IC-LO Datasheet, PDF (2/21 Pages) IC-Haus GmbH – TRIANGULATION SENSOR

iC-LO
TRIANGULATION SENSOR
preliminary
Rev A1, Page 2/21
DESCRIPTION
iC-LO is suitable for the assembly of diffuse reflec-
tive photoelectric sensors based on the principle of
triangulation. Besides iC-LO, all that is required to
create such a setup is a transmitting LED, a low-cost
microcontroller, and a driver device for the switching
output.
The iC contains a photodiode array, consisting of one
near diode, 127 middle diodes, and one far diode.
The diode photocurrents are segmented on two AC
amplifiers (near and far channel). The AC amplifiers
ensures a very good suppression of low-frequency
interference. The sum and difference are calculated
from the output voltages of the amplifiers; these are
evaluated by comparators. From the comparator sig-
nals a programmable filter for the evaluation of mul-
tiple measurements generates the switching signal
for the light sensor and also a warning on weak re-
ceived light. The gain characteristic is dynamically
adjusted to the intensity of the received light and be-
comes a logarithmic characteristic with very power-
ful input signals (reflective objects). This results in
a very high dynamic range. The integrated low side
driver can drive an LED directly or control an external
driver by CMOS output.
iC-LO is configured using an SPI interface. The in-
ternal registers can be protected against overwriting.