IC-MHL200 Datasheet, PDF (21/33 Pages) IC-Haus GmbH – 12-BIT LINEAR / ROTARY POSITION HALL ENCODER

iC-MHL200
12-BIT LINEAR / ROTARY POSITION HALL ENCODER
Rev C1, Page 21/33
brated using the incremental signals or the values read
out serially. In order to achieve a clear relationship be-
tween the calibration parameters which have an effect
on the analog sensor signals and the digital sensor val-
ues derived from these, the position of the zero pulse
should be set to ZPOS = 0 so that the digital signal
starting point matches that of the analog signals.
At an incremental resolution of 8 edges per revolution
(CFGRES = 0x1) those angle values can be displayed
at which calibration parameters VOSS, VOSC and GCC
demonstrate their greatest effect. When rotating the
magnet at a constant angular speed the incremental
signals shown in Figure 20 are achieved, with which
the individual edges ideally succeed one another at a
temporal distance of an eighth of a cycle (a 45 ° angle
distance). Alternatively, the angle position of the mag-
net can also be determined using a reference encoder,
rendering an even rotational action unnecessary and
allowing calibration to be performed using the available
set angle values .
tions of 0 ° and 180 °) at signal A should be exactly half
a period (PER). Should the edges deviate from this in
distance, the offset of the sine channel can be adjusted
using VOSS. The same applies to the falling edges of
the A signal which should also have a distance of half
a period; deviations can be calibrated using the offset
of cosine parameter VOSC. With parameter GCC the
distance between the neighboring flanks of signals A
and B can then be adjusted to the exact value of an
eighth of a cycle (a 45 ° angle distance).
The various possible effects of parameters VOSS,
VOSC and GCC on the flank position of incremental
signals A and B are shown in Figure 20. Ideally, the
distance of the rising edge (equivalent to angle posi-
Figure 20: Calibration using incremental signals