The DS1825U+T&R is a programmable resolution 1-wire digital thermometer with 4bit ID in 8 pin µMAX package. It provides 9bit to 12bit centigrade temperature measurements and has an alarm function with NV user programmable upper and lower trigger points. The DS1825 communicates over 1-wire bus that by definition requires only one data line (and ground) for communication with central microprocessor. It has an operating temperature range of -55°C to +125°C (2°C accuracy) and is accurate to ±0.5°C over the range of -10°C to +85°C. In addition, the DS1825 can derive power directly from the data line (parasite power) by eliminating the need for an external power supply. Each DS1825 has a unique 64bit serial code which allows multiple DS1825 devices to function on same 1-wire bus thus it is simple to use one microprocessor to control many DS1825s distributed over a large area.

• Supply voltage range from 3V to 3.7V
• Unique 1-wire interface requires only one port pin for communication
• Multidrop capability simplifies distributed temperature sensing applications
• 4 pin programmable bits to uniquely identify up to 16 sensor locations on bus
• Requires no external components
• Converts temperature to 12bit digital word in 750ms (maximum)
• User definable (NV) alarm settings
• Alarm search command identifies & addresses devices whose temperature is outside programmed limits
• Standby current of 500nA, active current of 0.65mA and sink current of 4mA
• 2ms NV write cycle time, 50K EEPROM writes and 10 years EEPROM data retention (-55°C to +55°C)

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