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)
(EN)
