iC-MA
ANGULAR HALL SENSOR / ENCODER
Rev B3, Page 9/18
Definition of the angle of rotation and the direction of rotation
The arrangement of permanent magnet and iC-MA il-
lustrated in Figure 5, where the diametrically magne-
tized magnet is placed vertical to the chip’s surface, is
used to determine both the angle
ω
and direction of ro-
tation. An angle of 0° lies along the diagonal. Rotating
the magnet clockwise as shown in Figure 5 increases
the angular position and hence the output signal.
N
S
N
S
0°
Figure 5: Definition of the angle and direction of ro-
tation
Programming the configuration
iC-MA has 28 modes of operation (see tables on the
following pages). After the device has been switched
on or "woken up" from standby mode by a low sig-
nal at pin NEN the levels at the configuration inputs
CFG1 to CFG3 are assessed. These three-level in-
puts can be connected to GND (low), left open (open)
or connected to VDD (high). For correct identification,
a setup time of at least tp(CFGx) = 4 µs must be main-
tained between programming the configuration and ac-
tivating the device. While the device is active changes
in signal at the configuration inputs are ignored.
If several iC-MAs are connected in series in chain op-
eration (see the description of functions on page 13)
it must be ensured that the NEN input of the devices
is switched to
low
during the various clock cycles and
that the programming default does thus not lie within
the active phase of the devices.
In standby all ports are switched to tristate, i.e. high
impedance. Only in chain operation modes port D is
active
high
so that the devices arranged further behind
can also be deactivated.
4V
VDD
NEN
iC-MA active
CFGx
iC-MA active
td(VDD)on
tp(CFGx)
tp(CFGx)
Figure 6: Programming the configuration
ICHAUS [ IC-HAUS GMBH ]
