Siemens TLE4945L, TLE4935L, TLE4935-2L, TLE4905L Datasheet
Uni- and Bipolar Hall IC Switches for
Magnetic Field Applications
Features
• Temperature compensated magnetic performance
• Digital output signal
• For unipolar and alternating magnetic fields
• Large temperature range
• Protection against reversed polarity
• Output protection against electrical disturbances
Type Ordering Code Package
TLE 4905 L; TLE 4935 L;
TLE 4935-2 L; TLE 4945 L;
P-SSO-3-2
TLE 4945-2L
Bipolar IC
TLE 4905 L Q67006-A9120 P-SSO-3-2
TLE 4935 L Q67006-A9112 P-SSO-3-2
TLE 4935-2 L Q67006-A9143 P-SSO-3-2
TLE 4945 L Q67006-A9163 P-SSO-3-2
TLE 4945-2L on request P-SSO-3-2
TLE 4905/35/35-2/45 L (Unipolar/Bipolar Magnetic Field Switches) have been designed
specifically for automotive and industrial applications. Reverse polarity protection is
included on-chip as is output protection against negative voltage transients.
Typical applications are position/proximity indicators, brushless DC motor commutation,
rotational indexing etc.
Semiconductor Group 1 1997-09-01
Pin Configuration
(view on branded side of component)
±0.15
1.35
TLE 4905 L; TLE 4935 L;
TLE 4935-2 L; TLE 4945 L; TLE 4945-2L
Center of
sensitive area
2.08
±0.15
231
Figure 1
Pin Definitions and Functions
Pin No. Symbol Function
1
V
S
Supply voltage
2 GND Ground
3
Q
Output
V
GND
S
Q
AEP01364
Semiconductor Group 2 1997-09-01
TLE 4905 L; TLE 4935 L;
TLE 4935-2 L; TLE 4945 L; TLE 4945-2L
Circuit Description
The circuit includes Hall generator, amplifier and Schmitt-Trigger on one chip. The
internal reference provides the supply voltage for the components. A magnetic field
perpendicular to the chip surface induces a voltage at the hall probe. This voltage is
amplified and switches a Schmitt-trigger with open-collector output. A protection diode
against reverse power supply is integrated. The output is protected against electrical
disturbances.
Threshold
Generator
V
S
Figure 2
Block Diagram
1
Hall-
Generator
V
S
V
Ref
Amplifier
2
GND
Schmitt-
Trigger
Output
Stage
3
AEB01243
Q
Semiconductor Group 3 1997-09-01
TLE 4905 L; TLE 4935 L;
TLE 4935-2 L; TLE 4945 L; TLE 4945-2L
Functional Description Unipolar Type TLE 4905 (figure 3 and 4)
When a positive magnetic field is applied in the indicated direction (figure 3) and the
B
turn-on magnetic induction
(Operate Point). When the current is reduced, the output of the IC turns off (Release
Point; figure 4).
Ι
is exceeded, the output of the Hall-effect IC will conduct
OP
+
Branded Side
S
V
N
Q
Figure 3
Sensor/Magnetic-Field Configuration
B
B
OP
B
0
V
Q
V
RP
QH
+
-
V
S
Induction
t
Output Voltage
AES01231
V
QL
t
AED01420
Figure 4
Switching Characteristics Unipolar Type
Semiconductor Group 4 1997-09-01
TLE 4905 L; TLE 4935 L;
TLE 4935-2 L; TLE 4945 L; TLE 4945-2L
Functional Description Bipolar Type TLE 4935/35-2/45 (figure 5 and 6)
When a positive magnetic field is applied in the indicated direction (figure 5) and the
B
turn-on magnetic induction
(Operate Point). When a reverse magnetic field is generated, the output of the IC turns
off (Release Point; figure 6).
Ι
is exceeded, the output of the Hall-effect IC will conduct
OP
+
Branded Side
S
V
N
Q
Figure 5
Sensor/Magnetic-Field Configuration
B
B
OP
0
V
Q
V
+
B
RP
QH
-
V
S
t
AES01231
Induction
Output Voltage
V
QL
t
AED01421
Figure 6
Switching Characteristics Bipolar Type
Semiconductor Group 5 1997-09-01
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