FIRST FULL-VOLTAGE RANGE, HIGH-RESOLUTION DIGITAL TEMPERATURE SENSOR IN A SOT23 PACKAGE FROM DALLAS SEMICONDUCTOR
DALLAS, TEXAS-April 20, 1999-Dallas Semiconductor today announced the new DS1775 Digital Thermometer and Thermostat, the only digital sensor in minimalist SOT-23 packaging that can maintain an accuracy of ±2°C throughout the 3V to 5V power range. Readouts are adjustable from 9 to 12 bits of resolution. By combining economies of scale and cost without sacrificing digital accuracy and flexibility, the DS1775 provides premium thermal management in space- and weight-constrained applications.
 Temperature changes affect the operation of many kinds of electronic equipment, from PCs to cellular telephones. The DS1775 indicates the device's temperature over a range of -55°C to +125°C. Its five major components automate thermal control: a digital temperature sensor, analog-to-digital converter, data registers, thermostatic comparator, and 2-wire system interface.
Product manager Chris Beaudoin said, "Package size affects how quickly a thermometer reflects changes in ambient temperature. The DS1775 SOT-23 offers digital readout and control with the quick responsiveness and space savings of a thermistor. In this minimal package, the DS1775 is unique among digital sensors in maintaining ±2°C accuracy over the entire 2.7V to 5.5V supply range. At the same time, it offers the flexibility that designers expect in larger devices."
The DS1775 communicates via a popular 2-wire serial interface. The user can choose from a range of readout increments, from the default of 0.5°C (9-bit conversions) to 0.0625°C (12 bits). The finest readouts are used in applications where very small temperature changes are critical and require immediate response, such as biomedical diagnostics. Once thermostatic setpoints are established, the user can configure either an interrupt or comparator mode to customize the method of clearing a fault condition. In power-sensitive applications, the DS1775 can assume a low-power, standby mode.
Applications for the DS1775 include disk drives in PCs, servers, and workstations, environmental and biomedical diagnostic equipment, handheld instruments such as cellular telephones, or any thermally sensitive, electronically controlled system. Firmware-compatible with the industry-standard XX75, the DS1775 can be a drop-in replacement where cost, weight and space savings are significant.
Eight versions of the DS1775 supply device addressability options. Custom addresses can be laser defined at the factory for multi-drop capability. The DS1775 is sampling now, priced at $0.80 in quantities of 1,000. Production quantities will be available Q2.
Dallas Semiconductor designs, manufactures and markets CMOS chips and chip-based subsystems. In its 15-year history, the company has sold its products to more than 15,000 customers worldwide. Major markets include Original Equipment Manufacturers (OEMs) in personal computers, telecommunications, office equipment, instrumentation, factory automation, medical equipment and mainframe computers.
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