<strong> Features
Two-wire current interfaceDynamic self-calibration principleSingle chip solutionNo external components neededHigh sensitivitySouth and north pole pre-induction possibleHigh resistance to piezo effects Large operating air-gapsWide operating temperature rangePSSO2-1 TLE 4941C: 1.8nF overmolded capacitorTypeTLE 4941TLE 4941CMarking4100E41C0EOrdering CodeQ62705-K427Q62705-K439PackagePSSO2-1PSSO2-2The Hall Effect sensor IC TLE4941 is designed to provide information aboutrotational speed to modern vehicle dynamics control systems and ABS. The outputhas been designed as a two wire current interface. The sensor operates withoutexternal components and combines a fast power-up time with a low cut-offfrequency. Excellent accuracy and sensitivity is specified for harsh automotiverequirements as a wide temperature range, high ESD and EMC robustness. State-of-the art BiCMOS technology is used for monolithic integration of the active sensorareas and the signal conditioning circuitry.
Finally, the optimised piezo compensation and the integrated dynamic offsetcompensation enable easy manufacturing and elimination of magnet offsets.
The TLE4941C is additionally provided with an overmolded 1.8nF capacitor forimproved EMI performance.
Functional Description
The differential hall sensor ON detects the motion of ferromagnetic and permanentmagnet structures by measuring the differential flux density of the magnetic field. Todetect the motion of ferromagnetic objects the magnetic field must be provided by aback biasing permanent magnet. Either south or north pole of the magnet can beattached to the rear unmarked side of the IC package.
Magnetic offsets of up to +/- 20mT and device offsets are cancelled by a self-calibration algorithm. Only a few transitions are necessary for self-calibration. Afterthe initial calibration sequence switching occurs when the input signal is crossing thearithmetic mean of its max and min value. (E.g. zero-crossing for sinusoidal signals)The IC and OFF state of the IC are indicated by High and Low currentconsumption.
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