IC-MU_17 Datasheet, PDF (46/66 Pages) IC-Haus GmbH – MAGNETIC OFF-AXIS POSITION ENCODER - POLE WIDTH 1.28MM

iC-MU MAGNETIC OFF-AXIS
POSITION ENCODER - POLE WIDTH 1.28MM
Rev D1, Page 46/66
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 44.
LENZ(1:0)
Code
0x0
0x1
0x2
0x3
Addr. 0x16; bit 7:6
Z-pulse length
90°
180°
270°
360°
Table 76: Index pulse length
SS_AB(1:0)
Addr. 0x15; bit 5:4
Code max FILT max. rotation speed *)
res.
MPC = 0x4 MPC = 0x5
(16/15)
(32/31)
0x0
2¹⁸ 0x0
don’t use don’t use
≥ 0x1 6000 rpm 6000 rpm
0x1
2¹⁷ 0x0
don’t use 3000 rpm
≥ 0x1 12000 rpm 12000 rpm
0x2
2¹⁶ 0x0
6000 rpm 6000 rpm
≥ 0x1 24000 rpm 12000 rpm
0x3
2¹⁵ 0x0
12000 rpm 12000 rpm
≥ 0x1 24000 rpm 12000 rpm
Note: *) FRQAB = 0x0
MPC = 0x6
(64/63)
1500 rpm
6000 rpm
3000 rpm
6000 rpm
6000 rpm
6000 rpm
6000 rpm
6000 rpm
Table 78: System AB step size and limitation of rotation
frequency
A
B
Z 360°
Z 270°
Z 180°
Z 90°
-2 -1 0 1 2 3 4
Figure 44: Index pulse length settings
The minimum edge distance t_mtd of the ABZ, STEP/DIR
or CW/CCW interface can be limited by setting the max-
imum 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. The FRQ_ABZ status bit is set in the case of
an unacceptable high speed.
The direction of rotation can be inverted with parameter
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 code direction
inversion of code direction
Table 77: Inverted direction of rotation
FRQAB(2:0)
Addr. 0x15; bit 2:0
Code
0x0
Output frequency AB
6.25 MHz
Edge distance t_mtd
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 79: AB output frequency
Parameter SS_AB must be configured depending on
the maximum speed. With a filter setting of FILT = 0x00
(Table 51), correspondingly higher SS_AB step size
values must be programmed. The maximum possible
resolution of the incremental count signal is reduced
according to the set step size.
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 generated at
A or B. This hysteresis can be set within a range of 0°
to 0.35° according to Table 80 and is referenced to 360°
of a singleturn cycle.