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Sensors/MEMS??

Temperature sensor operates on low supply range

Posted: 23 May 2006 ?? ?Print Version ?Bookmark and Share

Keywords:Dallas Semi? DS75LV? temperature? sensor?

Dallas Semiconductor has introduced its latest digital temperature-sensor, the DS75LV, which operates over a 1.7V to 3.7V supply-voltage range. The DS75LV is suitable for low-power, battery-operated systems and those using low supply-voltage rails.

The DS75LV is calibrated to an accuracy of 2C (max) over its entire voltage-supply range and -25C to 100C temperature range. It is 3C (max) accurate over its full -55C to 125C operating-temperature range. The device is function, pin and software compatible with DS75.

The product provides user-selectable 9-/10-/11-/12bit digital temperature readings that translate to resolutions between 0.5C (9bit) and 0.0625C (12bit). A thermostat functionality with user-defined trip points allows the user to customize the threshold temperature and output hysteresis.

The thermostat can be configured to operate in either comparator or interrupt mode. In comparator mode, the thermostat output becomes active when the measured temperature exceeds the threshold value; it remains active until the temperature falls below the value stored in the hysteresis register. In interrupt mode, the thermostat output first becomes active when the measured temperature exceeds the threshold value; it can only be cleared either by putting the DS75LV into shutdown mode or by reading from any register (temperature, configuration, TOS, or THYST) on the device.

For power-sensitive applications, the device offers a low-power shutdown mode that reduces current draw to less than 2A. Communication with the new temperature-sensor is achieved through a standard two-wire (I2C) serial interface. If the device's bus-timeout function is held longer than a predetermined amount of time, it releases the data line. This prevents any possible lockup problems that could occur on the two-wire bus. The device is available in an 8-pin SO or microSOP (microMAX) lead-free package.

Typical applications for the product include portable temperature loggers, portable medical equipment, networking equipment, servers and computers, test equipment, and any low-voltage, thermally-sensitive system. Prices start at 90 cents for quantities of 1,000.




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