INFINEON TLE4921-3U

Dynamic Differential Hall Effect Sensor IC
TLE 4921-3U
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
P-SSO-4-1
Type
Marking
Ordering Code
Package
TLE 4921-3U
21C3U
Q67006-A9171
P-SSO-4-1
The differential Hall Effect sensor TLE 4921-3U provides a high sensitivity and a superior
stability over temperature and symmetrical thresholds in order to achieve a stable duty
cycle. TLE 4921-3U 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
2000-07-01
TLE 4921-3U
Pin Configuration
(view on branded side of component)
Center of
sensitive area ±0.15
1.53
2.67
2.5
1
2
3
4
VS
Q GND C
AEP01694
Figure 1
Pin Definitions and Functions
Pin No.
Symbol
Function
1
VS
Supply voltage
2
Q
Output
3
GND
Ground
4
C
Capacitor
Data Sheet
2
2000-07-01
TLE 4921-3U
VS
1
Protection
Device
Internal Reference and Supply
Vreg (3V)
Hall-Probes
Amplifier
GND
Data Sheet
Open
Collector
Protection
Device
2
Q
4
3
Figure 2
SchmittTrigger
HighpassFilter
CF
AEB01695
Block Diagram
3
2000-07-01
TLE 4921-3U
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 aging and temperature influence from Schmitt-trigger
input and eliminates device and magnetic offset.
The TLE 4921-3U 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 4921-3U can be operated in a two-wire as well as in a three-wireconfiguration.
The output is logic compatible by high/low levels regarding on and off.
Circuit Description (see Figure 2)
The TLE 4921-3U 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 4921-3U 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 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 overvoltage and reverse polarity and
against overstress 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
2000-07-01
TLE 4921-3U
Absolute Maximum Ratings
Tj = – 40 to 150 °C
Parameter
Symbol
Limit Values
min.
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
Unit
Remarks
max.
1)
VS
VQ
IQ
– IQ
VC
Tj
Tj
Tj
Tj
TS
Rth JA
– 35
30
V
–
– 0.7
30
V
–
–
50
mA
–
–
50
mA
–
– 0.3
3
V
–
–
–
–
–
150
160
170
210
°C
°C
°C
°C
5000 h
2500 h
1000 h
40 h
– 40
150
°C
–
–
190
K/W
–
ISZ
–
200
mA
t < 2 ms; v = 0.1
IQZ
–
200
mA
t < 2 ms; v = 0.1
V
V
V
V
V
V
td = 2 ms
td = 0.05 ms
td = 0.1 µs
td = 0.1 µs
td ≤ 20 s
td = 400 ms;
RP = 400 Ω
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
– 100
100
– 150
100
–7
120
Reverse current < 10 mA
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
2000-07-01
TLE 4921-3U
Operating Range
Parameter
Symbol
Limit Values
Unit
Remarks
min.
max.
4.5
24
V
–
– 40
170
°C
–
Pre-induction
VS
Tj
B0
– 500
500
mT
at Hall probe;
independent of
magnet orientation
Differential induction
∆B
– 80
80
mT
–
Supply voltage
Junction temperature
Note: In the operating range the functions given in the circuit description are fulfilled.
AC/DC Characteristics
Parameter
Symbol
Unit Test Condition
min.
typ. max.
