TLE4990

Programmable Linear Hall Sensor

Functional Description

Data Sheet

7

V 2.0, 2004-05

Block Diagram

Figure 2 shows a simplified block diagram.

Figure 2

Block Diagram

Principle of Operation

• A magnetic flux is measured by a Hall-Effect cell.

• The Temperature compensation modulates the bias current of the hall cell.

• The output signal from the Hall-Effect cell is amplified.

• A zero field voltage is added.

• The output voltage range can be clamped by limiters.

• The final output value is amplified and buffered.

• The output voltage is proportional to the supply voltage (ratiometric bahaviour).

•An OBD (On Board Diagnistics) circuit connects the output to

errors.

OTPROM/RAM

Interface

Temperature

Linearization

Zero magnetic

field voltage

Clamping

Amplifier,

Buffer

Clock

Gain

Modulator

Chopped

Hallprobe

Sample &

Hold

Out

+

Demodulator