IC-MACHIP datasheet(2/18 Pages) ICHAUS

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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.

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