Bullet Sensors & Transducers e-Digest, Vol. 86, Issue 12, December 2007: Product News

    (ISSN 1726- 5479)


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Sensor Signal Conditioning IC Features 14-bit A-to-D


Servoflo is pleased to announce a new sensor signal conditioning IC from ZMD of Germany. As part of the RBic-LiteTM signal conditioning family of IC's, the ZMD31014 is optimized for microcontroller-based sensor systems. Developed for correction of resistive bridge sensors, the ZMD31014 combines high accuracy amplification with analog-to-digital conversion of a differential input. The feature-rich CMOS device is ideal for all types of microcontroller-based portable equipment, such as white goods, wireless pressure transmitters, medical infusion pumps, wearable blood-pressure meters and temperature measurement equipment.


To deliver the highest possible accuracy, the ZMD31014 features a 14-bit low-noise analog-to-digital converter, four times more precise than the 12-bit units found in most devices in this class. On-chip digital logic provides sophisticated second-order error correction for temperature offset, drift, and non-linearity. Performing all of the error correction in the ZMD31014 simplifies designing the rest of the system and helps minimize the overall bill of materials as well as the overall system power consumption. The ZMD31014 uses 40% less power than previous designs during operation, and features a standby mode of less than 2mA to further reduce current consumption in battery powered equipment.


The ZMD31014 supports the two most widely used IC interconnect busses, I2C and SPI. These busses support an addressing scheme so that multiple sensors can be used in the same design. The ZMD31014's on-chip diagnostics includes both a bridge-connection check and a bridge short-circuit detection, allowing the microcontroller to continuously test the entire sensor system and improve the safety and reliability of the system. In addition, the ZMD31014 has a 32-bit programmable customer ID field. This feature lets system designers customize sensor modules for specific purposes. For example, it can be used to determine if the correct sensor is attached to a system, or to uniquely identify each system in the field, thus providing easier field maintenance and diagnostics.


Using ZMD's unique one-shot/single-pass calibration, the microcontroller can custom-calibrate the sensor in very short time, typically a fraction of a second. The microcontroller can even recalibrate in-system if desired. Eliminating the need for external trimming components reduces the overall bill of materials as well as manufacturing costs and shortens time to market.


The ZMD31014 operates on supply voltages from 2.7 to 5.5 Volts and over a temperature range of -40C to 125C. Accuracy is 0.1% of full-scale over the range of 0C to 70C, and 0.25% over the full temperature range. Power consumption during normal operation is as low as 150 mA while standby current is below 2 mA.

Sensor Signal Conditioning IC


ZMD's RBic-LiteTM development kit supports the ZMD31014 with a range of evaluation and calibration tools that demonstrate the ease of use and the single pass calibration capabilities of the mixed-signal throughput used in the IC.


Sold exclusively in North America and South America by Servoflo, the ZMD31014 is sampling now and will be available for production Q2 of 2008. It comes in an SOP8 package. Pricing is available upon request.




David Ezekiel

Servoflo Corporation

75 Allen Street, Lexington, MA, 02421

Tel: 781-862-9572

E-mail: david@servoflo.com



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