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