preliminary

preliminary

iC-LSHC

3-CHANNEL SIN/COS PHOTOSENSOR ARRAY

Rev B1, Page 2/7

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

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

740 nm LED.

PACKAGES

PAD LAYOUT (2.88 mm x 3.37 mm)

PAD FUNCTIONS

No. Name Function

1 VCC

+4.5..5.5 V Supply Voltage

2 VREF Reference Voltage Output

3 PS_N N-Track Sine +

4 NS_N N-Track Sine -

5 PS_M M-Track Sine +

6 NS_M M-Track Sine -

7 PS_S S-Track Sine +

8 NS_S S-Track Sine -

9 NC_S S-Track Cosine -

10 PC_S S-Track Cosine +

11 NC_M M-Track Cosine -

12 PC_M M-Track Cosine +

13 NC_N N-Track Cosine -

14 PC_N N-Track Cosine +

15 GND

Ground

Notes: All outputs supply analog volt-

ages.

Dimension G4 is the reference radius of

the chip center.