iC-MH8
12 BIT ANGULAR HALL ENCODER
Rev A0.9, Page 13/25
PRM
Addr. 0x03; bit 7
PSIN−NSIN
0
1
Energy-saving mode deactivated
Energy-saving mode active
4Vss
PCOS−NCOS
Table 11: Energy-saving mode
Figure 6: Definition of differential amplitude
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.
After switch-on the amplification is increased until the
setpoint amplitude is reached. The amplification is
automatically corrected in case of a change in the
input amplitude by increasing the distance between
the magnet and the sensor, in case of a change in
the supply voltage or a temperature change. The
sine signals are therefore always converted into high-
resolution quadrature signals at the optimum ampli-
tude.
CIBM(3:0)
Addr. 0x04; bit 3:0
0x0
...
-40 %
...
0x8
0x9
...
0 %
+5 %
...
0xF
+35 %
VOSS(6:0)
VOSC(6:0)
0x00
Addr. 0x02; bit 6:0
Addr. 0x03; bit 6:0
Table 12: Calibration of bias current
0 mV
1 mV
...
0x01
...
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.
0x3F
63 mV
0 mV
-1 mV
...
0x40
0x41
...
HCLH
Addr. 0x04; bit 7
250 kHz
500 kHz
0x7F
-63 mV
0
1
Table 10: Offset calibration for sine and cosine
Table 13: Activation of high Hall clock pulse
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- The switching-current hall sensors can be operated at
rected by the VOSS and VOSC registers. The output two frequencies. At 500 kHz the sine has twice the
voltage can be shifted by ±63 mV in each case to com- number of support points. This setting is of interest at
pensate for the offset.
high speeds above 30,000 rpm.
ICHAUS [ IC-HAUS GMBH ]
