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ISO1I811T
Functional Description
3.7
Parallel Interface Mode
The ISO1I811T contains a parallel interface that can be selected by pulling the SEL Pin to logic low state. It can
be directly controlled by the microcontroller output ports. ( Figure 9 , left side). The output pins D7:D0 are in state
“Z” as long as CS=1. Otherwise, new sensor data bits bits are sampled with the falling edge of RD and provided
at pins D7:D0.
The parallel interface can also be switched over to a direct control mode to observe continuously the changes of
the inputs I0H ... I7H by means of the corresponding outputs D7:D0 without additional logic signals. To activate
the parallel direct control mode pin CS and pin RD have to be connected both to ground (permanently as in
Figure 9 , right side or by the microcontroller ports). The Direct Control Mode is entered when at least CS and RD
are held low for t direct ( Table 14 ).
VCC
/CS
/RD
D0
D1
D2
D3
D4
D5
D6
D7
VCC
MCU (e.g. XE166)
or ASIC
VCC
/CS
/RD
D0
D1
D2
D3
D4
D5
D6
D7
VCC
MCU (e.g. XE166)
or ASIC
ISO1I811T
SEL
ISO1I811T
SEL
parallel _interface1.vsd
Figure 9
Parallel Bus Configuration for μC-Control-Mode (left) or Direct Control Mode (right)
The timing requirements for the parallel interface are shown in Figure 10 and in Table 14 .
/CS
t CSD
/RD
t CSS
t RDlow
t valid
t RD
t float
t direct
t valid
D7:D0
scan event
t scan
data
t scan
data
~8 scan cycles
data
data
data
direct control mode
Figure 10
Parallel Bus Timing
Data Sheet
15
Revision 2.0, 2012-06-14
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