EM Microelectronic integrated temperature sensor

April 30, 2013  by  


Suited for automatic vehicle identification

EM Microelectronic, the semiconductor company of the Swatch Group, announced the EM4325V11, a battery-assisted passive (BAP) RFID chip with a calibrated temperature sensor.

The chip enables accurate remote temperature monitoring using industry standard EPC™ Gen2 wireless protocol. Temperature data logging can be implemented with a companion microcontroller connected to the EM4325V11 via a standard SPI interface.

Automatic vehicle identification

According to the company, BAP technology avoids the pitfalls of both passive and active RFID in automatic vehicle identification (AVI) applications. It is less expensive than active RFID but offers excellent read performance at high speeds and at long range, even in wet conditions. In BAP mode, the EM4325V11 offers -31dBm read sensitivity at chip level, which corresponds to open-field read ranges in excess of 50 meters.

Integrated temperature sensor

The integrated temperature sensor monitors ambient temperature from -40°C to +60°C with 9-bit measurement accuracy of up to 0.5% over the full temperature range. In pure passive mode the temperature sensor can be used for field-powered snapshot readings, but the chip can also be programmed to perform self-monitoring with user-programmable alarm conditions (upper and lower temperature thresholds).

Self-monitoring operation is supported with an on-board real-time clock (RTC) to control sampling intervals and provide a timestamp for alarm conditions. The sensor may be configured to provide Simple Sensor Data reporting according to the data formats defined in ISO/IEC 18000-6 and ISO/IEC 24753.


The EM4325V11 is available in die form and in a JEDEC-standard 8-pin TSSOP. More information about the circuit and development kit is available at http://www.emmicroelectronic.com/Products.asp?IdProduct=295 For samples and details contact info@emmicroelectronic.com.

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