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ISO1I811T
Functional Description
3
Functional Description
The ISO1I811T is an electrically isolated 8 bit data input interface. This part is used to detect the signal states of
eight independent input lines according to IEC61131-2 Type 1/2/3 (e.g. two-wire proximity switches) with a
common ground (GNDBB).
3.1
Introduction
The current in the input circuit is determined by the switching element in state “0” and by characteristics of the input
stage in state “1”.
The octal input device is intended for a configuration comprising of two specified external resistors per channel,
as shown in Figure 5 “Typical Application for Sensor Input Type 1, 2, and 3” on Page 13 . As a result the
power dissipation within the package is at a minimum.
The voltage dependent current through the external resistor R EXT is compensated by a negative differential
resistance of the current sink across pins IxH and IxL, therefore input INx behaves like a constant current sink.
The comparator assigns level 1 or 0 to the voltage present at input IxH. To improve interference protection, the
comparator is provided with hysteresis. A status LED is connected in series with the input circuit (R EXT and current
sink).
If no LED is used an external resistor of 2 k Ω should be connected between IxL and GNDBB. The specified
switching thresholds may change if the resistor is used.
The LED drive short-circuits the status LED if the comparator detects “0”. A constant current sink in parallel with
the LED reduces the operating current of the LED, and a voltage limiter ensures that the input circuit remains
operational if the LED is interrupted, but the specified switching thresholds may change.
For each channel an adjustable digital filter is provided which samples the comparator signal at a rate selected by
the pins DS0 and DS1. The digital filter is designed to provide averaging characteristics. If the input value remains
the same for the selected number of sampling values, then the output changes to the corresponding state.
The control interface is compatible to standard microcontrollers. Furthermore a direct control mode can be
selected that allows the direct control of the outputs D0...D7 by means of the inputs I0H...I7H without any additional
logic signal. The μC compatible interfaces allows a direct connection to the ports of a microcontroller without the
need for other components. The diagnostic logic on the chip monitors the internal data transfer as well as the
sensor input supply. The information is sent via the internal coreless transformer to the pin ERR at the μC-Interface
side.
3.2
Power Supply
The IC contains two electrically isolated voltage domains that are independent from each other. The
microcontroller interface is supplied via pin VCC and the input stage is supplied via pin VBB. The different voltage
domains can be switched on at different times. Figure 3 shows the Start Up behaviour if both voltage domains are
powered by an external power supply. If the VCC and VBB voltage have reached their operating range and the
internal data transmission has been started successfully, the IC indicates the end of the Start Up procedure by
setting the pin ERR to logic high.
Data Sheet
11
Revision 2.0, 2012-06-14
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