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iC-WT Datasheet Preview

iC-WT Datasheet

INCREMENTAL ENCODER

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iC-WT
INCREMENTAL ENCODER
FEATURES
Differential scanning for track A and B
Constant-light-evaluated scanning for the index track Z with
adjustable relative threshold
Photocurrent amplifier with high cut-off frequency
Current comparators with hysteresis
Index track Z selectable gated by tracks A and B
Current-limited and short-circuit-proof push-pull outputs
Outputs TTL compatible
Adjustable LED current control for constant optical receiver
power
Integrated 50mA driver for the transmit LED
LED current monitoring and error message upon violating
the control range
Low current consumption from single 5V power supply
Option: enhanced temperature range -40..125°C
APPLICATIONS
Photocurrent evaluation for
incremental linear or angular
position measuring systems
PACKAGES
SO16N
BLOCK DIAGRAM
+5V
LED
PHOTODIODES ARRAY
14 DPA
DPA
15 DNA
DNA
12 DPB
DPB
13 DNB
DNB
iC-OR
CLR
10nF
11 DZ
DZ
RLR RZ
15k15k
8
10
9
16
CLR
ILR
IZ
AGND
2
VCC
A3
TRACK A
+5V
OUT_A
B4
TRACK B
iC-WT
Z5
ERROR
TRACK Z
NERR
6
LED
LED 7
LED CURRENT CONTROL
GND
1
DRIVER
OUT_B
OUT_Z
ERROR
RLED
68
©1997
iC-Haus GmbH
Integrated Circuits
Am Kuemmerling 18, D-55294 Bodenheim
Rev A0
Tel +49-6135-9292-0
Fax +49-6135-9292-192
http://www.ichaus.com




iC-Haus

iC-WT Datasheet Preview

iC-WT Datasheet

INCREMENTAL ENCODER

No Preview Available !

iC-WT
INCREMENTAL ENCODER
Rev A0, Page 2/13
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 GND Ground
2 VCC +5V Supply Voltage
3A
Track A TTL Output
4B
Track B TTL Output
5Z
Track Z TTL Output
6 NERR Fault Output / AND Gate Disable
7 LED Cathode LED
8 CLR Capacitor for LED Current Control
9 IZ Threshold for Index Track
10 ILR Current Control Adjust
11 DZ Cathode Photodiode Index Track Z
12 DPB Cathode Photodiode Track B+
13 DNB Cathode Photodiode Track B-
14 DPA Cathode Photodiode Track A+
15 DNA Cathode Photodiode Track A-
16 AGND Common Anode for all photodiodes,
connected to GND internally


Part Number iC-WT
Description INCREMENTAL ENCODER
Maker iC-Haus
Total Page 13 Pages
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