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Digital temperature sensor and thermostat

Electronics News
14 years ago

Digital temperature sensor and thermostat

Maxim Integrated Products introduces the DS7505 ±0.5°C accurate, digital temperature sensor and thermostat with nonvolatile memory (EEPROM). The integration of nonvolatile EEPROM enables this device to power-up with a user-defined configuration and thermostat thresholds, whereas other similar devices store threshold and configuration data in volatile memory and, therefore, can only power-up in the factory-defined state. Software and pin compatible with the industry-standard LM75 and Maxim's DS75, the DS7505 is ideal for applications that require high-accuracy temperature sensing, such as base-station, telecom, networking, and medical systems.

 The DS7505 is factory calibrated to provide ±0.5°C accuracy over its entire supply-voltage range and a wide, 0°C to +70°C temperature range. It is ±2.0°C (max) accurate over its full, -55°C to +125°C operating-temperature range. Thermometer resolution is reported as user-selectable 9-, 10-, 11-, or 12-bit digital readings that translate to temperature increments between 0.5°C (9 bit) and 0.0625°C (12 bit). To further enhance flexibility, the DS7505's user-defined configuration options include active or standby state, conversion resolution, thermostat mode, output polarity, and fault tolerance. Additionally, the nonvolatile thermostat and configuration registers allow the device to power-up and operate as a stand-alone thermostat with no need to communicate with a microcontroller.

 The DS7505 operates from a low, 1.7V to 3.7V supply voltage and can, therefore, be connected directly to low-voltage supply rails. Because the device is function, pin, and software compatible with the popular LM75/DS75, it is easy to migrate to low-voltage and/or higher-precision designs using the DS7505. Communication with the DS7505 is achieved through a standard 2-wire (I²C) serial interface. The DS7505 is available in a lead-free, 8-pin SO package; an 8-pin µSOP (µMAX®) package with an exposed pad is available as demand warrants. Prices start at $1.40 (1000-up, FOB USA).

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