Universal I/O Interface

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iC-GD is an interface IC with two independent channels 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 20mA with a resolution of 14 bits.

When configured as an analog input, a 14-bit ADC processes differential voltages in the range of ±10V, ±1V, ±100mV, ±10mV or currents in the range of ±20mA 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 configurable input filter. Additionally a fast mode with an 8 kHz limit is available.

Pt temperature sensors (in 2-, 3- and 4-wire technology) and various thermocouples can also be connected 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 independent of voltage and current measurement or voltage output.

A variety of monitoring functions are available, including supply voltage, cable breaks and overload conditions 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 identification.

Symmetry Electronics is an authorized iC-Haus distributor.


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Two channels, each configurable as input or output
Low-side and high-side switches with up to 500mA per channel, current limitation, current measurement, status messages, cable break detection, freewheeling and reverse polarity protection, paralleling of both channels possible
Output of 10 V or 0/4...20mA with 14 bit resolution
Measurement of 10 V, 1 V, 100mV, 10mV, 20 mA, 4...20mA with 14 bit resolution
Input for Pt100, Pt1000 temperature sensors
Multifunctional 32 bit counter
Digital output with pulse-width modulation option
Internal temperature measurement with 1 K resolution
SPI interface
Calibration and configuration by external EEPROM via serial interface
Error message with hysteresis at overtemperature, overload and undervoltage
Shutdown of the outputs in case of error
Inputs/outputs protected against ESD

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