iC-MA
ANGULAR HALL SENSOR / ENCODER
Rev B3, Page 2/18
DESCRIPTION
The CMOS device iC-MA consists of a quadruple hall zero angle is indicated by an index pulse. The maxi-
sensor array which has been optimized for the mag- mum resolution of 8-bit is maintained up to rotations
netic measurement of angles of rotation. This array of 60,000 rpm.
permits error-tolerant adjustment of the magnet, re-
ducing assembly efforts. The integrated signal condi- The absolute angle of rotation can be converted back
tioning unit provides a differential sine/cosine signal to a linear analog output signal using the internal D/A
at the output. The sensor generates one sine cycle converter; here, output voltage limits can be set as
per each full rotation of the magnet, enabling the an- required using the external pins. Either a periodic
gle to be clearly determined. At the same time the linear signal (sawtooth) or a delta voltage (triangle)
internal amplitude control unit produces an regulated can be provided. iC-MA can be easily cascaded in
output amplitude of 2Vpp regardless of variations in three different modes of chain operation so that sev-
the magnetic field strength, supply voltage and tem- eral axes of rotation can be scanned. The angle po-
perature. Furthermore, signals are provided which sitions of the individual axes can then be read via a
enable the sensor amplitude to be assessed and also common bus.
report any magnet loss.
Used in conjunction with a permanent magnet iC-
With the aid of the integrated 8-bit sine/digital con- MA can act as an encoder system with an integrated
verter the angle of rotation is determined from the magnetic scanning feature. No further components
sine/cosine signals. This is output via an incremental are required.
interface in a number of selectable resolutions. The
ICHAUS [ IC-HAUS GMBH ]
