ic-wt iC-Haus, ic-wt Datasheet - Page 2

• Manufacturer Part Number: ic-wt
• Description: Incremental Encoder
• Manufacturer: iC-Haus

iC-WT
INCREMENTAL ENCODER
DESCRIPTION
The device iC-WT is an evaluator IC for optical increment linear and rotary motion sensors, e.g. glass
scales or shaft encoders.
A photodiodes array supplies the input signals for the monolithically integrated amplifiers, comparators and
the TTL compatible push-pull output drivers. Two tracks, A and B, are evaluated differentially, the index
track Z as a constant light.
An integrated LED current control with driver stage enables the direct connection of a transmit LED with
series resistor and ensures a constant optical receive power. Two external resistors are used to set the
relative index track comparator threshold and to determine the receive photocurrents.
The internally available logical AND operation of index track Z to tracks A and B can be switched off for
adjustment.
A monitor circuit triggers an error message when the LED current control range is violated. The fault output
designed as an open collector is low active and simultaneously functions as an input to turn off the AND
operation of the index track.
All connections are protected against damage due to ESD. The outputs are short-circuit proof.
PACKAGES SO16N to JEDEC Standard
PIN CONFIGURATION SO16N
(top view)
PIN FUNCTIONS
No. Name Function
1
2
3
4
5
6
7
8
9
10 ILR
11 DZ
12 DPB
13 DNB
14 DPA
15 DNA
16 AGND Common Anode for all photodiodes,
GND
VCC
A
B
Z
NERR Fault Output / AND Gate Disable
LED
CLR
IZ
Ground
+5V Supply Voltage
Track A TTL Output
Track B TTL Output
Track Z TTL Output
Cathode LED
Capacitor for LED Current Control
Threshold for Index Track
Current Control Adjust
Cathode Photodiode Index Track Z
Cathode Photodiode Track B+
Cathode Photodiode Track B-
Cathode Photodiode Track A+
Cathode Photodiode Track A-
connected to GND internally
Rev A0, Page 2/13