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Dallas Semi digital temp-sensor operates on low voltage

Posted: 24 May 2006     Print Version  Bookmark and Share

Keywords:Dallas Semi  DS75LV  temperature  sensor 

Dallas Semiconductor has introduced a digital temperature-sensor, which is said to operate over a 1.7V to 3.7V supply-voltage range. The sensor is called the DS75LV and suits low-power, battery-operated systems and the systems which use low supply-voltage rails.

The product provides user-selectable 9-/10-/11-/12bit digital temperature readings that translate to resolutions between 0.5°C (9bit) and 0.0625°C (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.

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

For power-sensitive applications, the device offers a low-power shutdown mode that reduces current draw to less than 2μA. Communication with the 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 Rs.40.60 (90 cents) for quantities of 1,000.

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