IC-LV_16 Datasheet, PDF (13/15 Pages) IC-Haus GmbH – 5-BIT OPTO ENCODER

iC-LV
5-BIT OPTO ENCODER
APPLICATION INFORMATION
Rev C1, Page 13/15
If a stable SSI output level is required all MSBs used
in the synchronization chain must be switched to the
relevant outputs on the first falling edge. The iC-LV
chain should also be synchronized in its entirety before
the first rising edge of SCLK.
To guarantee functionality it is sufficient for synchro-
nization to be completed by the second falling edge
of SCLK; SOUT is, however, then not stable for half a
clock cycle. Despite this limitation it is also possible to
synchronize with MSBs which are only output on the
first rising SCLK edge (e.g. from external SSI-compati-
ble devices).
In the synchronization modes all of the information is
output after just 4 rising clock edges per chained iC-LV.
In keeping with the required SSI clock frequency the
time span of the internal monoflop, used to detect idle
times on the clock line, can be adjusted by externally
connecting pin RC to an RC network. Should pin RC
remain unconnected, tmf (Electrical Characteristics No.
603) is taken as the internal time span.
Note: iC-LV stores input data received at SERIN on the
falling edge of SCLK and outputs data via SOUT on the
rising edge of SCLK.
Figure 4 gives signal patterns for a cascade of three
iC-LVs.
SCLK
SERIN
...
1
2
...
11
12
SOUT:
- Sync Out -
1
- SSI Out -
1
- No Sync -
1
2
...
11
12
2
...
11
12
2
...
14
15
Figure 4: SOUT in the various modes of operation.
REVISION HISTORY
Rel. Rel. Date^∗ Chapter
A3 2007-08-30 ...
Modification
Rel. Rel. Date^∗ Chapter
B1 2014-07-09 PACKAGES, THERMAL DATA
ELECTRICAL CHAR.
DESCRIPTION OF FUNCTIONS
REVISION HISTORY
Modification
optoQFN package supplemented
Item 704 supplemented
Figure 3 corrected
Chapter supplemented
Rel. Rel. Date^∗ Chapter
C1 2016-01-18 PACKAGING INFORMATION
ELECTRICAL CHAR.
∗ _{Release Date format: YYYY-MM-DD}
Modification
Footnote on mandatory wiring added to pad layout
Item 007: conditions corrected, entry for VDD < 4.5 V supplemented
Item 301: max. value supplemented
Item 303: min. and max. value
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