4.7
6.1
8.0
mA
5.1
6.7
8.8
mA
Test
Circuit
Output saturation
voltage
VQSat
–
0.25 0.6
V
VQ = high
IQ = 0 mA
VQ = low
IQ = 40 mA
IQ = 40 mA
Output leakage
current
IQL
–
–
10
µA
VQ = 24 V
Center of
switching points:
(∆BOP + ∆BRP) / 2
∆Bm
–1
0
1
mT
– 20 mT < ∆B < 2
20 mT 1) 2)
f = 200 Hz
Operate point
∆BOP
–
–
0
mT
2
Release point
∆BRP
0
–
–
mT
Hysteresis
∆BHy
0.5
1.5
2.5
mT
f = 200 Hz,
∆B = 20 mT
f = 200 Hz,
∆B = 20 mT
f = 200 Hz,
∆B = 20 mT
27
27
–
–
35
35
V
V
1
1
–
–
0.5
µs
IS = 16 mA
IS = 16 mA
IQ = 40 mA
CL = 10 pF
Supply current
IS
Limit Values
Overvoltage
protection at supply VSZ
voltage at output
VQZ
Output rise time
Data Sheet
tr
6
1
1
1
1
2
2
1
2000-07-01
TLE 4921-3U
AC/DC Characteristics (cont’d)
Parameter
Symbol
Limit Values
min.
typ. max.
Unit Test Condition
Test
Circuit
IQ = 40 mA
CL = 10 pF
f = 10 kHz
∆B = 5 mT
1
Output fall time
tf
–
–
0.5
µs
Delay time3)
tdop
tdrp
tdop - tdrp
RC
–
–
–
–
–
0
25
10
15
µs
µs
µs
32
40
48
kΩ
25 °C ± 2 °C
1
Filter sensitivity to
∆B
SC
–
–4
–
mV/
mT
–
1
Filter bias voltage
VC
0.8
–
2.2
V
∆B = 0
1
Frequency
f
4)
–
20000 Hz
∆B = 5 mT
2
Resistivity against
mechanical stress
(piezo)
∆ Bm
∆BHy
– 0.1
– 0.1
–
0.1
0.1
F=2N
25)
Filter input
resistance
1)
mT
mT
2
Leakage currents at pin 4 should be avoided. The bias shift of Bm caused by a leakage current IL can be
I L × RC ( T )
calculated by:∆ B m = ------------------------------ .
SC ( T )
2)
For higher ∆B the values may exceed the limits like following | ∆Bm | < | 0.05 × ∆B |
3)
For definition see page 16.
4)
1
Depends on filter capacitor CF. The cut-off frequency is given by f = ---------------------------------- . The switching points are
2π × R C × C F
guaranteed over the whole frequency range, but amplitude modification and phase shift due to the 1st order
highpass filter have to be taken into account.
5)
See page 17.
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
2000-07-01
TLE 4921-3U
RP
ΙS
V SZ
300 Ω
1
VS
VLD
RL
Ι Q , Ι QR
1)
ΙC
VS
4
C
Q
2
4.7 nF
1)
RC =
V QSat , V QZ
GND
3
VC
∆VC
∆Ι C
Figure 3
CL
AES01696
Test Circuit 1
1
VS
4
VS
C
Q
CF
470 nF
1 kΩ
GND
3
2
VQ
f min
f max
∆ B OP
∆ B Hy
AES01258
Figure 4
Data Sheet
Test Circuit 2
8
2000-07-01
TLE 4921-3U
Application Configurations
Two possible applications are shown in Figure 7 and 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 × 5 mm × 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 centered distance
of Hall probes
b Hall probes to
IC surface
L IC surface to
tooth wheel
N
S
b
L
a
a = 2.5 mm
b = 0.3 mm
AEA01259
Figure 5
