IC-MU_13 Datasheet, PDF (20/59 Pages) IC-Haus GmbH – OFF-AXIS NONIUS ENCODER WITH INTEGRATED HALL SENSORS

iC-MU OFF-AXIS NONIUS ENCODER
WITH INTEGRATED HALL SENSORS
preliminary
Rev B1, Page 20/59
ENAC
Code
0
1
Addr. 0x05; bit 7
Description
Amplitude control not active (constant)
Amplitude control active (sin² + cos²)
Table 18: Amplitude control unit activation
After startup the gain is increased until the set ampli-
tude is obtained. If the input amplitude is altered by the
distance between the magnet and sensor being varied,
or if there is a change in the supply voltage or temper-
ature, the gain is automatically adjusted. The conver-
sion of the sine signals into high-resolution quadrature
signals thus always takes place at optimum amplitude.
PSIN_x
PCOS_x
SIN
DIG
PSIN 500mV/DIV 100µs/DIV
PCOS 500mV/DIV
PSx
PCx
PSM 200mV/DIV 100µs/DIV
PCM 200mV/DIV
2Vss
0.5Vss
VOSS_M(6:0)
Addr. 0x02; bit 6:0
VOSS_N(6:0)
Addr. 0x08; bit 6:0
VOSC_M(6:0)
Addr. 0x03; bit 6:0
VOSC_N(6:0)
Addr. 0x09; bit 6:0
Code
Description
0x00
0 mV
0x01
1 mV
...
...
0x3F
63 mV
0x40
0 mV
0x41
-1 mV
...
...
0x7F
-63 mV
Table 19: Sine and cosine offset adjustment
Phase adjustment
The phase between sine and cosine is adjusted by
PH_x (6:0). The compensation range for the master
track is approx. ±6°. The compensation range for the
nonius track is nearly twice as large and is approx.
±11.25°.
PH_M(6:0)
Code
0x00
...
0x3F
0x40
...
0x7F
Addr. 0x04; bit 6:0
Function
0°
+ 6°*PH_M/63
+ 6°
0°
- 6 °*(PH_M-64)/63
-6°
Figure 10: Definition of differential amplitude
Offset compensation
If there is an offset in the sine or cosine signal, possibly
caused by a magnet not being precisely adjusted, for
instance, this can be corrected by registers VOSS_x
and VOSC_x. The output voltage can be shifted in
each case by ±63 mV in order to compensate for the
offset.
Table 20: Master track phase adjustment
PH_N(6:0)
Code
0x00
...
0x3F
0x40
...
0x7F
Addr. 0x0A; bit 6:0
Function
0°
+ 11,25°*PH_N/63
+ 11,25°
0°
- 11,25 °*(PH_N-64)/63
- 11,25 °
Table 21: Nonius track phase adjustment