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Temp sensor enables 27 addresses on an I?C bus

Posted: 28 May 2007 ?? ?Print Version ?Bookmark and Share

Keywords:digital temperature sensor? 27 addresses? I2C bus?

Maxim's DS75LX digital temperature sensor

Maxim Integrated Products has introduced the low-voltage DS75LX, a digital temperature sensor that allows up to 27 addresses on one I?C communication bus. Function, pin and software compatible with the DS75, the DS75LX makes it easy to migrate to low-voltage designs.

To enable 27 address combinations, the DS75LX temperature sensor provides three dedicated address pins that can be placed in one of three states: tied to GND, tied to VDD or left floating. Most competing devices only allow the three address pins to be tied to GND or VDD, resulting in a maximum of only eight addresses. The DS75LX's additional addresses simplify applications in which several I?C components reside, thus making it suitable for base stations, networking and telecom equipment, and other distributed temperature-sensing systems, said Maxim.

The DS75LX operates from a low 1.7V to 3.7V supply voltage, and it can be connected directly to low-voltage supply rails. The temperature sensor is factory calibrated to an accuracy of 2C (max) over its entire supply voltage range and a wide temperature range of -25C to 100C. It is 3;2C (max) accurate over its full operating temperature range of -55C to 125C.

Temperature is reported as user-selectable 9-, 10-, 11- or 12bit digital temperature readings that translate to resolutions between 0.5;2C (9 bit) and 0.0625;2C (12 bit). DS75LX also has thermostat functionality with user-defined trip points that allow the user to customize the threshold temperature and output hysteresis. The part includes an optional bus-timeout function that releases the data line if held longer than a predetermined amount of time. This prevents any possible lockup problems that might occur on the two-wire bus, said Maxim. It is available in both lead-free, 8-pin microSOP (microMAX) and 8-pin SO packages.

Pricing starts at 75 cents for 1000-unit quantities (FOB USA).

- Gina Roos

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