SGS Thomson Microelectronics CLT3-4BT6-TR, CLT3-4BT6 Datasheet
®
CURRENT LIMITED OVER-VOLTAGE PROTECTED
APPLICATIONS
Industrial Automation
■
Programmable Logic Controller
■
Communication field bus nodes
■
Peripheral Input / Output modules
■
Machine tool interface
■
CLT3-4BT6
QUAD DIGITAL TERMINATION
FEATURES
4 channels topology
■
Wide range input DC Voltage:
■
VI= - 0.3 to 30V with RI=0
■
■ V
= - 30 to 35V with RI= 1.2kΩ
I
■ Low side configuration with common ground
Current limiter:
■
■ I
= 3mA
GEN
■ Input current limiter activation voltage < 5V
■
Temperature compensated operation
■
Opto-coupler drive:
■
No coupler activation below 1.5 mA input current
■
Input protection (RI= 1.2KΩ):
■
IEC61000-4-2 electrostatic discharge ESD, Class 3
❏
In contact, ±6kV; in air, ±8kV
❏
Level B: temporary disruption; no change of opto-coupler state
■
IEC61000-4-5 voltage surge, Class 3
❏
± 1000V with 42Ω serial resistor in differential mode
❏
Level B: temporary disruption
■
IEC61000-4-4 transient burst immunity
❏
± 4kV peak voltage; 5kHz repetitive rate
❏
Level A: fully functional
■
Operating ambient temperature: - 25 to 85°C
TSSOP20
BENEFITS
■
Reduced overall dissipation
■
Compact with high integration
■
Enables input to meet type 1 characteristic of IEC61131-2 standard
■
Compatible operation with 2 and 3 wires proximity sensor according EN60947-5-2 standard
■
Insensitive to the on state sensor impedance
■
Surface Mount Package for highly automated assembly
■
Enhanced functional reliability
August 2002 - Ed: 4A
1/10
CLT3-4BT6
IEC61000-4 STANDARD ROBUST APPLICATION DIAGRAM
1
COM
V
IN
IN
1
1
1
ESD
IN
2
2
2
V
C
V
C
C
C
ESD
IN
3
COM
12
12
12
C
C
C
24V
SUPPLY
V
V
I
I
2 wires sensor
R
I
R
3 wires sensor
V
CC
I
R
C
R
I
Contact switch
COM
OUT
OUT
COM
COM
OUT
1
1
1
12
12
12
2
2
2
3
3
3
2 wires sensor
R
INPUT TERMINATION BLOCK DIAGRAM
Vc
BIASING
CIRCUIT
I
1
I
2
I
3
0.25xI
CURRENT LIMITER I
CURRENT LIMITER I
0.25xI
0.25xI
CURRENT LIMITER I
ESD
ESD
C
IN
1
12
IN
2
IN
3
ESD
Volt Prot
ESD
OVER
VOLTAGE
PROTECTION
ESD
OVER
VOLTAGE
PROTECTION
ESD
OVER
VOLTAGE
PROTECTION
I
TO COMPARATORS
0.75xI
LIM
LIM
LIM
0.75xI
LIM
0.75xI
LIM
LIM
ESD
IN
4
COM
LIM
LIM
LIM
COM
34
OUT
COM
OPTO COUPLER DRIVER
1.5mA
1.5mA
OPTO COUPLER DRIVER
OPTO COUPLER DRIVER
1.5mA
34
4
COM
OUT
1
I
1
COM
12
I
2
OUT
2
OUT
3
I
3
2/10
ESD
34
IN
4
ESD
OVER
VOLTAGE
PROTECTION
I
4
CURRENT LIMITER I
0.25xI
LIM
0.75xI
LIM
COM
34
LIM
1.5mA
I
4
OPTO COUPLER DRIVER
OUT
4
CLT3-4BT6
FUNCTIONAL DESCRIPTION
TheCLTx-4isaquadruple input digitalterminationdevicedesignedfor 24 V DCautomationapplications.It
achieves the front-end circuitry of a digital input module (I/O) in industrial automation, and drives an
isolating opto-coupler.
Available in a four channels configuration, it offers a high-density termination by minimizing the external
components count. It is housed in a TSSOP20 surface mount package to reduce the printed board size.
Made of an input voltage protection, a serial current limiting circuit and an opto-coupler driver, each
channel circuit terminates the connection between the logic input and the associated high side sensor or
switch.
The CLT3-4 isa3mAquad channel device compatible the type 1 characteristics of the IEC61131-2
standard.
Each input voltage clamping block protects the module input against electromagnetic interferences such
as those described in the IEC61131-2 standard and IEC61000-4-2 (ESD), 4-4 (transient burst), 4-5
(voltage surge) standards. The supply input is also designed with such a protection structure.
The current limiting circuit connected between the input and the output pins is compensated all over the
temperature range. Thanks to its low tolerance, the current limitation allows reducing drastically the
dissipation of the input compared to a resistive input: the overall module requires less cooling capability
and becomes smaller.
The outputblockofeachterminationchannelcontrolstheoperationof anopto-coupler that is enabled by a
Light Emitting Diode.
When the input current is less than 1.5 mA, this output circuit derivates the input current to maintain the
opto-coupler off.
The original structure of the CLT limiter allows its activation threshold to be low and insensitive to the
output voltage up to a maximum value of 2.0 V.
When the CLT input voltage V
useof a reverse diodeand a serial resistor R
(3/4) is higher than 1.5 mA. The whole termination channel including the opto-coupler is on.
is higher than 5 V, or the module input voltage Vi higher than 11 V with the
IN
=1.2 kΩ, the outputcurrent that is a shareof the input current
I
ABSOLUTE RATINGS (limiting values)
Symbol Pin Parameter name & conditions Value Unit
V
CC
(1)
V
I
I
IN
V
C
IN Input steady state voltage, RI=0kΩ - 0.3 to 30 V
IN Input maximum forward current,
Supply steady state voltage, RC=0kΩ - 0.3 to 30 V
Supply steady state voltage, R
Input steady state voltage, R
Input repetitive pulse voltage, R
Input repetitive pulse voltage,
RI= 1.2kΩ,RC= 4.7kΩ
(2)
= 4.7kΩ - 0.3 to 35 V
C
= 1.2kΩ - 0.3 to 32 V
I
= 1.2kΩ - 0.3 to 35 V
I
-30to30 V
5mA
RI= 1.2kΩ,RC= 4.7kΩ
Input maximum reverse current,
RI= 1.2kΩ,RC= 4.7kΩ
V
OM
I
OM
T
AMB
T
J
Note 1: VI=VIN+RIxIIN;VIN= voltage at the input pin itself
Note 2: according to test diagramon figure 8, this case covers especially the reverse polarity operation of one input.
OUT Maximum output steady state voltage 2.5 V
OUT Output current - 4 to 4 mA
AII Operating ambient temperature - 25 to 85 °C
Operating and storage junction temperature - 25 to 150 °C
(2)
20 mA
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