SN65HVS883
ZHCSFI0 –SEPTEMBER 2016
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9.1.4 Cascading for High Channel Count Input Modules
Designing high-channel count modules require cascading multiple SN65HVS883 devices. Simply connect the
serial output (SOP) of a leading device with the serial input (SIP) of a following device without changing the
processor interface.
HOST
ISO7241
CONTROLLER
4 X SN65HVS883
OUTA
OUTB
OUTC
IND
INA
INB
LOAD
STE
INC
SCLK
SOMI
OUTD
SERIALIZER
SERIALIZER
SERIALIZER
SERIALIZER
Figure 22. Cascading Four SN65HVS883 for a 32-Channel Input Module
NOTE
When daisy-chaining multiple devices, the maximum operating rate (CLK pulse width) may
need to be restricted in order to maintain minimum set-up/hold timing relationships
between the serial data (SIP/SOP) and the CLK line.
9.2 Typical Application
SM15T39CA
24 V
5 V
5 V-ISO
(Logic) 24 V1
SM15T39A
4.7 nF
2 kV
Isolated
DC / DC
(Sensors) 24 V2
4.7 nF
2 kV
220 nF
100 V
220 nF
100 V
Power
Supply
GND2
GND1
0 V
0 V-ISO
4.7 nF
2 kV
56 Ω
MELF
FE
220 nF
100 V
BYM10-1000
Z2SMB36
2.2 mF
60 V
1 mF
0.1 mF
SN65HVS883
V24
5VOP
CE
1.2 kW
MELF
220 nF
60 V
ISO7242
VCC2
HOST
IP0
VCC1
CONTROLLER
22 nF
100 V
S0
RE0
SIP
EN2
EN1
INA
VCC
LD
OUTA
OUTB
INC
LOAD
SCLK
INT
CLK
CHOK
SOP
DB0
DB1
INB
1.2 kW
MELF
IP7
OUTC
OUTD
GND1
22 nF
100 V
S7
RE7
IND
MISO
DGND
RLIM
FGND
GND2
24.9 kW
Copyright © 2016, Texas Instruments Incorporated
Figure 23. Typical Digital Input Module Application
18
Copyright © 2016, Texas Instruments Incorporated
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