INCREMENTAL ENCODER
iC-WT
INCREMENTAL ENCODER
FEATURES
♦ Differential scanning for track A and B ♦ Constant-light-evaluated scanning for the...
Description
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
CODEWHEEL
PHOTODIODES ARRAY
14 DPA
DPA
15 DNA DNA
12 DPB
DPB
13 DNB DNB
iC-OR
CLR 10nF
11 DZ DZ
RLR RZ 15kΩ 15kΩ
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 68Ω
©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-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 ...
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