Sensor Spacing
Conversion DIN – ASA
T
m = 25.4 mm/p
T = 25.4 mm CP
d
AEA01260
DIN
ASA
d
diameter (mm)
p
diameter pitch p
z
number of teeth
PD
pitch diameter PD = z/p (inch)
m
module m = d/z (mm)
CP
circular pitch
T
pitch T = π × m (mm)
Figure 6
Data Sheet
= z/d (inch)
CP = 1 inch × π/p
Toothed Wheel Dimensions
9
2000-07-01
TLE 4921-3U
Gear Wheel
Hall Sensor 1
Hall Sensor 2
Signal
Processing
S (N)
Circuitry
Permanent Magnet
N (S)
Figure 7
AEA01261
TLE 4921-3U, with Ferromagnetic Toothed Wheel
Magnet Wheel
S
S
N
Hall Sensor 1
Hall Sensor 2
Signal
Processing
AEA01262
Circuitry
Figure 8
Data Sheet
TLE 4921-3U, with Magnet Wheel
10
2000-07-01
TLE 4921-3U
Two-wire-application
Line
1
VS
4
C
VS
RL
Q
2
GND
3
CF
470 nF
VSIGNAL
RS
Sensor
Mainframe
for example : R L = 330 Ω
R S = 120 Ω
AES01263
Three-wire-application
Rp
4
CF
470 nF
1
VS
C
Q
2
GND
3
VSIGNAL
4.7 nF
4.7 nF
Mainframe
for example : R L = 330 Ω
R P = 0 ... 330 Ω
Data Sheet
VS
RL
Sensor
Figure 9
Line
AES01264
Application Circuits
11
2000-07-01
TLE 4921-3U
N (S)
S (N)
1
4
B1
B2
Wheel Profile
Missing Tooth
Small Airgap
Magnetic Field Difference
∆ B = B2-B1
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 > ∆ B RP switches the output OFF (VQ = HIGH)
∆ B RP = ∆ BOP + ∆ B 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
2000-07-01
TLE 4921-3U
Quiescent Current versus
Temperature
Quiescent Current versus
Supply Voltage
AED01698
10.0
ΙS
mA
Ι Q ON = 40 mA
7.5
Ι S ON
AED01699
10.0
ΙS
Ι Q ON = 40 mA
mA
7.5
Ι S ON
Ι S OFF
5.0
5.0
2.5
2.5
Ι S OFF
Ι S diff
0
0
5
10
15
0
-50
25
V
0
50
100
VS
˚C
200
Ta
Quiescent Current Difference
versus Temperature
Quiescent Current versus
Output Current
AED01700
1.0
AED01701
10.0
ΙS
∆Ι S
Ι Q ON = 40 mA
mA
mA
VS = 12 V
7.5
0.75
Ι S ON
Ι S ON - Ι S OFF
0.5
5.0
0.25
2.5
0
0
5
10
15
0
25
V
10
20
30
mA
50
ΙQ
VS
Data Sheet
0
13
2000-07-01
TLE 4921-3U
Saturation Voltage versus Temperature
Saturation Voltage versus Output
Current
AED01702
0.4
VQ
VQ
VS = 4.5 V
Ι Q = 50 mA
V
AED01703
0.3
V
Ta = 25 ˚C
0.2
0.3
0.1
0
0.2
-0.1
-0.2
0.1
-0.3
0
-50
0
50
100
˚C
-0.4
-50
200
-30
-10
10
30 mA 50
ΙQ
Ta
Saturation Voltage versus Supply
Voltage
Switching Points versus Preinduction
AED01704
0.4
VQ
Ι Q = 40 mA
Ta = 25 ˚C
V
AED01705
2.0
mT
BRP, (-B OP )
0.3
0.2
-80 mT < ∆B < 80 mT
1.5
1.0
typ
0.1
0
0.5
0
5
10
15
V
0
-500
25
VS
Data Sheet
-250
0
500
mT
BO
14
2000-07-01
TLE 4921-3U
Switching Induction versus
Temperature
AED01706
2
Bm
B HY
typ
1.5
min
-1
0
50
max
2.5
typ
0
B HY = B RP - B OP
f = 200 Hz
mT
max
1
AED01707
3.5
