IC-GD Datasheet, PDF (19/55 Pages) IC-Haus GmbH – UNIVERSAL I/O INTERFACE

iC-GD
UNIVERSAL I/O INTERFACE
FUNCTION DESCRIPTION
Power supply
The iC is supplied via the following pins:
preliminary
Rev A1, Page 19/55
Power Supply
Pin Name
Function
VB
positive analog supply
VNB negative analog supply
VCC positive digital supply
VDA positive power supply
GNDP
power ground
GNDL
logic ground
GNDA
analog ground
Range
14.5...16 V
-16...-14 V
3.135...5.25 V
18...36 V
0V
0V
0V
typ. Value
+15 V
-15 V
3.3 or 5 V
24 V
0V
0V
0V
Table 4: Power Supply
The pins GNDP, GNDL and GNDA are to be connected
externally via a neutral point.
Default state of IO pins
• IAx: Configured as digital type 3 inputs according to
DIN/EN 61131-2
• UPx: Configured as voltage outputs with 0 V vs. UNx
• UIx: Pulldown current vs. VNB
• UNx: Pulldown current vs. GND
Digital inputs IAx
For the digital inputs several pull-down currents accord-
ing to DIN/EN61131-2 and a pull-up current can be set.
The status of the digital inputs can be indicated via
LEDs to ground at the pins LEDx even if the iC is not
supplied with voltage. In order to reduce power dissi-
pation, the pull-down current flows through the LEDs to
ground. If no LED is used, the corresponding LEDx pin
must be connected to ground.
Digital outputs IAx
The digital outputs can be configured as low-side, high-
side or push-pull drivers. If they are not configured as
digital outputs they remain high-impedance.
The outputs are current-limited and switch off when the
upper over-temperature limit T2 is reached. When the
lower over-temperature limit T1 is exceeded, only the
channel with excessive ouput current is disconnected.
A freewheeling circuit for inductive loads limits the pos-
itive voltage versus GNDP and the negative voltage
versus VDA.
Diagnostics allow measuring and monitoring the output
current in the output transistors directly. With appro-
priately configured pull-up or pulldown currents and
voltage comparators, the status (output on or off, line
break or short circuit to GNDP or VDA) can be detected.
Analog inputs (UPx, UIx)
Table 5 shows the possible measuring ranges. The
maximum ratings marked by (*) only apply, if the chan-
nel is configured as plain voltage input (IO_SEL_x = VI).
Then the entire range is valid. If the channel is con-
figured as temperature sensor (IO_SEL_x = TM), the
maximum ratings in table 10 apply. The inputs include
cable-break detection. The current inputs are current
limited to protect the measuring resistor. In addition,
it is possible to implement floating voltage or current
measurements (e.g. floating thermocouples).
The individual measuring range must be calibrated to
reach the specified accuracy. The accuracy accord-
ing to the characteristics S02 to S05 is summarized in
table 6.