Features
■ For IEC61131-2 type 1 and 3 inputs
■ 4 input channel topology
■ Fully integrated internally fixed current limiter
■ Optocoupler output drive
■ Wide range supply voltage and temperature
operation
Description
The CLT3-4B is a quadruple logic input
termination for sensor or mechanical switch
interfaces. It is designed to work in 24 VDC
applications such as PLCs (programmable logic
controllers), PACs (programmable automation
controllers) and distributed I/O systems used in
factory automation.
STEVAL-IFP008V1
Demonstration board for the
CLT3-4B current limited termination
Data Brief
STEVAL-IFP008V1
The most important aspect of the CLT3-4B is the
electrical protection and susceptibility its brings to
the application. The CLT3-4B implements efficient
protection diodes on each input and supply voltage line. Serial resistors ensure a higher level of
susceptibility of the entire input module.
The device optimize s the input VI char acteristic to
reduce its power dissipation. This becomes
critical when the application cabinet or housing
requires higher protection le vels such as IP65 and
IP67. These closed cabinets are used in various
automated lines including the fo od and chemical
industry.
The power dissipated inside the module is very
limited as there is usually no air circulation inside
the box. The current limitation also reduces the
power losses in the sensor.
Thanks to its compact TSSOP20 package, the
CLT3-4B device occupies very little space on the
PCB compared to an equivalent discrete solution.
July 2008 Rev 1 1/4
For further information contact your local STMicroelectronics sales office .
www.st.com
4
Block diagram STEVAL-IFP008V1
1 Block diagram
Figure 1. Circuit block diagram
123
J2
APP
V
APP
V
16
15
U2
1
2
0 Ω
OUT119OUT217OUT314OUT4
456
OUTPUT
RN1
330 Ω
1234
APP
V
14
3
0 Ω
13
4
12
APP
V
12
5
0 Ω
13
COM1218COM34
11
6
20
0 Ω
COM
APP
V
10
7
11
COM16COM15COM
9
TLP281-4
8
5 6 7 8
LED1
LED2
LED3
LED4
APM0022
U1
IN12IN24IN37IN4
VC
5
Rc 4.7 kΩ
Rin1 1.8 kΩ
Rin2 1.8 kΩ
Rin3 1.8 kΩ
123
J1
9
Rin4 1.8 kΩ
ESD123ESD348ESD_C
6
C4
22 nF
C3
22 nF
C2
22 nF
C1
22 nF
456
2/4
COM1COM
CLT3-4BT6
10
INPUT
STEVAL-IFP008V1 Revision history
2 Revision history
Table 1. Document revision history
Date Revision Changes
07-Jul-2008 1 Initial release.
3/4
STEVAL-IFP008V1
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