Digital Temperature Sensor Handles Up To 27 I²C Addresses

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 V_DD, or left floating. This compares to similar devices that only allow the three address pins to be tied to GND or V_DD, 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.