TLE4990 Datasheet, PDF (7/24 Pages) Infineon Technologies AG – Programmable Linear Output Hall Sensor

TLE4990
Programmable Linear Hall Sensor
Functional Description
Block Diagram
Figure 2 shows a simplified block diagram.
OTPROM/RAM
Temperature
Linearization
Interface
Zero magnetic
field voltage
Chopped
Hallprobe
Modulator
Gain
Demodulator
+
Sample &
Hold
Out
Clamping
Amplifier,
Buffer
Clock
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 V_DD or GND in case of
errors.
Data Sheet
7
V 2.0, 2004-05