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ISO1I811T
Functional Description
VBB Missing Voltage
VBB UVLO
VCC UVLO
VC C
1
t ER Rstart
/ERR
0
tds_startup_timing_STD. vsd
Figure 3
3.3
Start-Up
Internal Oscillator
An external resistor has to be connected to ROSC pin and allows the adjustment of the frequency as shown in
Figure 4 .
160
140
120
100
80
60
40
20
0
50
70
90
110
130
150
170
190
210
230
Resistance at Rosc (KOhm)
Figure 4
Internal Frequency Setting at ROSC
The internal oscillator provides the scan clock for the sampling of the sensor data as well as for the internal digital
averaging filters. Therefore the filter times as defined in the Table 10 for the typical frequency of 125 KHz will
change accordingly. As an example, it is possible to define filter time longer than 20 ms by reducing the internal
oscillator frequency.
3.4
Sensor Input
The sensor input structure is shown in Figure 5 . Due to its active current a V-I-characteristic as shown in Figure 6
is maintained. This V-I-curve is well within the IEC 61131 standard requirements of Type 1 and Type 3 sensors,
respectively. Type 2 sensors are supported as well with the restriction that two input channels have to be used in
parallel i.e. only 4 channels are available.
It is recommended to choose for the external resistors Rext, RV, RLED an accuracy of 2 % (< 5% is mandatory)
otherwise the V/I-characteristic shown in Figure 6 cannot be guaranteed.
Data Sheet
12
Revision 2.0, 2012-06-14
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