DESCRIPTION
The CMOS device iC-MA consists of a quadruple Hall sensor array which has been optimized for the magnetic measurement of angles of rotation. This array permits error-tolerant adjustment of the magnet, reducing assembly efforts. The integrated signal conditioning unit provides a differential sine/cosine signal at the output. The sensor generates one sine cycle per each full rotation of the magnet, enabling the angle to be clearly determined. At the same time the internal amplitude control unit produces an regulated output amplitude of 2 Vpp regardless of variations in the magnetic field strength, supply voltage and temperature. Furthermore, signals are provided which enable the sensor amplitude to be assessed and also report any magnet loss.

FEATURES
♦ Quadruple Hall sensor array for error-tolerant adjustment
♦ Non-sensitive to magnetic stray fields due to differential
   measurement technique
♦ Interpolator with a resolution of up to 256 angle steps per cycle
♦ Rotational speeds up to 60 000 rpm
♦ 4 buffered I/O stages for signal outputs
♦ Three configuration inputs for operating mode selection
♦ Analog operation modes:
   - sine/cosine signals controlled to 2 Vpp
   - triangle or sawtooth signal with selectable amplitude
♦ Digital operation modes:
   - A/B quadrature signals with Z index pulse
   - Counter pulses for external binary counters
♦ Cascading of multiple iC-MA possible for chain operation
♦ Error signal output for detection of low magnetic field strength
♦ Additional operating modes with reduced power consumption
♦ Standby mode when not enabled
♦ Extended temperature range of -40...+125 °C

APPLICATIONS
♦ Analog and digital angle sensors
♦ Incremental angular encoders
♦ Magnetic multiturn encoders
♦ Potentiometer replacement
♦ Contactless rotary switch
♦ Commutation of brushless DC motors
♦ Flow meter