TLE4990

Programmable Linear Hall Sensor

Functional Description

Data Sheet

7

V 2.4, 2005-11

General

The linear Hall IC TLE4990 has been designed specifically to meet the demands of

highly accurate rotation and position detection, as well as for current measurement

applications.

The sensor provides a ratiometric analog output voltage which is ideally suited for A/D

conversion with the supply voltage as a reference.

The IC is produced in BiCMOS technology with high voltage capability and also providing

reverse polarity protection.

Zero-field Output Voltage (

The output voltage with no magnetic field present is called the zero field voltage

It is programmable within the range of 3% to 19% of

60% of

Magnetic Sensitivity (S)

The magnetic sensitivity is set in two steps: First the “coarse gain” is selected out of 8

values (3 PRE bits). Then the “fine gain” is adjusted by another 10 GDAC bits.

The resulting range of sensitivity extends from 15 mV/mT to 180 mV/mT at the nominal

supply voltage of 5 V. Note that as the sensitivity is ratiometric, it will also depend linearly

on the supply voltage.

The sensitivity of the -E6782 version is programmed during production.

It is calibrated to a value of 20 mV/mT at the nominal supply voltage of 5 V.

Temperature Gain Compensation

The temperature compensation of the sensitivity is programmed during production.

The value of +350 ppm/°C to provides an excellent accuracy for the use of a SmCo

permanent magnet. Stability is achieved by the dynamic offset cancellation technique to

eliminate any spurious mechanical or temperature effects.

Clamping Option

It is possible to reduce the output voltage swing from its original 3%... 97%

limited swing of 10% ... 90%

broken wire. In this case the output voltage is tied to

Note: The -E6782 version has this feature disabled.