DYNAMIC DIFFERENTIAL HAL  EFFECT SENSOR IC WITH  DIGITAL SIGNAL OUTPUT

DESCRIPTION

The differential Hall Effect sensor UTC  UH4921 providesa

superior stability and a high sensitivity over temperature and

symmetrical thresholds in order to achieve a stable duty cycle. The

integrated circuit provides a digital signal output with frequency

proportional to the speed of rotation. Unlike other rotational sensors

differential Hall ICs are not influenced by radial vibration within the

effective airgap of the sensor and require no external signal

processing.

UTC  UH4921 is particularly suitable for rotational speed

detection and timing applications of ferromagnetic toothed wheels

such as anti-lock braking systems, transmissions, crankshafts, etc.

FEATURES

* Digital output signal

* Low cut-off frequency

* High sensitivity

* Symmetrical thresholds

* Reduced power consumption

* AC coupled

* Output protection against electrical disturbances

* Large temperature range

* Large airgap

* Protection against overvoltage

* Protection against reversed polarity

* Two-wire and three-wire configuration possible

* Advanced performance

* South and north pole pre-induction possible

* High piezo resistivity