iC-LSHC
preliminar y
Rev B1, Page 2/7
3-CHANNEL SIN/COS PHOTOSENSOR ARRAY
DESCRIPTION
The iC-LSHC photosensor is a general purpose op-
toelectronic scanner made to suit a variety of encod-
ing applications, such as rotary and linear encoders
used for motion control, robotics, brushless DC motor
commutation, power tools etc.
iC-LSHC features 12 monolithically integrated photo-
sensors with active areas of 800 µm x 330 µm each.
A high transimpedance gain of typically 4 MΩ gener-
ates output signals of a few hundret Millivolts already
from illumination levels of 0.3 to 0.7 mW/cm
2
. In most
cases no additional measures must be considered to
filter for noise and interferences.
Sine/cosine encoders are the typical application for
iC-LSHC. Its 3-track scanning features a set of 4 pho-
tosensors each per track, generating positive and
negative going sine signals, as well as positive and
negative going cosine signals. An excellent matching
and common mode behavior of the differential signal
paths is obtained by a paired amplifier design, re-
ducing the needs for external signal calibration to an
absolute minimum.
The spectral sensitivity range includes visible to near
infrared light, with the maximum sensitivity being
close to a wavelength of 680 nm. When using iC-
LSHC for encoder applications with typical disc and
mask codes, a signal amplitude of approximately 1 V
is typical under low light conditions, for instance when
iC-LSHC is illuminated at only 1.5 mW/cm
2
by an
740 nm LED.
PACKAGES
PAD LAYOUT (2.88 mm x 3.37 mm)
PAD FUNCTIONS
No. Name Function
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
VCC
VREF
PS_N
NS_N
PS_M
NS_M
PS_S
NS_S
NC_S
PC_S
NC_M
PC_M
NC_N
PC_N
GND
+4.5..5.5 V Supply Voltage
Reference Voltage Output
N-Track Sine +
N-Track Sine -
M-Track Sine +
M-Track Sine -
S-Track Sine +
S-Track Sine -
S-Track Cosine -
S-Track Cosine +
M-Track Cosine -
M-Track Cosine +
N-Track Cosine -
N-Track Cosine +
Ground
Notes: All outputs supply analog volt-
ages.
Dimension G4 is the reference radius of
the chip center.
ICHAUS [ IC-HAUS GMBH ]
