IC-LO_16 Datasheet, PDF (12/25 Pages) IC-Haus GmbH – TRIANGULATION SENSOR

iC-LO
TRIANGULATION SENSOR
MEASURING SEQUENCE
preliminary
Rev B3, Page 12/25
In order to determine whether the distance between
an object and the sensor falls below a defined value,
iC-LO initiates a light pulse that is then diffuse reflected
and pictured onto the photodiode array. The spot of
light diffuse reflected by the object moves along the
diode array depending on the distance object to sensor.
After the light pulse has been transmitted, at a defined
point in time the signal from the photodiode array is
evaluated and decided whether the distance between
the object and sensor has fallen below a defined value
or not.
LED DRIVER
iC-LO can drive a transmitting LED directly or trigger an
external driver using the CMOS level output. A lowside
driver is integrated to drive the LED and can supply
diode currents of up to approx. 1 A with an external
back-up capacitor.
The type of output at pin LED (low-side driver or CMOS
output) is set by parameter LCO.
LCO
Addr. 0x07; bit 5
RW
Code
Description
0x0
CMOS output at pin LED
0x1
Low-side driver at pin LED
Table 6: Configuration LED Output Type
The parameter LCC configures the LED current.
which correspond to high impedance of the transmitting
LED.
LEDOK
Code
0x0
0x0
0x1
Addr. 0x08; bit 0
R
Description
No LED current monitoring,
on CMOS output operation
LED current not ok, on low-side driver operation
LED current ok, on low-side driver operation
Table 8: LED Current Ok
This monitoring is only valid in low-side driver opera-
tion pin LED. When using the integrated LED driver the
current flowing out of the iC-LO is monitored. So an
eventual damage of the LED can be detected while in
use. For details see table 28 (status register).
LCC
Addr. 0x07; bit 4:0
RW
Code
Description
0x0
112 mA
0x1
126 mA
...
0x7
210 mA
0x8
193 mA
0x9
221 mA
...
0xF
389 mA
0x10
368 mA
0x11
423 mA
...
0x17
753 mA
0x18
696 mA
0x19
796 mA
...
0x1F
1396 mA
Table 7: Current in LED (low-side driver)
LED error monitoring
In order to monitor the system function it is possible
to read out status bit LEDOK (address 0x08, bit 0 R)
LED frequency and pulse width
The frequency of the light pulses in multiple measure-
ment mode (see table 18) and the duration of a light
pulse is set by parameters PER and PW.
PER
Addr. 0x08; bit 5:4
RW
Code
Description
0x0
reserved
0x1
13.9 kHz
0x2
10.4 kHz
0x3
5 kHz
Table 9: Pulse Frequency
PW
Addr. 0x08; bit 3:0
RW
Code
Description
0x0
2 µs
0x1
2.5 µs
...
0xF
9.5 µs
Table 10: Pulse Width