IC-MA_14 Datasheet, PDF (13/19 Pages) IC-Haus GmbH – 8-BIT ANGULAR HALL SENSOR / ENCODER

iC-MA
8-BIT ANGULAR HALL SENSOR / ENCODER
RESISTOR MODES OF OPERATION
Rev C1, Page 13/19
Mode NEN CFG1 CFG2 CFG3
Linear Output
R-Sensor low low open low
low open open low
low high open low
low high open high
Port A
VTRI
VTRI
VSAW
VSAW
Port B
REFH
REFH
REFH
REFH
Port C
MSB
MSB
REFL
REFL
Resistor Modes of Operation
5
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-
4
lute angular position acts as a wiper and selects one
of the 256 taps on the resistor chain.
3
2
1
Port D Res. Comments
NERR 8
GAIN 8
NERR 8
GAIN 8
REFH
VSAW
REFL
Figure 7: Potentiometer equivalents for resistor
mode operations
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 8). 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 level is high;
should the amplitude sink to below 50 % of the set am-
plitude, NERR switches to active low.
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 8: R-Sensor mode with sawtooth output volt-
age VSAW
5
REFH
4
3
2
VTRI
1
MSB
0
0 45 90 135 180 225 270 315 360 405 450
Angle [°]
Figure 9: R-Sensor mode with triangular output volt-
age VTRI