IC-OW Datasheet, PDF (2/7 Pages) IC-Haus GmbH – INCREMENTAL OPTO ENCODER

iC-OW
INCREMENTAL OPTO ENCODER
Rev A1, Page 2/7
DESCRIPTION
iC-OW is an evaluator iC for optical incremental linear and rotary motion sensors, such as glass scales or
shaft encoders, for example. A photodiode array, amplifiers, comparators and TTL-compatible push-pull
output drivers are integrated monolithically.
Two tracks, A and B, are evaluated differentially, with index track Z as constant light. The integrated LED
current control with a driver stage enables a transmitter LED with a series resistor to be directly connected to
the device and ensures a constant optical receive power. Two external resistors are used to set the
comparator threshold of the relative index track and to determine the receive photocurrents.
The internal logical AND operation of index track Z to tracks A and B can be switched off for adjustment.
A monitoring circuit generates an error message when the LED current control range is violated. The error
output, designed as an open collector, is low active and functions simultaneously as an input which can turn
off the AND operation of the index track.
All pins are protected against destruction by ESD. The outputs are short-circuit-proof.
CHIP LAYOUT
TIP
TIN
NTEST
A+ B+
B- A-
ILR IZ CLR
LED
NERR
Z
B
Z
A
VCC
AGND GND
PAD DESCRIPTION
Name
Function
VCC
A
B
Z
NERR
LED
CLR
IZ
ILR
GND
AGND
+5V Supply Voltage
Track A Output
Track B Output
Track Z Output
Error Output (low active) / AND Gate
Disable Input
LED Current Control Output
Capacitor for LED Current Control
Index Track Threshold Adjust
LED Current Control Setup
Ground
Reference Ground for
ILR, IZ, CLR circuitry
TIP
TIN
NTEST
Positive Test Aid Input
Negative Test Aid Input
Test Enable Input, low active