IC-MH16_15 Datasheet, PDF (13/25 Pages) IC-Haus GmbH – 12-BIT ANGULAR HALL ENCODER

iC-MH16
12-BIT ANGULAR HALL ENCODER
preliminary
Rev A1, Page 13/25
After switch-on the amplification is increased until the
0.4
setpoint amplitude is reached. The amplification is au-
0.2
tomatically corrected in case of a change in the input
amplitude by increasing the distance between the mag-
0.0
net and the sensor, in case of a change in the supply
-0.2
voltage or a temperature change. The sine signals are
-0.4
therefore always converted into high-resolution quadra-
0
ture signals at the optimum amplitude.
0.2
0.0
± 0.35°
90
180
270
360
angular position [degree]
-0.2
VOSS(6:0)
VOSC(6:0)
0x00
0x01
...
0x3F
0x40
0x41
...
0x7F
Addr. 0x02; bit 6:0
Addr. 0x03; bit 6:0
0 mV
1 mV
...
63 mV
0 mV
-1 mV
...
-63 mV
0.4
0.2
0.0
± 0.2 °
-0.2
-0.4
0
90
180
270
360
angular position [degree]
Figure 8: Harmonic calibration
Table 10: Offset calibration for sine and cosine
ENF
Code
0x0
0x1
Addr. 0x02; bit 7
Description
16 kHz cutoff frequency
3 kHz cutoff frequency
An offset in the sine or cosine signal can be corrected
by the VOSS and VOSC registers. The output voltage
can be shifted by ±63 mV in each case to compensate
for the offset.
Table 12: Filter
The amplifier cutoff frequency can be programmed with
ENF.
PRM
0
1
Addr. 0x03; bit 7
Energy-saving mode deactivated
Energy-saving mode active
HARMCAL
0x00
0x01
...
0x0F
0x10
0x11
...
0x1F
Addr. 0x0A;
0 LSB
1 LSB
...
15 LSB
0 LSB
-1 LSB
...
-15 LSB
bit 4:0
Table 11: Harmonic calibration
Table 13: Energy-saving mode
In the energy-saving mode the current consumption of
the Hall sensors can be quartered. This also reduces
the maximum rotating frequency by a factor of 4.
CIBM(3:0)
0x0
...
0x8
0x9
...
0xF
Addr. 0x04; bit 3:0
-40 %
...
0%
+5 %
...
+35 %
After calibration of offset and gain a residual er-
ror with four times period remains. This error
can be reduced with the calibration parameter
HARMCAL. The mode of operation shows Fig. 8.
Table 14: Calibration of bias current
The bias current is factory calibrated to 200 µA. The
calibration can be verified in test mode (TEST = 0x43)
by measuring the current from Pin B to Pin VNA.