IC-MN_16 Datasheet, PDF (33/62 Pages) IC-Haus GmbH – 25-BIT NONIUS ENCODER WITH 3-CH. SAMPLING 13-BIT Sin/D INTERPOLATION

iC-MN 25-BIT NONIUS ENCODER
WITH 3-CH. SAMPLING 13-BIT Sin/D INTERPOLATION
S/D CONVERSION with MULTITURN SYNCHRONIZATION
Rev F2, Page 33/62
In multiturn modes the output data word always
matches the current converted and synchronized track
data. For 1 to 3 selected tracks parameters SBL_S and
SBL_N adjust the gear box synchronization, whereas
the selected used bit lengths (UBL_x) determine the
reduction ratio required for the multiturn gear box:
Synchronization
Gear reduction
Master track ↔ Singleturn
2^UBL_M
Segment track ↔ Master track 2^UBL_S
Nonius track ↔ Segment track 2^UBL_N
One limitation in multiturn mode is that neither an exter-
nal multiturn can be configured nor counted multiturn
data output. Parameters MODE_MT and M2S must be
set to 0. Figure 12 shows the synchronization principle,
where φ represents the digitized angle of the relevant
track.
Description Of Multiturn Operating Modes
MODE_ST Code 0x0C
The processing time is largely determined by the sum of
the conversion time of the configured tracks. Procedure
of conversion:
1. A data readout request triggers the complete con-
version of the set tracks
2. Gear box synchronization
3. Transmission of the output data
MODE_ST Code 0x0D
The processing time is low as ”old” data is transmitted,
the time of sampling is, however, known. The conver-
sion procedure is as follows:
1. With a data readout: immediate transmission of
the data from the last readout cycle
2. With a data readout: start of a new conversion
and providing of data for the next readout cycle.
Note: The data from the first readout is invalid follow-
ing a SOFT_RES.
Figure 12: Principle of multiturn synchronisation
MODE_ST
Addr. 0x3D; bit 7:4
Operation modes with multiturn synchronization (MT Modes)
Code
Description
Data output following S/D conversion of all tracks
0x0C
with MT synchronization configured via SBL_x
Data output: result of previously triggered S/D
conversion
0x0D
with MT synchronization configured via SBL_x
Data output: last result of background S/D
conversion (asynchronous)
0x0E
with MT synchronization configured via SBL_x
Data output: last result of S/D conversion triggered
by pin T3
0x0F
with MT synchronization configured via SBL_x
Notes
On changing parameter MODE_ST during operation
command SOFT_RES should be issued.
Table 47: Multiturn modes
MODE_ST Code 0x0E
The processing time is low and the time of sampling
not precisely known. The conversion procedure is as
follows:
1. Regardless of the data readout: permanent back-
ground conversion
2. With a data readout: transmission of current data.
MODE_ST Code 0x0F
This mode can be used in systems which require that
asynchronous sampling is independent of the data read-
out timing. The sampling will be started with a rising
edge at pin T3. The conversion procedure is as follows:
1. A conversion is triggered via a rising edge at pin
T3, if applicable with gear box code synchroniza-
tion.
2. With a data readout the most recent output data
triggered by pin T3 is transmitted.