HCPL-7710-000E Datasheet, PDF (16/18 Pages) AVAGO TECHNOLOGIES LIMITED – 40 ns Propagation Delay, CMOS Optocoupler

Power Supplies and Bypassing
The recommended DeviceNet application circuit is
shown in Figure 22. Since the HCPL-x710 are fully com-
patible with CMOS logic level signals, the optocoup­ler is
connected directly to the CAN transceiver. Two bypass
capacitors (with values between 0.01 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-
x710. For each 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.
ISO 5 V
GALVANIC
ISOLATION
BOUNDARY
TX0
0.01 µF
1 V_DD1
V_DD2 8
2 V_IN
7
HCPL-0710
3
V_O 6
4 GND₁
GND₂ 5
GND
RX0
0.01 µF
5 GND₂
GND₁ 4
6 V_O
3
HCPL-0710
7
V_IN 2
0.01
µF
0.01
µF
5V
LINEAR OR
SWITCHING
REGULATOR
+
V_CC
TxD
CANH
+
C4
0.01 µF
82C250
CANL
Rs
REF
RXD
GND
VREF
D1
30 V
+
5 V+
4 CAN+
3 SHIELD
2 CAN–
1 V–
C1
0.01 µF
R1
500 V
1M
8 V_DD2
ISO 5 V
V_DD1 1
5V
Figure 22. Recommended DeviceNet application circuit.
HCPL-0710 fig 21
Implementing PROFIBUS with the HCPL-x710
An acronym for Process Fieldbus, PROFIBUS is essen-
tially a twisted-pair serial link very similar to RS-485
capable of achieving high-speed communi­cation up to
12 MBd. As shown in Figure 23, 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.
PROFIBUS USER:
CONTROL STATION
(CENTRAL PROCESSING)
OR FIELD DEVICE
PBC
USER INTERFACE
FDL/APP
PROCESSOR
UART
OPTICAL ISOLATION
TRANSCEIVER
MEDIUM
Figure 23. PROFIBUS Controller (PBC).
16
HCPL-0710 fig 22