B m = ( B OP + B RP ) /2
f = 200 Hz
mT
-2
-50
Hysteresis versus Temperature
min
0.5
100
˚C
0
-50
200
0
50
100
Minimum Switching Field versus
Frequency
Minimum Switching Field versus
Frequency
AED01708
B min mT
200
Ta
Ta
3.0
˚C
AED01709
3.5
B min
C = 940 nF
2.5
mT
3.0
C = 940 nF
2.5
2.0
2.0
1.5
1.5
1.0
0.5
0
0.001
0.01
Ta = 170 ˚C
Ta = -40 ˚C
1.0
Ta = 25 ˚C
0.5
0.1
1
kHz
0
0.001
100
0.01
0.1
1
kHz
100
f
f
Data Sheet
Ta = 150 ˚C
15
2000-07-01
TLE 4921-3U
Delay Time1) between Switching Threshold
∆B and Falling Edge of VQ at Tj = 25 °C
Delay Time1) between Switching Threshold
∆B and Rising Edge of VQ at Tj = 25 °C
AED01711
30
AED01710
30
t drp µs
t dop µs
BOP
t drp
25
t dop
25
B RP
20
20
15
15
∆ B = 1.2 mT
∆ B = 1.2 mT
10
10
∆ B = 5 mT
5
5
0
0
5
0
10
15
kHz
25
∆ B = 5 mT
5
0
10
15
kHz
f
f
1)
1)
Delay Time versus Differential Field
Delay Time versus Temperature
AED01712
30
t d µs
25
AED01713
30
t d µs
f = 10 kHz
25
25
20
20
f = 10 kHz
∆ B = 2 mT
t d op
15
15
10
10
t d rp
t d op
5
0
5
t d rp
0
20
40
60
mT
0
-50
100
∆B
1)
0
50
100
˚C
200
Ta
Switching points related to initial measurement
@∆B = 2 mT, f = 200 Hz
Data Sheet
16
2000-07-01
TLE 4921-3U
Rise and Fall Time versus Temperature
t
Rise and Fall Time versus Output
Current
AED01714
100
ns
90
AED01715
120
t
Ι Q = 40 mA
ns
Ta = 25 ˚C
100
80
70
80
60
50
60
tf
40
tr
tr
40
30
tf
20
20
10
0
-50
0
50
100
˚C
0
200
0
10
20
30
mA
ΙQ
Ta
Capacitor Voltage versus Temperature
VC
Switching Thresholds versus
Mechanical Stress
AED01716
3.0
50
AED01717
1.0
V
F
mT
2.5
r = 0.5
∆ B RP ,(− ∆ B OP )
0.9
2.0
typ
1.5
0.8
max
min
0.7
1.0
0.6
0.5
0
-50
0
50
100
˚C
0.5
200
Ta
Data Sheet
0
1
2
3
5
N
F
17
2000-07-01
TLE 4921-3U
Filter Sensitivity versus Temperature
Filter Input Resistance versus
Temperature
AED01718
-5
S C mV
mT
RC
AED01719
2
R C (25 ˚C)
VS = 12 V
-4
1.5
typ
max
-3
min
1
-2
0.5
-1
0
-50
0
50
100
˚C
0
-50
200
Ta
0
50
100
˚C
200
Ta
Delay Time for Power on (VS Switching
from 0 V to 4.5 V) tpon versus Temp.
AED02646
0.35
k ms
nF
0.30
0.25
max
0.20
min
0.15
0.10
0.05
0
-50
0
50
100
C
200
Ta
Data Sheet
18
2000-07-01
TLE 4921-3U
Package Outlines
5.38 ±0.05
5.16 ±0.08
12.7 ±1
0.2
1x45˚
1 -0.1
0.25 ±0.05
0.2 +0.1
0.6 max.
9 +0.75
-0.5
1.27
3.81
1 -1
4
6 ±0.5
1
23.8 ±0.5
38 max.
0.4 +0.05
18 ±0.5
(0.25)
3.38 ±0.06
3.71 ±0.08
1 max.
1.9 max.
0.15 max.
P-SSO-4-1
(Plastic Single Small Outline Package)
0.25 -0.15
Adhesive Tape
6.35 ±0.4
12.7 ±0.3
4 ±0.3
0.5 ±0.1
GPO05357
Tape
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”.
Data Sheet
19
Dimensions in mm
2000-07-01