IC-MU_13 Datasheet, PDF (39/59 Pages) IC-Haus GmbH – OFF-AXIS NONIUS ENCODER WITH INTEGRATED HALL SENSORS

iC-MU OFF-AXIS NONIUS ENCODER
WITH INTEGRATED HALL SENSORS
preliminary
The direction of rotation of the read multiturn data can
be inverted using parameter ROT_MT.
ROT_MT
Code
0
1
Addr. 0x0E; bit 5
Function
no inversion of direction of rotation
inversion of direction of rotation
Table 58: Inverted direction of rotation of external mul-
titurn
Rev B1, Page 39/59
1-18 bit
MODE_MT
1-4 bit
SBL_MT
SYNC BITS
read-in multiturn
invert bits according
to ROT_MT
+
SYNC BITS
ROT_MT
SPO_MT
multiturn to be
synchronized to
internal singleturn
synchronisation unit
The parameter ESSI_MT configures the evaluation of
an optional error-bit send by the external multiturn de-
vice.
multiturn
singleturn value
ESSI_MT
Code
0x0
0x1
0x2
0x3
Addr. 0x0E; bit 7:6
Function
no error bit
1 error-bit low active
reserved
1 error-bit high active
Table 59: Evaluation of an error-bit of the external mul-
titurn
Figure 36: Parameters to configure external multi-
turn
CHK_MT can be used to verify the counted multiturn
at regular intervals. Verification can also be requested
using command MT_VER. A multiturn verification error
(comparison of the internal counted multiturn cycles
with the external multiturn data) is signaled through the
status bit MT_CTR.
The total data length of the external read multiturn data
word is determined by:
CHK_MT
Code
0
1
Addr. 0x10; bit 6
Function
no verification
periodical verification
Table 61: Multiturn verification
data_length_ext_mt = Bits(MODE_MT) + Bits(SBL_MT) + Bits(ESSI_MT)
normal operation
The parameter SPO_MT allows to balance an existing
static offset between the singleturn and the multiturn.
The offset is added before the synchronization of the
read multiturn data (see Figure 36).
SPO_MT
Code
0x0
...
0xF
Addr. 0x0F; bit 7:4
Function
multiturn offset
Table 60: Offset of external multiturn
CHK_MT?
yes
read external
multiturn
no
serial comm. error
yes
reset
MT_ERR
set MT_ERR
reset
MT_CTR
sync to master track
and compare to counted
multiturn-value
no
compare error
yes
set MT_CTR
Figure 37: Error handling in normal operation with
cyclic verification of the period counter