Digital Temperature Sensor Handles Up To 27 I²C Addresses

June 11, 2007
The DS75LX temperature sensor from Maxim Integrated Products is factory-calibrated to ±2°C over its entire supply voltage range.

A digital temperature sensor from Maxim Integrated Products, the DS75LX, allows up to 27 addresses on one I²C communication bus, while making it easy to migrate to low-voltage (1.7 to 3.7 V) designs. To enable 27 address combinations, the DS75LX provides three dedicated address pins that can be placed in one of three states: tied to GND, tied to VDD, or left floating. This compares to similar devices that only allow the three address pins to be tied to GND or VDD, resulting in only eight addresses. The additional addresses simplify applications in which several I²C components reside, making the sensor well-suited for basestations, networking and telecom equipment, and other distributed temperature-sensing systems.

The sensor is factory-calibrated to ±2.0°C (max) over its entire operating voltage range and a wide −25°C to 100°C temperature range. Over its full operating range of −55°C to 125°C, accuracy is ±3.0°C (max). Users can select 9-, 10-, 11-, or 12-bit digital temperature readings that translate to resolutions between 0.5°C to 0.0625°C. The device also has a thermostat function with user-defined trip points. Additionally, an optional bus-timeout function releases the data line if it’s held longer than a predetermined period. This prevents any possible lockup problems on the two-wire bus. The DS75LX is available in both lead-free 8-pin microSOP (microMAX) and 8-pin SO packages.

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Prices start at $0.75 in quantities of 1000 and up. FOR MORE INFORMATION


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