IC-LO Datasheet, PDF (13/21 Pages) IC-Haus GmbH – TRIANGULATION SENSOR

iC-LO
TRIANGULATION SENSOR
preliminary
Rev A1, Page 13/21
OBF and SPN to parameter set OBN. Diodes from 0
(near diode) to the set value are assigned to the near
channel, with the remaining diodes up to diode 128 (far
diode) assigned to the far channel.
SPF
Addr. 0x00; bit 6:0
RW
SPN
Addr. 0x02; bit 6:0
RW
Code
Description
0x0
0
0x1
1
...
0x7F
127
Table 12: Diode Assignment
Setting parameter gain ratio In the subtractor the
gain ratio between the near and far channel can be
adjusted using a digital potentiometer. This achieves
a higher measurement resolution than only partition-
ing the diode array. Parameters POTF (parameter set
OBF) and POTN (parameter set OBN) configure the
potentiometer.
teresis of the three comparators KD(compatator differ-
ence signal), KSw(comparator warning threshold), and
KSe(comparator error threshold) can be configured.
The system hysteresis is switched with the sampled
and filtered comparator output signals KDF, KSwF, and
KSeF. Parameter HYSD is used to set the hysteresis of
differential comparator KD and parameter HYSS that
of sum comparators KSw and KSe.
HYSD
Addr. 0x04; bit 3:0
RW
Code
Hysteresis KD
0x0
3 mV
0x1
6 mV
0x2
9 mV
0x3
12 mV
0x4
15 mV
0x5
18 mV
0x6
21 mV
0x7
24 mV
0x8
30 mV
..
0xF
72 mV
POTF
Addr. 0x01; bit 7:0
RW
POTN
Addr. 0x03; bit 7:0
RW
Code
Gain Ratio Near/Far Channel
0x00
0.327
0x01
0.330
...
0x7E
0.988
0x7F
0.996
0x80
1.004
0x81
1.012
...
0xFE
3.026
0xFF
3.059
Table 13: Digital Potentiometer
A gain ratio of > 1 shifts the switching point towards
shorter distances and vice versa.
Comparator hysteresis
To stabilize the comparator outputs the system hys-
Table 14: Comparator Hysteresis
HYSS
Addr. 0x05; bit 7:6
RW
Code
Hysteresis KSw, KSe
0x0
2 mV
0x1
4 mV
0x2
6 mV
0x3
8 mV
Table 15: Comparator Hysteresis
The hysteresis can be deactivated by DISHYS.
DISHYS
Addr. 0x04; bit 4
RW
Code
Description
0x0
Hysteresis set by HYS
0x1
Hysteresis deactivated
Table 16: Hysteresis Deactivation