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ISO1I811T
Functional Description
3.5
Common Error Output
The input (VBB) missing voltage status which is transmitted via the integrated coreless transformer to the output
block and the internal data transmission monitoring information are evaluated in the common error output block,
see Figure 7 .
In case of an internal data transmission error the data bits are replaced by the last valid transmission. Moreover,
if four consecutive erroneous data transmissions (TE1=1, see Figure 7 ) occur, an internal error signal TE4 (see
Figure 7 ) is set. The average filters are reset. This status is held until four consecutive error-free transmissions
(TE1=0) occur. An example timing diagram is shown in Figure 7 . The internal W4S (Wait for Sense) signal
indicates whether the Sense Input interface is operating properly or not.
This internal error signal is OR-wired with the current VBB missing voltage status. Since the output error signal is
active low, the OR-wired result is negated.
The output stage at pin ERR has an open drain functionality with a pull-up resistor. See Table 12 for the electrical
characteristics.
scan trigger
transmission error
VBB missing voltage
TRIG
TE1
filter
MV
TE4
N
O
R
/ERR
TRIG
TE1
TE4
0
1
2
3
0
1
2
3
Wait for Sense
W4S
Figure 7
3.6
Common Error Output
Programmable Digital Input Filter
The sensor data bits can be filtered by a configurable digital input filter. If selected, the filter changes its output
according to an averaging rule with a selectable average length. When the sensor state changes without any
spikes and noise the change is delayed by the averaging length. Sensor spikes that are shorter than the averaging
length are suppressed. Figure 8 shows the behavior of the filter.
scan trigger
filter input
filter state
filter output
N-1
N-2
N-3
2
1
0
averaging time
output is 1
output is
unchanged
output is 0
Figure 8
Digital Filter Behavior
The averaging length is selected using the configuration pins DS0 and DS1. See Table 10 for the different setting
options including filter bypass. The filters are dimensioned for the nominal internal sampling f scannom . The
corresponding filter delays can be adjusted by changing the oscillator frequency i.e. by tuning the resistor at the
ROSC pin.
Data Sheet
14
Revision 2.0, 2012-06-14
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