HCPL-0720 datasheet(13/18 Pages) HP

13 / 18 page

Implementing CC-Link with the

HCPL-772X/072X

CC-Link (Control and

Communication Link) is

developed to merge control and

information in the low-level

network (field network) by PCs,

thereby making the multivendor

environment a reality. It has data

control and message-exchange

function, as well as bit control

function, and operates at the

speed up to 10 Mbps.

Figure 17. Recommended CC-Link application circuit.

Power Supplies and Bypassing

The recommended CC-Link circuit

is shown in Figure 17. Since the

HCPL-772X/072X are fully

compatible with CMOS logic level

signals, the optocoupler is

connected directly to the

transceiver. Two bypass

capacitors (with values between

0.01

µF and 0.1 µF) are required

and should be located as close as

possible to the input and output

power supply pins of the HCPL-

772X/072X. For each capacitor,

the total lead length between both

ends of capacitor and the power

supply pins should not exceed 20

mm. The bypass capacitors are

required because of the high

speed digital nature of the signals

inside the optocoupler.

VDD1

HCPL-7720#500

0.1 µ

GND1

VDD2

GND

GND1

RD1

10 K

VDD1

(5 V)

0.1 µ

GND2

VDD2

(5 V)

VDD2

HCPL-7720#500

0.1 µ

GND

VDD1

GND

0.1 µ

VOE

HCPL-2611#560

–

0.1 µ

MPU

BOARD

OUTPUT

390

HC14

1 K

VOE

HCPL-2611#560

GND

–

0.1 µ

SDGATEON

390

HC14

1 K

10 K

GND

VDD

VCC

GND

SN75ALS181NS

FIL

SLD

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