IC-MU_13 Datasheet, PDF (43/59 Pages) IC-Haus GmbH – OFF-AXIS NONIUS ENCODER WITH INTEGRATED HALL SENSORS

iC-MU OFF-AXIS NONIUS ENCODER
WITH INTEGRATED HALL SENSORS
preliminary
Rev B1, Page 43/59
Index pulse Z can be programmed in four lengths. The
position of the index pulse in relation to the A/B signals
is shown in Figure 41.
LENZ(1:0)
Code
0x0
0x1
0x2
0x3
Addr. 0x16; bit 7:6
Z-pulse length
90°
180°
270°
360°
Table 71: Index pulse length
A
B
Z 360°
Z 270°
Z 180°
Z 90°
-2 -1 0 1 2 3 4
Figure 41: Index pulse length settings
The direction of rotation can be inverted with parame-
ter ROT. The parameter affects the output of the data
word through the serial interface in MODE_ST=0x0
and 0x1, the ABZ-interface and the UVW-interface.
ROT
Code
0
1
Addr. 0x15; bit 7
Description
no inversion of direction of rotation
inversion of rotation
Table 72: Inverted direction of rotation
Parameter SS_AB must be configured depending on
the maximum speed. With a filter setting of FILT =
0x00 (Table 47), correspondingly higher SS_AB step
size values must be programmed. The maximum pos-
sible resolution of the incremental count signal is re-
duced according to the set step size. The FRQ_ABZ
status bit is set in the case of an unacceptable high
speed.
The minimum edge distance t_mtd of the ABZ,
STEP/DIR or CW/CCW interface can be limited by set-
ting the maximum output frequency with FRQAB. It can
be used to adjust the output frequency to a frequency
limit given by an external ABZ, STEP/DIR or CW/CCW
counter device.
FRQAB(2:0)
Addr. 0x15; bit 2:0
Code
Output frequency AB
Edge distance t_mtd
0x0
6.25 MHz
40 ns
0x1
3.13 MHz
80 ns
0x2
1.56 MHz
160 ns
0x3
781.25 kHz
320 ns
0x4
390.63 kHz
640 ns
0x5
195.31 kHz
1.28 µs
0x6
48.83 kHz
5.12 µs
0x7
12.2 kHz
20.48 µs
Table 74: AB output frequency
The incremental counter has an integrated hysteresis
which prevents multiple switching of the incremental
signals at the reversing point. Hysteresis ϕ_hys must
first be exceeded before edges can again be gener-
ated at A or B. This hysteresis can be set within a range
of 0° to 0.35° according to Table 75 and is referenced
to 360° of a singleturn cycle.
CHYS_AB(1:0) Addr. 0x16; bit 5:4
Code
Hysteresis
0x0
no hysteresis
0x1
0.175°
0x2
0.35°
0x3
0.7°
Table 75: Hysteresis with an inverted direction of rota-
tion
The parameter ENIF_AUTO selects whether at startup
the incremental interface is enabled after the converter
has found its operating point or if the counting to the
absolute angle can be seen at the incremental inter-
face.
ENIF_AUTO
Addr. 0x15; bit 4
Code
Description
0
counting to operating point visible
1
counting to operating point not visible
SS_AB(1:0)
Addr. 0x15; bit 5:4
Code
max. resolution
max. rpm
0x0
2¹⁸
6000 rpm
0x1
2¹⁷
12000 rpm
0x2
2¹⁶
6000 rpm mit FILT=0x0
0x3
2¹⁵
12000 rpm mit FILT=0x0
Table 76: Incremental interface enable
See the chapter on the preset function (p. 56) to set
the offset for ABZ output.
Table 73: System AB step size