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