IC-MU_13 Datasheet, PDF (35/59 Pages) IC-Haus GmbH – OFF-AXIS NONIUS ENCODER WITH INTEGRATED HALL SENSORS

iC-MU OFF-AXIS NONIUS ENCODER
WITH INTEGRATED HALL SENSORS
preliminary
CONVERTER AND NONIUS CALCULATION
Rev B1, Page 35/59
Converter principle
The system consist of two real-time tracking convert-
ers, each with a resolution of 12 bits for the master
track and nonius track. Above the maximal permissi-
ble input frequency the status bits FRQ_CNV is set.
The tracking converter can’t follow the input signal any
more. With a filter setting of type FILT1 and bigger an
increased resolution of 14 bits is available.
A digital filter can be configured with FILT to reduce the
noise of the digital output signals. Using this the digital
angle values of the tracking converter can be filtered.
10 ms
1 ms
100 us
10 us
1 us
0.1 us
0.1 Hz
FILT6
FILT5
FILT4
FILT3
FILT2
FILT1
FILT0
1 Hz
10 Hz
100 Hz
frequency
1 kHz
Figure 29: Filter latencies
10 kHz
Synchronization mode
FILT
Code
0x0
0x1
0x2
0x3
0x4
0x5
0x6
Addr. 0x0E; bit 2:0
Typ
noise sup- latency
pression
FILT0
0 dB
< 1 µs
FILT1
15 dB
< 1 µs
FILT2
21 dB
2.5 µs
FILT3
27 dB
10 µs
FILT4
FILT5
FILT6
39 dB
45 dB
51 dB
164 µs f_sin < 50 Hz
25 µs f_sin < 1 kHz
650 µs f_sin < 12 Hz
33 µs f_sin < 1 kHz
2.6 ms f_sin < 3 Hz 41 µs
f_sin < 1 kHz
Table 47: Digital filter features
30
10
3
1
FILT6
FILT5 _FILT4
0.3
FILT3
FILT2
FILT1
FILT0
0.1
10^−1
10⁰
10¹
10²
10³
10⁴
sine frequency [Hz]
Figure 28: Phase relationship of the filters
Table 48 lists the configurable master period counts
and the resulting bit lengths for nonius synchroniza-
tion, and the synchronization bit length used. The
paramter MPC defines thus the nonius system and
has to be chosen according to the magnetic code car-
rier. If MPC is switched during operation, command
ABS_RESET must be executed and the track offset
values must be calibrated again.
MPC(3:0)
Addr. 0x0F; bit 3:0
Code
Master
period
count
Nonius
period
count
bitlength
0x4
16
15
4
0x5
32
31
5
0x6
64
63
6
for MU as Nonius-Multiturn *)
0x7
128
127
7
0x8
256
255
8
0x9
512
511
9
0xA
1024
1023
10
0xB
2048
2047
11
0xC
4096
4095
12
Note
*) see page 40
synchroni-
sation
bitlength
8
7
6
5
4
3
2
1
0
Table 48: Master period count and the resulting bit
lengths
LIN selects the hall sensors for linear or rotative sys-
tems.