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Sensor Conditioner with Compensation and Analog Line Driver
Three sensor PGAs with linearization and automatic offset correction

Bodenheim, Germany — July 2, 2010 — iC-TW3 is a signal conditioner with a line driver for a wide range of sensor applications. Precision instrumentation amplifiers with differential voltage inputs service three channels; their gain and offset correction can be configured individually. The gain is such that the setup can be adjusted to suit sensor signals in the millivolt range with -3 dB to 59 dB. An integrated regulator automatically triggers the dynamic gain and offset correction. Whether the temperature is measured internally or externally, gain and offset correction can be compensated for the individual temperature behavior of the sensor using an interpolation table.

The high-impedance inputs enable a number of different optical and magnetic sensors to be directly connected up to the device. A high-impedance input signal monitor detects open sensor pins and signals these as a LOW at an error output.


Press photo of iC-TW3
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  An automatic offset and gain regulator can be activated for encoder applications to ensure that the quality of the signal remains constant. The differential analog outputs can drive 1 Vpp to 100Ω and 2 Vpp to 1 kΩ and are short-circuit-proof.

The individual temperature behavior of a connected sensor can be compensated for by the settings in the interpolation table. With the help of 16 interpolating points, sensor temperature dependencies are compensated for using linear interpolation. Either an integrated or external temperature sensor is used as a point of reference. iC-TW3 is configured using the bidirectional one-wire interface. With an optical receiver on the one-wire interface, the device can also be calibrated in the field using optical pulses, despite its transparent seal.

The device is powered by a single voltage supply in the 3.3 V to 5.0 V range. iC-TW3 operates within an extended temperature range of -40°C to +125°C. Calibration parameters and the interpolation table are written to an external EEPROM and protected by a checksum; when the supply voltage is applied, they are automatically loaded via the I2C interface. Any errors detected are signaled to the external PLC/control unit as a LOW signal at an error output.

The circuit is housed in a QFN package with 32 pins and requires just 5 mm x 5 mm of space. iC-TW3 is in series production and available in large production quantities through the local distribution channel.

Demo board EVAL TW3_2D and PC adapter MB3U-I2C are available for evaluation and programming on a standard PC. A PC operating program can be downloaded free of charge. Customer programming of operational equipment can be supported by a device DLL.

Introducing iC-Haus

iC-Haus GmbH is one of the leading independent German manufacturers of standard iCs (ASSP) and customized ASiC semiconductor solutions. The company has been active in the design, production, and sales of application-specific iCs for industrial, automotive, and medical technology since 1984 and is represented worldwide. The iC-Haus cell libraries in bipolar, CMOS, and BCD technologies are fully equipped to realize the design of sensor, laser/opto, and actuator ASiCs.

The iCs are assembled either in standard plastic packages or using chip-on-board technology to manufacture complete microsystems, multichip modules and optoBGA™, the latter in conjunction with sensors. Further information is available at

Editorial Contact
Horst Huse
Tel: +49 8762 2850
Fax: +49 8762 2805

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