Demo board

AN2482

14/18

5

Demo board

5.1

Description of the PCLT-2A demo board

This demonstration board allows the PCLT evaluation. It can be easily inserted in a real

application, between sensors and digital bus controller. The LEDs monitors the logic state of

each PCLT input.

The demonstration board schematics are shown on Figure 13. and Figure 14. It has been

designed to present both opto-coupler and CMOS modes for type 2. The bill of material is

given in Table 3.

For the opto-coupler driving mode, the PCLT pin 10 has been grounded, while for the CMOS

driving mode the user has to supply the PCLT pin 10 through the OUTPUT_B connector.

The copper surface under the CLT device improves the thermal dissipation capability of the

exposed pad TSSOP14 package. The copper area (cooling pad) on the PCB demo board is

Figure 13.

Electrical diagram of opto-coupler diving mode

Figure 14.

Electrical diagram of CMO driving mode

Cc_A

33nF

0R

0

Cout

100nF

ISO1B

ILD213

D1

SM4005

Rin_A1

750R

1

2

3

4

OUTPUT_A

1

3

2

4

9

8

11

13

14

12

5

7

10

IN1

IN2

VC

REF

VDD

COMp

LED1

LED2

OUT1

OUT2

COMs

UA

PCLT-2A

Rref_A

10k

1

2

3

4

INPUT_A

Cin_A2

22nF

Dnw1

30k

Rin_A2

750R

ISO1A

ILD213

LED_A2

Cin_A1

22nF

LED_A1

Dnw2

30k

Rc_A

2.2k

VDD_A

VDD_A

VDD_A

Opto1

Opto2

Vdd

Gnd

Com

In1

In2

Vcc

Cc_A

33nF

0R

0

Cout

100nF

ISO1B

ILD213

D1

SM4005

Rin_A1

750R

1

2

3

4

OUTPUT_A

1

3

2

4

9

8

11

13

14

12

5

7

10

IN1

IN2

VC

REF

VDD

COMp

LED1

LED2

OUT1

OUT2

COMs

UA

PCLT-2A

Rref_A

10k

1

2

3

4

INPUT_A

Cin_A2

22nF

Dnw1

30k

Rin_A2

750R

ISO1A

ILD213

LED_A2

Cin_A1

22nF

LED_A1

Dnw2

30k

Rc_A

2.2k

VDD_A

VDD_A

VDD_A

Opto1

Opto2

Vdd

Gnd

Com

In1

In2

Vcc

-

Rref_B

UB

Rin_B1

750R

INPUT_B

LED_B1

OUTPUT_B

Out1

Out2

Vdd

Com

Com

In1

In2

Vcc

1

3

2

4

9

8

11

13

14

12

5

7

10

IN1

IN2

VC

REF

VDD

COMp

LED1

LED2

OUT1

OUT2

COMs

UB

PCLT 2A

Cin_B2

22nF

Rin_B1

750R

Cin_B1

22nF

1

2

3

4

INPUT_B

Rc_B

2.2k

LED_B2

LED_B1

Rin_B2

750R

1

2

3

4

OUTPUT_B

D2

SM4005

10k

VDD_B

VDD_B

Out1

Out2

Vdd

Com

Com

In1

In2

Vcc

Cc_B

33nF