Profichip VPC3+S - Example for the RS485 Interface

9 PROFIBUS Interface
110
Revision 1.04
VPC3+S User Manual
Copyright © profichip GmbH, 2012
9.2 Example for the RS485 Interface
To minimize the capacity of the bus lines the user should avoid additional
capacities. The typical capacity of a bus station should be 15...25 pF.
Figure 9-2: Example for the RS485 Interface
VCC_ISO
33
R9 22K
12
R35 330R
12
R36 680R
12
GND_ISO
R2 330R
1 2
C1
100n 0805
1 2
GND_ISO
GND_ISO
RTS
GND
VCC_ISO
R39 1K
12
SHIELD
VCC_ISO
30
VCC_ISO
VCC
R4 100K
12
RXD
GND
RTS
R40 470R
1 2
VPC3+C
GND_ISO
26
VCC
R34 680R
12
M24V
VCC_ISO
VCC
IC1 74AHCT1G00
1 2
4
53
B
GND_ISO
R3 100K
12
IC2
DS75176 SO08
1 2 4
6 7 8 5
3
R RE# D
A B
VCC
GND
DE
GND
C15 100n 0805
1 2
VCC_ISO GND_ISO
IC8 HCPL0710 SO08
1 2 4
7 6 8 5
VCC1
VI
GND1
NC VO VCC2 GND2
27
IC6
HCPL0710 SO08
1 2 4
7 6 8 5
VCC1 VI GND1
NC
VO
VCC2
GND2
TXD
IC7
HCPL0601 SO08
2 3
7 6 8 5
A K
VE
VO
VCC
GND
GND_ISO
A
X1 SUBD_BU9
11 10
1 6 2 7 3 8 4 9 5
P24V
GND_ISOXCTS
GND
VCC_ISO
VCC_ISO