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Temp sensor with EEPROM touts .5C accuracy

Posted: 28 Jul 2008 ?? ?Print Version ?Bookmark and Share

Keywords:thermostat? temperature sensor? EEPROM?


Maxim Integrated Products has developed the DS7505 0.5C accurate, digital temperature sensor and thermostat with non-volatile memory (EEPROM).

The integration of non-volatile EEPROM enables the 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 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 designed for applications that require high-accuracy temperature sensing, such as base station, telecom, networking and medical systems.

The DS7505 is factory calibrated to provide 0.5C accuracy over its entire supply-voltage range and a wide 0C to +70C temperature range. It is 2.0C (max) accurate over its full, -55C to 125C operating-temperature range. Thermometer resolution is reported as user-selectable 9-, 10-, 11-, or 12bit digital readings that translate to temperature increments between 0.5C (9bit) and 0.0625C (12bit).

To enhance further flexibility, the DS7505's user-defined configuration options include active or standby state, conversion resolution, thermostat mode, output polarity, and fault tolerance. Additionally, the non-volatile thermostat and configuration registers allow the device to power-up and operate as a stand-alone thermostat with no need to communicate with a MCU.

The DS7505 operates from a low, 1.7V to 3.7V supply voltage and can 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 (I?C) serial interface.

The DS7505 is available in a lead-free, 8-pin SO package; an 8-pin ?SOP (?MAX) package with an exposed pad is available as demand warrants. Prices start at $1.40 (1000-up, FOB USA).

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