IC-GD datasheet(19/55 Pages) ICHAUS

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iC-GD

UNIVERSAL I/O INTERFACE

Rev A1, Page 19/55

FUNCTION DESCRIPTION

Power supply

The iC is supplied via the following pins:

Power Supply

Pin Name

Function

Range

typ. Value

positive analog supply

14.5...16 V

+15 V

VNB

negative analog supply

-16...-14 V

-15 V

VCC

positive digital supply

3.135...5.25 V 3.3 or 5 V

VDA

positive power supply

18...36 V

24 V

GNDP

power ground

0 V

GNDL

logic ground

0 V

GNDA

analog ground

0 V

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.

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