IC-PV Datasheet, PDF (12/28 Pages) IC-Haus GmbH – BATTERY-BUFFERED HALL MULTITURN ENCODER

iC-PV
BATTERY-BUFFERED HALL MULTITURN ENCODER
Rev E2, Page 12/28
S
Figure 6: Pattern of analog sensor signals with cor-
responding angle of rotation
Figure 5: Magnet zero position (top view)
HALL SENSOR CONDITIONING: ANGLE OFFSET AND CODE DIRECTION
Assembled together with a diametrically polarized
magnet, the integrated Hall sensor signal processing
generates a 3 bit position word. Therefore, the iC-PV
can deliver up to 3 synchronization bits to the singleturn
sensor in SSI readout mode.
OS
Code
000
001
010
011
100
101
110
111
Addr. 0x01; bit 7:5
Phase shift
0 °, no shift
+45 ° leading
+90 ° leading
+135 ° leading
-180 ° leading or trailing
-135 ° trailing
-90 ° trailing
-45 ° trailing
Table 6: Angle offset
When the phase relationship between an additional
singleturn iC and the iC-PV as multiturn encoder is
unknown, or the singleturn sensor takes care of the
synchronization (SSI mode) and expects a defined re-
lationship, the position can be electrically manipulated
to achieve the desired (leading or trailing) phase shift,
regardless of the actual mounting position. An offset
value is added to the digitized Hall sensor position ac-
cording to parameter OS.
In applications where the chain operation mode is used
(see Page 14), the iC-PV takes care of synchronization.
Therefore, it has to be mounted leading in relation to
the singleturn iC. The OS parameter can be used to
achieve this phase shift on random mounting displace-
ments. To ensure correct synchronization of multiturn
and singleturn data, the resulting phase shift between
multiturn and singleturn position must be in range 0 ° to
180 ° (MT leading).
Note: 0 ° to 180 ° is the ideal range for tolerated val-
ues of phase shift between ST and MT. This range is
further reduced due to communication, propagation or
processing delays for the specific application. Typically,
it is reduced by few degrees, increasing with rotational
velocity.
DIR
Code
0
1
Addr. 0x00; bit 3
Direction
Normal
Inverted
Table 7: Code direction
For assembly situations were the mounting direction of
the magnet is not known, the counting direction can be
easily swapped with the configuration bit DIR. The bit
would be typically used to invert the counting directions
in applications where the iC-PV is assembled on the
back side of a PCB.