ic-wt iC-Haus, ic-wt Datasheet

no-image

ic-wt

Manufacturer Part Number
ic-wt
Description
Incremental Encoder
Manufacturer
iC-Haus
Datasheet
iC-Haus GmbH
Integrated Circuits
Am Kuemmerling 18, D-55294 Bodenheim
iC-WT
INCREMENTAL ENCODER
FEATURES
BLOCK DIAGRAM
©1997
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
+5V
LED
iC-OR
PHOTODIODES ARRAY
10nF
CLR
DPA
DPB
DZ
15k
RLR
DNA
DNB
15k
RZ
10
16
14
15
12
13
11
8
9
CLR
ILR
IZ
DPA
DNA
DPB
DNB
DZ
AGND
LED CURRENT CONTROL
ERROR
iC-WT
2
GND
1
VCC
APPLICATIONS
PACKAGES
Photocurrent evaluation for
incremental linear or angular
position measuring systems
DRIVER
LED
TRACK A
TRACK B
TRACK Z
NERR
LED
SO16N
A
B
Z
Tel
Fax +49-6135-9292-192
http://www.ichaus.com
Rev A0
3
4
5
7
6
+49-6135-9292-0
RLED
68
+5V
OUT_A
OUT_B
OUT_Z
ERROR

Related parts for ic-wt

ic-wt Summary of contents

Page 1

... IZ 16 AGND RZ LED CURRENT CONTROL 15k APPLICATIONS Photocurrent evaluation for incremental linear or angular position measuring systems PACKAGES SO16N 2 VCC 3 A TRACK TRACK B iC- TRACK Z 6 NERR LED 7 LED DRIVER RLED 68 GND 1 Rev A0 Tel +49-6135-9292-0 Fax +49-6135-9292-192 http://www.ichaus.com +5V OUT_A OUT_B ...

Page 2

... INCREMENTAL ENCODER DESCRIPTION The device iC- 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 constant light ...

Page 3

... INCREMENTAL ENCODER ABSOLUTE MAXIMUM RATINGS Values beyond which damage may occur; device operation is not guaranteed. Item Symbol Parameter G001 VCC Supply Voltage G002 I(DPx) Current in Inputs I(DNx) DPA, DNA, DPB, DNB G003 V(A,B,Z) Voltage at Outputs G004 I(A,B,Z) Current in Outputs G005 I(DZ) Current in Input DZ ...

Page 4

... INCREMENTAL ENCODER ELECTRICAL CHARACTERISTICS Operating Conditions: VCC= 5V 10%, Tj= -25..125 C, unless otherwise noted Item Symbol Parameter Total Device 001 VCC Permissible Supply Voltage 002 I(VCC) Supply Current in VCC, Outputs 003 I(VCC) Supply Current in VCC, Outputs 004 fo Cut-off Frequency ...

Page 5

... INCREMENTAL ENCODER ELECTRICAL CHARACTERISTICS Operating Conditions: VCC= 5V 10%, Tj= -25..125 C, unless otherwise noted Item Symbol Parameter Push-Pull Outputs (continued) 306 Isc()lo Short-Circuit Current lo 307 Vc()hi Clamp Voltage hi 308 Vc()lo Clamp Voltage lo LED Current Control, pins CLR, ILR, IZ, LED 601 ISUM Permissible Total Sensor Current ...

Page 6

... Figure 1 illustrates the layout of the entire electronic system of an incremental rotary encoder. The devices iC-OR (photodiodes array), iC-WT (incremental encoder) and iC-WE (line driver) from iC-Haus are used. The rotary encoder requires the supply voltages VCC= +5V and VB= +5V to +30V (line driver) and supplies the conditioned signals of tracks A and B and index track Z at the outputs. It’ ...

Page 7

... TRI). An error detector monitors the chip temperature as well as the supply voltages VCC and VB. In the event of a fault, the open-collector output NER is switched low and the output stages are switched to high impedance to prevent destruction. The error signal of the incremental encoder iC-WT can be switched through to the output NER via the error input TNER. ...

Page 8

... not run the printed conductors of the outputs of iC-WT and iC-WE in the vicinity of the connections between photodiodes array and iC-WT or decouple by means of a GND conductor between them. - Connecting point of a metal reticle for the photodiodes array is GND on the iC-WT 7.625 k ). ILR is connected directly to IZ. ...

Page 9

... INCREMENTAL ENCODER DEMO BOARD The demonstration board provides a survey over the properties of the iC-WT simply and easily. The encoder IC is already connected to the necessary external components. In addition, the board contains subunits which can be utilized to have measurements performed - even without a rotary encoder. Figures show the wiring as well as the top and bottom layout of the test PCB ...

Page 10

... A regulated power supply of +5V dc must be applied between VCC and GND for all measurements. Since the iC-WT operates with very low sensor currents, the work surface should possess an insulated screen (e.g. a single sided copper-clad plate) which is connected to GND. AGND is pulled down to GND inside the iC-WT and should not be interconnected externally. The transmit LED of the rotary encoder can be connected between LED and VCC ...

Page 11

... INCREMENTAL ENCODER If two of the DIP switches No.4 to No.7 are closed, the actual value 420nA = 840nA, SUM Correspondingly, for the resistance RLR: RLR= 1.22V / (840nA 100) = 14.5k If the resistance set with the trimmer RLR is smaller, the result is a setpoint which is larger than the actual value ...

Page 12

... INCREMENTAL ENCODER Modulating ACA around its mean value functions like a linear differential activation of the inputs DPA and DNA. The modulation limits are V and appropriate rectangular signal can be picked off at output A with an oscilloscope. For a pulse duty factor of 1:1 it may be necessary to readjust the temperature-dependent medium voltage at ACA. In addition, at high frequencies over 200kHz the parasitic capacities of the test circuit affect the activation and thus the output signal ...

Page 13

... We do not assume any guarantee that the specified circuits or procedures are free of copyrights of third parties. Copying - even as an excerpt - is only permitted with the approval of the publisher and precise reference to source. Order designation iC-WT-SO16N WT Demo Board Tel +49-6135-9292-0 Fax +49-6135-9292-192 http://www ...

Related keywords