iC-MN 25-BIT NONIUS ENCODER
WITH 3-CH. SAMPLING 13-BIT Sin/D INTERPOLATION
Rev D1, Page 34/59
S/D CONVERSION with DIRECT OUTPUT
iC-MN functions as a simultaneous sampling, 3- Op. Mode Descriptions Of Direct Output Modes
channel sine-to-digital converter when the multiturn
modes are selected with deactivated synchronization.
When SBL_S = 0 and SBL_N = 0 no track synchro- MODE_ST Code 0x0C
nization takes place; the data from all three tracks is The processing time is largely determined by the sum
queued up for output without any further processing.
of the conversion time of the configured tracks. The
conversion procedure is as follows:
1. A data readout request triggers the complete
conversion of the set tracks
2. 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 (NB: The data
from the first readout is invalid following a SOFT_RES).
The conversion procedure is as follows:
Figure 13: Principle of simultaneous sampling, 3-
channel S/D conversion with direct data
output
1. With a data readout: immediate transmission of
the data from the last readout cycle
MODE_ST
Addr. 0x3D; bit 7:4
2. With a data readout: start of a new conversion
and providing of data for the next readout cycle.
Direct output via MT modes with deactivated
synchronization
Code
Description
Data output following S/D conversion of all tracks;
synchronization disabled (SBL_x = 0)
MODE_ST Code 0x0E
0x0C
The processing time is low and the time of sampling
not precisely known. The conversion procedure is as
follows:
Data output: result of previously triggered S/D
conversion;
0x0D
0x0E
synchronization disabled (SBL_x = 0)
Data output: last result of background S/D
conversion (asynchronous);
1. Regardless of the data readout: permanent
background conversion
synchronization disabled (SBL_x = 0)
Data output: last result of S/D conversion triggered
by pin T3;
2. With a data readout: transmission of current
data.
0x0F
synchronization disabled (SBL_x = 0)
Notes
On changing parameter MODE_ST during
operation command SOFT_RES should be issued.
MODE_ST Code 0x0F
This mode can be used especially for resolver sys-
tems, in which 1 to 3 channels need to be sampled in
synchronism with a specific carrier frequency. An ex-
ternal trigger signal supplied to pin T3 takes over the
sampling control and thus decouples it from the data
readout timing. The conversion procedure is as fol-
lows:
Table 48: MT modes used for direct output
1. A conversion is triggered by pin T3
2. With a data readout the most recent output data
triggered by pin T3 is transmitted.
ICHAUS [ IC-HAUS GMBH ]
