IC-GD datasheet(2/55 Pages) ICHAUS

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iC-GD

UNIVERSAL I/O INTERFACE

Rev A1, Page 2/55

DESCRIPTION

iC-GD is an interface IC with two independent chan-

nels each of which is configurable for a variety of

measurement and control signal transmission tasks.

Both channels, each with 4 pins, can be addressed

via the SPI interface and configured by an external

EEPROM or SPI.

When configured as low-side or high-side drivers,

each channel is capable of high driving currents (at

least 500 mA) with integrated current measurement

and current limitation. Drivers are short-circuit proof

by shut-down in case of overtemperature or overload.

The high/low-side drivers can be connected in parallel

for higher currents and feature an active freewheeling

circuit and reverse polarity protection.

Operated as an analog output, the iC-GD provides

voltages in the range of ±10 V or currents in the range

of 0 or 4 to 20 mA with a resolution of 14 bits.

When configured as an analog input, a 14-bit ADC

processes differential voltages in the range of ±10 V,

±1 V, ±100 mV, ±10 mV or currents in the range of

±20 mA or 4 to 20 mA.

The analog inputs can be bandwidth-limited over a

wide range from 2 kHz to 0.5 Hz by means of a con-

figurable input filter. Additionally a fast mode with an

8 kHz limit is available.

Pt temperature sensors (in 2-, 3- and 4-wire tech-

nology) and various thermocouples can also be con-

nected to provide the absolute temperature with a

resolution of 0.1 K after calibration.

After calibration an integrated temperature sensor

also supplies the absolute chip temperature with a

resolution of 1 K.

In digital input mode, two 32-bit counters are available

which can be configured for counting direction, start

value, end value or used in combination as a single

gated counter. An LED signals the state of the digital

input even without the iC-GD being powered.

The digital output can be operated as a pulse-width

modulator with a resolution of either 125 ns or 16 µs

and a cycle time of up to 8.192 ms or 1.048 s.

If all pins of a channel are not used, it is possible

to use certain functions of a channel simultaneously.

Thus, for example, the high-side or low-side driver or

the digital input respectively can be operated indepen-

dent of voltage and current measurement or voltage

output.

A variety of monitoring functions are available, includ-

ing supply voltage, cable breaks and overload condi-

tions to provide comprehensive system diagnostics.

The iC-GD is calibrated via SPI and via the relevant

pins.

Each IC holds a unique serial number for identifica-

tion.

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