p
d
AEA01260
DIN d z m T
diameter (mm) number of teeth module m = d/z (mm) pitch T = =x m (mm)
Figure 6 Data Sheet
Toothed Wheel Dimensions 9 2002-08-02
TLE4921-5U
Gear Wheel
Hall Sensor 1
Hall Sensor 2
Signal Processing Circuitry
S (N) N (S)
Permanent Magnet
AEA01261
Figure 7
TLE 4921-5U, with Ferromagnetic Toothed Wheel
Magnet Wheel
S N
Hall Sensor 1
S
Hall Sensor 2
Signal Processing Circuitry
AEA01262
Figure 8 Data Sheet
TLE 4921-5U, with Magnet Wheel 10
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TLE4921-5U
Two-wire-application Line 1 VS C GND 3 VSIGNAL RS Q RL 2
VS
4 CF 470 nF
Sensor for example : R L = 330 R S = 120
Mainframe
AES01263
Three-wire-application Rp 1 VS C GND 3 Q Line RL 2 4.7 nF 4.7 nF VSIGNAL
VS
4 CF 470 nF
Sensor for example : R L = 330 R P = 0 ... 330
Mainframe
AES01264
Figure 9
Application Circuits
Data Sheet
11
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TLE4921-5U
N (S) S (N) 1 B1 Wheel Profile B2 Missing Tooth 4
Magnetic Field Difference B = B2-B1
Small Airgap Large Airgap B RP = 0.75 mT B HYS
B OP = -0.75 mT
Output Signal VQ
Operate point : B2 - B1 < B OP switches the output ON (VQ = LOW) Release point : B2 - B1 > BRP switches the output OFF (VQ = HIGH) B = B + B
RP OP HYS
The magnetic field is defined as positive if the south pole of the magnet shows towards the rear side of the IC housing.
AED01697
Figure 10
System Operation
Data Sheet
12
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TLE 4921-5U
Quiescent Current versus Supply Voltage I out = 40mA
10,0 9,0 8,0 7,0 Is [mA] 6,0 5,0 4,0 3,0 2,0 1,0 0,0 0 5 10 Vs [V] 15 20 25 Is on Is off Is diff
Quiescent Current versus Temperature I on = 40 mA
10,0 Is on 8,0 Is off Is diff 6,0
Is [mA]
4,0
2,0
0,0 -50 -30 -10 10 30 50 70 90 110 130 150 170 190 210 Tj [C]
Data Sheet
13
2002-08-02
TLE4921-5U
Quiescent Current versus Output Current
VS = 12V
10,0 9,0 8,0 7,0 6,0
Is [mA]
5,0 4,0 3,0 2,0 1,0 0,0 0 10 20
Iout [mA]
Is on
30
40
50
Saturation Voltage versus Temperature Vs= 4,5V Iout =50mA 400 350 300 250 200 150 100 50 0 -50 0 50 Tj [C] 100 150 200
Data Sheet
Vout [m V]
14
2002-08-02
TLE4921-5U
Output saturation voltage vs. Iout @ 25C Tj Iout +/-50mA, Vs=4,5V 300 200 100 Out sat voltage [mV] 0 -100 -200 -300 -400 -60
-40
-20
0 Iout [mA]
20
40
60
Saturation Voltage versus supply voltage Iout= 40mA Tj = 25C 0,400 0,350 0,300 V out [V] 0,250 0,200 0,150 0,100 0,050 0,000 0 5 10 15 Vs [V] 20 25 30
Data Sheet
15
2002-08-02
TLE4921-5U
2
Center of Switching Points versus Temperature Bm = (Bop+Brp )/2 f = 200Hz
1 max typ Bm [mT] 0 min
-1
-2 -60 -40 -20 0 20 40 60 80 Tj [C] 100 120 140 160 180 200
Hysteresis versus Temperature Bhy = Brp-Bop f = 200Hz typ
3
max min
Bhy [mT]
2
1
0 -60 -40 -20 0 20 40 60 80 Tj [C] 100 120 140 160 180 200
Data Sheet
16
2002-08-02
TLE4921-5U
Minimum Switching Field versus Frequency CF =1
1,5
Tj= 25C Tj= -40C
1,0 Bmin [mT] 0,5 0,0 0,01 0,1 1 f [kHz] 10 100
