AN2482

PCLT Description

5/18

1.4

Protection against reverse polarity of power supply

A reverse diode should be connected between the module ground connection and the

common pin COM of the PCLT2A device to protect the module against spurious reverse

supply connection (refer to IEC 6131-2 section 5.3.3.1)

1.5

Opto-coupler and CMOS modes

minimum current of 35 µA powered by the MOD pin.

Figure 4.

Isolated digital input diagram with opto-coupler driving output

Figure 5.

Unisolated digital input diagram with programmable CMOS output

IN

1

COM

P

IN

2

V

C

REF

OUT

1

OUT

2

COM

S

LED

2

LED

1

MOD

PCLT -2A

3 wires sensor

2 wires sensor

R

I

R

I

R

C

V

IN

V

I

V

CC

V

C

R

REF

Reverse polarity

1N4007

C

I

C

I

C

C

IN

1

COM

P

IN

2

V

C

REF

OUT

1

OUT

2

COM

S

LED

2

LED

1

MOD

IN

1

COM

P

IN

2

V

C

REF

OUT

1

OUT

2

COM

S

LED

2

LED

1

MOD

IN

1

COM

P

IN

2

V

C

REF

OUT

1

OUT

2

COM

S

LED

2

LED

1

MOD

PCLT -2A

3 wires sensor

2 wires sensor

R

I

R

I

R

C

V

IN

V

I

V

CC

V

C

R

REF

Reverse polarity

1N4007

C

I

C

I

C

C

IN

1

COM

P

IN

2

V

C

REF

OUT

1

OUT

2

COM

S

LED

2

LED

1

MOD

IN

1

COM

P

IN

2

V

C

REF

OUT

1

OUT

2

COM

S

LED

2

LED

1

MOD

IN

2

OUT

1

OUT

2

LED

2

LED

1

V

C

REF

MOD

PCLT -2A

V

SS

V

DD

IN

2

BUS

CONTROLLER

V

SS

V

DD

IN

2

BUS

CONTROLLER

Supply voltage

protection

SM15T39

3 wires sensor

2 wires sensor

R

I

R

I

V

IN

V

I

V

CC

V

C

C

I

C

I

C

C

Supply voltage

protection

SM15T39

3 wires sensor

2 wires sensor

R

I

R

I

V

IN

V

I

V

CC

V

C

C

I

C

I

C

C

Reverse polarity

Reverse polarity

1N4007

1N4007

IN

2

OUT

1

OUT

2

LED

2

LED

1

V

C

REF

MOD

PCLT -2A

IN

2

OUT

1

OUT

2

LED

2

LED

1

V

C

REF

MOD

PCLT -2A

V

DD

V

DD

GND

V

CC

V

CC

SUPPLY

5V

IN

2

OUT

1

OUT

2

LED

2

LED

1

V

C

REF

MOD

PCLT -2A

V

SS

V

DD

IN

2

BUS

CONTROLLER

V

SS

V

DD

IN

2

BUS

CONTROLLER

Supply voltage

protection

SM15T39

3 wires sensor

2 wires sensor

R

I

R

I

V

IN

V

I

V

CC

V

C

C

I

C

I

C

C

Supply voltage

protection

SM15T39

3 wires sensor

2 wires sensor

R

I

R

I

V

IN

V

I

V

CC

V

C

C

I

C

I

C

C

Reverse polarity

Reverse polarity

1N4007

1N4007

Reverse polarity

Reverse polarity

1N4007

1N4007

1N4007

1N4007

IN

2

OUT

1

OUT

2

LED

2

LED

1

V

C

REF

MOD

PCLT -2A

IN

2

OUT

1

OUT

2

LED

2

LED

1

V

C

REF

MOD

PCLT -2A

V

DD

V

DD

V

DD

V

DD

GND

V

CC

V

CC

V

CC

V

CC

SUPPLY

5V

SUPPLY

5V