IC-MH_17 Datasheet, PDF (12/26 Pages) IC-Haus GmbH – 12-BIT ANGULAR HALL ENCODER

iC-MH
12-BIT ANGULAR HALL ENCODER
Rev C2, Page 12/26
PSIN−NSIN
PCOS−NCOS
4Vss
Figure 6: Definition of differential amplitude
After switch-on the amplification is increased until the
setpoint amplitude is reached. The amplification is au-
tomatically corrected in case of a change in the input
amplitude by increasing the distance between the mag-
net and the sensor, in case of a change in the supply
voltage or in temperature. The sine signals are there-
fore always converted into high-resolution quadrature
signals at the optimum amplitude.
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
Table 10: Offset calibration for sine and cosine
PRM
0
1
Addr. 0x03; bit 7
Energy-saving mode deactivated
Energy-saving mode activated
Table 11: 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 %
Table 12: Calibration of bias current
In the test mode (TEST = 0x43) the internal bias cur-
rent IBM can be measured on pin B vs pin VNA and
changed via register CIBM to achieve a nominal value
of 200 µA. CIBM is preprogrammed to the zapping ROM
by iC-Haus and needs no further adjustment.
HCLH
0
1
Addr. 0x04; bit 7
250 kHz
500 kHz
Should there be an offset in the sine or cosine signal
that, among other things, can also be caused by an
inexactly adjusted magnet, then this offset can be cor-
rected by the VOSS and VOSC registers. The output
voltage can be shifted by ±63 mV in each case to com-
pensate for the offset.
Table 13: Activation of high Hall clock pulse
The switching-current Hall sensors can be operated
at two frequencies. At 500 kHz the sine has twice the
number of support points. This setting is of interest at
high speeds above 30,000 rpm.