iC-MA
ANGULAR HALL SENSOR / ENCODER
Rev B3, Page 12/18
Resistor modes of operation
Mode
NEN CFG1 CFG2 CFG3
Port A
Port B
Port C
Port D Res. Comments
Linear output
R-Sensor low
low open low
VTRI
VTRI
VSAW
VSAW
REFH
REFH
REFH
REFH
MSB
MSB
REFL
REFL
NERR
GAIN
NERR
GAIN
8
8
8
8
low open open low
low high open low
low high open high
5
Resistor modes of operation
In R sensor mode the taps of an integrated resistive
divider are selected depending on the angular position
("potentiometer replacement"). The value of the abso-
lut angular position acts as a "wiper" and selects one
of the 256 taps on the resistor chain.
REFH
4
3
2
1
0
VSAW
REFL
0
45
90 135 180 225 270 315 360 405 450
Angle [°]
Figure 9: R-Sensor mode with sawtooth output volt-
age VSAW
Figure 8: Potentiometer equivalents for resistor
mode operations
5
In modes with a sawtooth voltage VSAW at port A
the angle is converted into a linear voltage which lies
within thresholds REFH and REFL at ports B and C
(see Figure 9). The integrated resistor chain is di-
rectly available at the ports so that thresholds REFH
and REFL can also be reversed. Depending on the
selected mode either a GAIN signal or a NERR error
signal are present at port D to monitor the amplitude.
If the amplitude is at least 70 %, NERR is high; should
the amplitude sink to below 50 % of the set amplitude,
NERR switches to active low.
REFH
4
3
2
VTRI
1
MSB
Modes of operation with a triangular voltage VTRI
avoids the discontinuity at the zero angular position.
Signal MSB can be used to differentiate between the
first and second half rotation. The delta voltage is lim-
ited by thresholds REFH and GND. As in VSAW mode
both GAIN and NERR signals are available.
0
0
45
90 135 180 225 270 315 360 405 450
Angle [°]
Figure 10: R-Sensor mode with triangular output
voltage VTRI
ICHAUS [ IC-HAUS GMBH ]
