HCPL-0560 Datasheet, PDF(13/16 Page) Agilent(Hewlett-Packard) – Dual Channel Bi-directional High Speed Optoisolators

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HCPL-0560 Datasheet, PDF (13/16 Pages) Agilent(Hewlett-Packard) – Dual Channel Bi-directional High Speed Optoisolators

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Shown in Figures 15 and 16 is the

driver interface circuit using a NPN

(2N3904) general-purpose

transistor. Since, in a VCC common

configuration (HCPL-0560) LED

anode for one channel is connected

to the VCC pin of the second

channel, LED input current now

becomes a direct function of the

power supply voltage. Thus, care

must be taken to use an

appropriate current limiting

resistor, the value of which will be

a function of the common supply

voltage.

Table A below lists the

recommended RF (series drive

current limiting resistor) and RL

(output pull-up load resistor) for

the HCPL-0560 optoisolator. The

RF values chosen will limit the

input drive current at the minimum

recommended value of 16 mA. The

RL value chosen at each supply

voltage will guarantee an output

current does not exceed the

maximum current consistent with

the minimum specified CTR of

15%. Similarly, Table B lists the

recommended RF and RL for the

HCPL-0561 configuration.

Table A. HCPL-0560 Input/Output Current Limiting Resistors

VCC1 or VCC2

RF (â¦)

RL (â¦)

188

1.9

500

4.0

812

6.0

1125

8.2

Table B. HCPL-0561 Input/Output Current Limiting Resistors

VCC1 or VCC2

RF (â¦)

218

RL (â¦)

1.9

531

4.0

843

6.0

1156

8.2

Figure 17 shows an RS-232-E

isolated interface using the

HCPL-0560. The LED is shown

driven with a NPN transistor

(2N3904). The input series

current limiting resistor RF

(200 â¦) sets the LED current at

16 mA minimum required for the

optoisolator. The pull-up resistor

RL (1.9 kâ¦) assures that the

optoisolator output will saturate

and conduct current consistent

with the minimum CTR of 15%.

The output of the optoisolator is

shown to interface directly with

DS14C232 (transceiver for

RS-232-E) driver input. The

output of the transceiver is shown

to drive the input of NPN

Transistor (2N3904). This NPN

transistor is configured to drive

the LED of the optoisolator.

Similarly Figure 18 shows an

RS-232-E isolated interface using

the HCPL-0561. Again, NPN

transistor 2N3904 is used to drive

the LED of the optoisolator. And

the output of the optoisolator is

directly connected to the driver

input of the transceiver

(DC14C232).

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