iC-OV

5-BIT OPTO ENCODER

Rev C0, 2/9

DESCRIPTION

The device iC-OV is an optoelectronic encoder IC for absolute linear or angle measuring systems, e.g. glass

scales or rotary encoders.

Photodiodes, amplifiers, comparators and TTL-compatible push-pull output drivers for 5 tracks are

monolithically integrated, as well as a reference photodiode to control the LED current. The track pitch is 600

µm.

The outputs switch to high when the amplified photoelectric currents exceed a preset threshold (constant-light

evaluation). The operating point is determined by an external resistor at RSET.

This resistor also establishes the setpoint for the LED current control. The control keeps the optical receive

power constant, irrespective of the temperature or the effects of ageing. The driver stage of the LED current

control makes it possible to connect an LED with series resistor directly.

A monitoring circuit generates a fault message in the event of undervoltage, overtemperature or violation of

the LED current control range. The fault message output is busable (open collector) and low active.

Two test pins permit a complete function test (without photodiodes).

All inputs and outputs are protected against destruction by ESD. The outputs are short-circuit-proof and are

switched off in case of thermal overload.