Minimum Switching Field versus Frequency CF =1
1,5 Tj=150C Tj=170C
1,0 Bmin [mT] 0,5 0,0 0,01 0,1 1 f [kHz] 10 100
Data Sheet
17
2002-08-02
TLE4921-5U
Delay Time betw een Switching Threshold B and Rising Edge of Vout at Tj = 25C
25 Sw itching points related to initial Measurement @ B = 2mT, f =200Hz
20
"delta B = 2mT" "delta B = 5mT"
t dop [s]
15
10
5
0 0 5000 10000 f [Hz] 15000 20000 25000
Delay Time between Switching Threshold B and Falling Edge of Vout at Tj = 25C
25 20 Sw itching points related to initial Measurement @ B = 2mT, f =200Hz
delta B = 2mT delta B = 5mT
t dop [s]
15 10
5 0 0 5000 10000 f [Hz] 15000 20000 25000
Data Sheet
18
2002-08-02
TLE4921-5U
Delay Time versus Differential Field
Sw itching points related to initial measurement @ B = 2 mT, f = 200 Hz
10 9 8 td [s] 7 6 5 4 0 10 20 30 40 B[mT] 50 60 70 80 90
td rp td op
De la y Time versus Temperature
Sw itching points related to initial measurement @ B 2 mT, f = 200 Hz
8,50 8,00 7,50 t [s] 7,00 6,50 6,00 5,50 5,00 -60 -10 40 T[C] 90 140 td rp td op
Data Sheet
19
2002-08-02
TLE4921-5U
Rise and Fall T ime versus Temperature
I ou = 40 mA
40 35
30 t [ns]
25 20 15 10 -50 0 50 Tj [C] 100 150 200
tr tf
Rise and Fall T ime versus Output Current T j = 25C
120 100 80
t [ns] tr tf
60 40 20 0 0 20 40
Iout [m A]
60
80
100
Data Sheet
20
2002-08-02
TLE4921-5U
Capacitor Voltage Versus Temperature
3,00 2,50 typ 2,00
Vc [V]
1,50 1,00 0,50 0,00 -50 0 50
Tj [C]
100
150
200
Switching Thresholds versus Mechanical @ 25 Tj St
1,00 max min Brp, ( Bop) 0,80
0,90
0,70
0,60
0,50 0 1 2 F [N] 3 4 5
Data Sheet
21
2002-08-02
TLE4921-5U
Filter Sensitivity versus T emperature
0 -1 -2 -3 -4
typ
Sc [mV/mT]
-5 -6 -7 -8 -9 -10 -50 0 50 100 150 200
Tj [C]
Filter Input Resistance versus Temperature
1,6 1,5 1,4 1,3
Rc/(Rc @25C)
1,2 1,1 1,0 0,9 0,8 0,7 0,6 -50 0 50
Tj [C]
100
150
200
Data Sheet
22
2002-08-02
TLE4921-5U
Delay T ime of Power on ( Vs Switching from 0V to 4,5V ) T pon versus T emp.
@ B = 10 mT
0,40 0,35 0,30 0,25 k[ms/nF] 0,20 0,15 0,10 0,05 0,00 -50 0 50 T [C] 100 150 200 min max typ
Periodjitter (1) vs. Temp. magnetic field: f=1kHz Bp= 5mT
0,50% 0,45% 0,40% 0,35% Jitter [%] 0,30% 0,25% 0,20% 0,15% 0,10% 0,05% 0,00% -40 -20 0 20 40 60 80 100 120 140 160 180 Tj [C] TLE4921-5U
Data Sheet
23
2002-08-02
TLE4921-5U
Package Outlines P-SSO-4-1 (Plastic Single Small Outline Package)
0.15 max.
5.38 0.05 5.16 0.08
1 max.
0.2
1.9 max.
12.7 1 1x45
1 -0.1 0.25
0.05
3.38 0.06
3.71 0.08
(0.25)
0.6 max. 0.4
23.8 0.5 38 max.
+0.05
0.2 +0.1
1 -1 18 0.5 6 0.5
1 1.27 3.81
4
9 +0.75 -0.5
0.25 -0.15
Adhesive Tape
Tape 6.35 0.4 12.7 0.3 4 0.3
0.5 0.1
d
Branded Side
Hall-Probe d : Distance chip to upper side of IC P-SSO-4-1 : 0.3 0.08 mm
AEA02712
Sorts of Packing Package outlines for tubes, trays etc. are contained in our Data Book "Package Information".
Dimensions in mm
Data Sheet
24
2002-08-02
GPO05357

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