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IC-MN Datasheet, PDF (47/59 Pages) IC-Haus GmbH – 25-BIT NONIUS ENCODER WITH 3-CH. SAMPLING 13-BIT Sin/D INTERPOLATION | |||
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iC-MN 25-BIT NONIUS ENCODER
WITH 3-CH. SAMPLING 13-BIT Sin/D INTERPOLATION
SBL_MT
Code
00
01
10
11
Addr. 0x41; bit 1:0
MT synchronization bit Synchronization range
length
(ST resolution)
1 bit
± 90°
2 bit
± 90°
3 bit
± 135°
4 bit
± 157.5°
Table 85: MT synchronization bit length
LNT_MT
Code
0
1
Addr. 0x41; bit 2
Function (single sync. bit, SBL_MT = 0x00)
Trailing
Leading
Table 86: Leading/trailing gear box assembly
Rev D1, Page 47/59
further readouts are attempted and MT_ERR remains
permanently set.
startup
sequence with
16 ms timeout
read external
multiturn
serial-communication error?
yes
no
mt-error-counter ++
yes
mt_error-counter < 4
no
set MT_ERR
Via CHK_MT the device can be conï¬gured so that the
counted multiturn period is veriï¬ed every 8 ms. An
error in the multiturn check (the comparison of the
counted multiturn period and the external multiturn po-
sition data) is signaled via the error bit (MT_CTR is set
in the status register, see page 43).
CHK_MT
Code
0
1
Addr. 0x40; bit 6
Function
Veriï¬cation disabled
Cyclic veriï¬cation each 8 ms
Table 87: Period counter veriï¬cation
sync to flashcounter
proceed with
startup-sequence
proceed with
startup-sequence
no further multiturn-readouts
started
Figure 20: Error handling during start up phase
normal operation:
ready for
sensordata-requests
CHK_MT?
yes
start timer
GRAY_MT
Code
0
1
Addr. 0x41; bit 3
Data format
Binary coded
Gray coded
Table 88: MT Interface data format
Error Handling
If a communication error appears when reading in ex-
ternal multiturn data during the startup phase (such
as pin MTSLI reading a permanent logic 0 or the exter-
nal MT sensor not responding), the ï¬rst conversion and
request for the external multiturn data are repeated up
to three times (see Figure 20). If the error persists after
a fourth attempted readin, the device goes into normal
operating mode. Conversion requests for the single-
turn position data are possible, but MT_ERR remains
permanently set.
The error handling in normal operating mode when
the multiturn data veriï¬cation is activated is shown in
Figure 21. If there is an error in communication no
timer == 8 ms?
yes
read external
multiturn
sync to flashcounter
and compare to counted
no
multiturn-value
serial
communication
error?
no
compare-error?
yes
yes
set MT_CTR
set MT_ERR
Figure 21: Error handling during normal operation
with cyclic period counter veriï¬cation
MTMA
MTSLI
MSB
LSB
DL_MT + SBL_MT
tout
Figure 22: Line signals of the serial MT interface
MODE_MT = 0x10 (SSI)
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