Datasheet

iC-WE
3-CHANNEL 75 Ω LINE DRIVER
Rev D1, Page 7/10
LINE 100 m
CMOS/TTL -
INPUTS
ERROR
PLC
+5 V +24 V
+5 V +24 V +24 V
D1
D2
D3
ERROR
TRI-STATE
SO20
ERROR
LOW VOLTAGE
MODE
CHAN1
CHAN2
CHAN3
T.SHUTDOWN
iC-WE
SO20
ERROR
LOW VOLTAGE
MODE
CHAN1
CHAN2
CHAN3
T.SHUTDOWN
iC-WE
E2
20
E3
19
E1
1
INV
9
TRI
8
TNER
10
VCC
2
VB
12
NER
3
A1
11
A2
13
A3
18
GND
4-7,14-17
E2
20
E3
19
E1
1
INV
9
TRI
8
TNER
10
VCC
2
VB
12
NER
3
A1
11
A2
13
A3
18
GND
4-7,14-17
Fig. 4: Balanced data transmission
EXAMPLE 1: Balanced data transmission over twisted-pair cables
For balanced data transmission two iC-WE devices can be operated in parallel at the inputs with different
programming of the individual INVert input. The OC error outputs NER are linked for the system fault message.
EXAMPLE 2: Incremental encoder
Fig. 5 shows the iC-WE being used in an optical encoder system together with the iC-Haus incremental encoder
iC-WT.
The iC-WT device is an evaluating IC for photodiode arrays used in incremental lengths and angle measuring
systems. It preprocesses the sensor signals for transmission with line driver iC-WE. At the receive end the
programmable logic controller (PLC) interface can be via optocoupler.
The preprocessed sensor signals are transmitted over cable by the iC-WE with asymmetrical activation. A high
interference immunity is achieved as a result of the high output amplitude and the integrated characteristic
adaption of the iC-WE.
The 24 V power supply is conducted over the cable from the PLC end. A voltage regulator generates the 5 V
supply to the encoder system. It is favourable to use the iC-WD switching regulator device instead of
aconventional voltage regulator. This switched-mode power supply IC operates from 8 to 30 V input voltage and
contains two 5 V post regulators. Analog and digital devices can thus receive separate supply voltages.