IC-LO_16 Datasheet, PDF (14/25 Pages) IC-Haus GmbH – TRIANGULATION SENSOR

iC-LO
TRIANGULATION SENSOR
preliminary
Rev B3, Page 14/25
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
If the parameters SPF and SPN are configured that
SPF < SPN then the numeric gap between both num-
bers representes the hysteresis of the sensor (indicated
blue for hysteresis in the evaluation software).
Configuring SPF > SPN is not recommended due
to a negative hysteresis.
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
2.65 mV
0x1
5.30 mV
0x2
7.95 mV
0x3
10.6 mV
0x4
13.25 mV
0x5
15.90 mV
0x6
18.55 mV
0x7
21.20 mV
0x8
26.50 mV
..
0xF
63.60 mV
Table 14: Comparator Hysteresis
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 partitioning the diode
array. Parameters POTF (parameter set OBF) and
POTN (parameter set OBN) configure the potentiome-
ter.
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
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
If the parameters THSE or THSW are configured that
the voltage levels of THSE or THSW are smaller than
the voltage level of HYSS/2 then the compared voltage
can not fall below 0 V and then the related comparator
output can not turn to 0 any more (indicated yellow for
warning this parameter conflict of HYSS and THSE and
THSW in the evaluation software).
Configuring the voltage levels of THSE < HYSS/2
is not recommended.
Configuring the voltage levels of THSW < HYSS/2
is not recommended.
Table 13: Digital Potentiometer
The hysteresis can be deactivated by DISHYS.
A gain ratio of > 1 shifts the switching point towards
shorter distances and vice versa.
DISHYS
Addr. 0x04; bit 4
RW
Code
Description
Comparator hysteresis
0x0
To stabilize the comparator outputs the system hys- ^0x1
Hysteresis set by HYS
Hysteresis deactivated
teresis of the three comparators KD(comparator differ-
ence signal), KSw(comparator warning threshold), and
Table 16: Hysteresis Deactivation