hcpl0721 AGILTRON Incorporated, hcpl0721 Datasheet - Page 15

• Manufacturer Part Number: hcpl0721
• Description: Propagation Delay, Cmos Optocouplers
• Manufacturer: AGILTRON Incorporated

Power Supplies and Bypassing
The recommended DeviceNet
application circuit is shown in
Figure 21. Since the HCPL-772X/
072X are fully compatible with
CMOS logic level signals, the
optocoupler is connected directly
Figure 21. Recommended DeviceNet Application Circuit.
Implementing PROFIBUS
with the HCPL-772X/072X
An acronym for Process Fieldbus,
PROFIBUS is essentially a twisted-
pair serial link very similar to RS-
485 capable of achieving high-speed
communication up to 12 MBd. As
shown in Figure 22, a PROFIBUS
Controller (PBC) establishes the
connection of a field automation
unit (control or central processing
station) or a field device to the
transmission medium. The PBC
consists of the line transceiver,
optical isolation, frame character
transmitter/receiver (UART), and
the FDL/APP processor with the
interface to the PROFIBUS user.
0.01 µF
0.01 µF
TX0
RX0
ISO 5 V
ISO 5 V
GND
1
2
3
4
5
6
7
8
V
V
GND
GND
V
V
DD1
IN
O
DD2
BOUNDARY
HCPL-772x
HCPL-072x
HCPL-772x
HCPL-072x
ISOLATION
GALVANIC
1
2
GND
GND
V
V
DD2
DD1
V
V
IN
O
2
1
8
7
6
5
4
3
2
1
5 V
0.01
0.01
µF
µF
to the CAN transceiver. Two
bypass capacitors (with values
between 0.01 and 0.1 F) 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
+
0.01 µF
Figure 22. PROFIBUS Controller (PBC).
MEDIUM
C4
PBC
TxD
Rs
(CENTRAL PROCESSING)
OPTICAL ISOLATION
CONTROL STATION
82C250
OR FIELD DEVICE
USER INTERFACE
PROFIBUS USER:
GND
V
5 V
TRANSCEIVER
CC
PROCESSOR
FDL/APP
UART
CANH
CANL
RXD
REF
+
VREF
REGULATOR
SWITCHING
LINEAR OR
30 V
D1
15
capacitor, the total lead length
between both ends of the
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.
0.01 µF
500 V
C1
+
5 V+
4 CAN+
3 SHIELD
2 CAN–
1 V–
R1
1 M