iC-WE
3-CHANNEL 75
Ω
LINE DRIVER
Rev D1, Page 7/10
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.
+5 V
2
+24 V
12
VB
NER
3
+24 V
ERROR
TRI-STATE
VCC
10
8
9
TNER
TRI
INV
MODE
ERROR
ERROR
LOW VOLTAGE
T.SHUTDOWN
SO20
1
E1
CHAN1
iC-WE
A1
11
LINE 100 m
A2
13
PLC
CMOS/TTL -
INPUTS
20
E2
CHAN2
19
E3
CHAN3
A3
18
D1
D2
D3
GND
4-7,14-17
+5 V
2
VCC
10
8
9
TNER
TRI
INV
MODE
ERROR
+24 V
12
VB
NER
3
LOW VOLTAGE
T.SHUTDOWN
SO20
1
E1
CHAN1
iC-WE
A1
11
20
E2
CHAN2
A2
13
19
E3
CHAN3
GND
4-7,14-17
A3
18
Fig. 4: Balanced data transmission
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.
ICHAUS [ IC-HAUS GMBH ]
